ch23 _Technical_Considerations_DECK Flashcards by R

Which of the following BEST describes digital exposure considerations?
a. Traditional radiographic principles no longer apply
b. Only software determines image quality
c. Traditional parameters still apply in digital imaging
d. Exposure factors are irrelevant

c. Traditional parameters still apply in digital imaging

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Which factor is MOST directly related to distance and intensity changes in digital imaging?
a. Inverse square law
b. Grid ratio
c. Filtration
d. Collimation

a. Inverse square law

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Which exposure factor improves spatial resolution when decreased?
a. SID
b. OID
c. mAs
d. Filtration

b. OID

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Which of the following is TRUE regarding focal spot size?
a. Larger focal spot improves resolution
b. Smaller focal spot improves resolution
c. Focal spot size does not affect image quality
d. Focal spot only affects brightness

b. Smaller focal spot improves resolution

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Which factor primarily controls beam penetration in digital imaging?
a. mAs
b. SID
c. kVp
d. Grid

c. kVp

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What is the PRIMARY role of mAs in digital imaging?
a. Controls contrast
b. Controls brightness only
c. Controls quantity of radiation (detector exposure)
d. Controls spatial resolution

c. Controls quantity of radiation (detector exposure)

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Why are high mA and short exposure times preferred?
a. Increase contrast
b. Reduce motion blur
c. Increase noise
d. Reduce penetration

b. Reduce motion blur

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What is the MAIN purpose of collimation?
a. Increase brightness
b. Reduce scatter and patient dose
c. Increase magnification
d. Improve focal spot size

b. Reduce scatter and patient dose

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What is the PRIMARY benefit of using grids?
a. Increase noise
b. Reduce scatter radiation
c. Increase magnification
d. Decrease resolution

b. Reduce scatter radiation

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What is the PURPOSE of filtration in radiography?
a. Increase low-energy photons
b. Remove low-energy photons
c. Increase image noise
d. Increase patient dose

b. Remove low-energy photons

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Which patient factor MOST affects exposure selection?
a. Hair color
b. Patient size and condition
c. Age only
d. Gender

b. Patient size and condition

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Which of the following improves radiographic spatial resolution in DR?
a. Decreasing SID
b. Increasing SID
c. Increasing OID
d. Increasing filtration

b. Increasing SID

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What happens to spatial resolution when SID is increased?
a. Decreases due to magnification
b. No change
c. Improves due to reduced magnification
d. Increases noise

c. Improves due to reduced magnification

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Which focal spot size provides the BEST spatial resolution?
a. Large focal spot
b. Medium focal spot
c. Small focal spot
d. Focal spot size does not matter

c. Small focal spot

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Why does a smaller focal spot improve resolution?
a. Increases beam intensity
b. Reduces penumbra
c. Increases scatter
d. Decreases exposure time

b. Reduces penumbra

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What is the PRIMARY benefit of using high mA with short exposure time?
a. Increases contrast
b. Reduces motion blur
c. Increases magnification
d. Reduces penetration

b. Reduces motion blur

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Which of the following combinations BEST improves image sharpness?
a. Low mA, long time
b. High mA, long time
c. High mA, short time
d. Low mA, short time

c. High mA, short time

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What is the effect of motion on radiographic images?
a. Increases contrast
b. Improves resolution
c. Causes image blur
d. Reduces noise

c. Causes image blur

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Which factor is MOST responsible for geometric sharpness?
a. kVp
b. mAs
c. Focal spot size
d. Filtration

c. Focal spot size

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What happens to image sharpness when OID increases?
a. Improves resolution
b. No change
c. Decreases resolution due to magnification
d. Reduces noise

c. Decreases resolution due to magnification

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In digital imaging, what is the relationship between kVp and contrast?
a. kVp directly controls contrast like film-screen
b. kVp has no effect on the image
c. kVp only controls brightness
d. kVp does not control contrast in the traditional sense

d. kVp does not control contrast in the traditional sense

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In digital radiography, what primarily determines image brightness?
a. mAs
b. kVp
c. Distance
d. Post-processing (LUT)

d. Post-processing (LUT)

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Why are traditional mAs and image density relationships no longer valid in digital imaging?
a. mAs no longer affects exposure
b. Density is controlled by software processing
c. mAs only affects contrast now
d. mAs is replaced by kVp

b. Density is controlled by software processing

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What does the detector convert x-ray exposure into in digital imaging?
a. Heat
b. Light only
c. Electronic signal
d. Magnetic field

c. Electronic signal

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What is the MOST important factor for digital image quality? a. kVp selection only b. mAs selection only c. Total exposure to the detector d. Focal spot size

c. Total exposure to the detector

Which statement is TRUE about mAs in digital imaging? a. It controls brightness directly b. It has no role in image quality c. It controls the quantity of photons reaching the detector d. It only affects contrast

c. It controls the quantity of photons reaching the detector

What happens when exposure to the detector is too low? a. Image becomes too bright b. Image becomes noisy (quantum mottle) c. Image contrast increases d. Detector saturation occurs

b. Image becomes noisy (quantum mottle)

What happens when exposure to the detector is excessively high? a. Increased noise b. Reduced signal c. No effect at all d. Increased patient dose without improving diagnostic quality

d. Increased patient dose without improving diagnostic quality

Which statement BEST describes digital contrast? a. Controlled primarily by kVp b. Controlled primarily by mAs c. Controlled primarily by post-processing algorithms d. Controlled by SID

c. Controlled primarily by post-processing algorithms

In digital imaging, how does kVp selection typically compare to analog imaging? a. Lower kVp is used b. Higher kVp is used c. kVp is eliminated d. kVp only affects brightness

b. Higher kVp is used

What is the primary benefit of using higher kVp in digital imaging? a. Reduces ESE b. Increases image noise c. Decreases penetration d. Increases patient dose

a. Reduces entrance skin exposure (ESE)

What does the 15% rule state? a. Increase kVp by 15% → double mAs b. Increase kVp by 15% → halve mAs c. Decrease kVp by 15% → halve mAs d. kVp and mAs are unrelated

b. Increase kVp by 15% → halve mAs

What happens when mAs is too low in digital imaging? a. Image becomes too bright b. Contrast increases c. Quantum mottle (noise) increases d. Detector saturation occurs

c. Quantum mottle (noise) increases

What is the MAIN cause of quantum mottle? a. Excessive kVp b. Insufficient photon quantity c. Excessive filtration d. High SID

b. Insufficient photon quantity

What is the MOST important factor in digital image quality? a. kVp selection b. Focal spot size c. SID d. Total exposure to the detector

d. Total exposure to the detector

Why can digital imaging tolerate higher kVp techniques? a. kVp controls brightness b. Software compensates for contrast changes c. kVp has no effect on the image d. mAs becomes irrelevant

b. Software compensates for contrast changes

What happens if exposure to the detector is adequate but kVp is high? a. Image will always be too dark b. Image will have no signal c. Image can still appear acceptable due to processing d. Image will always have high contrast

c. Image can still appear acceptable due to processing

What is the effect of image noise on diagnostic quality? a. Improves diagnostic acuity b. Has no effect on diagnosis c. Impairs diagnostic acuity d. Only affects brightness

c. Impairs diagnostic acuity

How is quantum noise primarily controlled in digital imaging? a. Adjusting SID b. Modifying mAs c. Changing focal spot size d. Using filtration

b. Modifying mAs

What happens to image noise when mAs is increased? a. Noise increases b. Noise decreases c. No change in noise d. Contrast decreases

b. Noise decreases

What is the result of using excessively high mAs? a. Photon starvation b. Increased noise c. Reduced signal d. Detector element (DEL) saturation

d. Detector element (DEL) saturation

What artifact can result from detector saturation? a. Grid cutoff b. Motion blur c. Data drop d. Fogging

c. Data drop

What does 'data drop' refer to? a. Loss of image brightness b. Loss of signal due to underexposure c. Detector overwhelmed and unable to record data d. Increase in scatter radiation

c. Detector overwhelmed and unable to record data

What is the purpose of exposure indicators (EI)? a. Measure patient size b. Control image contrast c. Assess detector exposure and image quality d. Adjust focal spot size

c. Assess detector exposure and image quality

What is the relationship between mAs and image signal? a. mAs decreases signal b. mAs has no effect on signal c. mAs only affects contrast d. Higher mAs increases signal

d. Higher mAs increases signal

Why are exposure technique systems still important in digital imaging? a. They control image brightness directly b. They eliminate the need for EI values c. They ensure consistent exposure and image quality d. They replace post-processing

c. They ensure consistent exposure and image quality

What is image quality primarily referenced to in digital imaging? a. kVp b. Exposure Indicator (EI) c. SID d. Focal spot size

b. Exposure Indicator (EI)

Why can exposure indicator (EI) values be confusing in clinical practice? a. EI only measures contrast b. EI values change with SID c. EI is not used in digital imaging d. Different manufacturers use different EI scales

d. Different manufacturers use different EI scales

What must departments provide to ensure proper exposure technique? a. Only kVp charts b. Only mAs charts c. Exposure technique charts and target EI values d. Only post-processing software

c. Exposure technique charts and target EI values

What do target EI values represent? a. Maximum allowable patient dose b. Standard of acceptable detector exposure c. Image brightness level d. Focal spot size standard

b. Standard of acceptable detector exposure

Who originally developed exposure technique systems in the 1920s? a. Arthur W. Fuchs b. Wilhelm Roentgen c. Ed. C. Jerman d. Marie Curie

c. Ed. C. Jerman

Who refined exposure technique systems into a scientific method? a. Ed. C. Jerman b. Arthur W. Fuchs c. Thomas Edison d. Isaac Newton

b. Arthur W. Fuchs

What are the two main exposure technique systems? a. High kVp and low kVp systems b. Analog and digital systems c. Fixed kVp/variable mAs and variable kVp/fixed mAs d. Manual and automatic systems

c. Fixed kVp/variable mAs and variable kVp/fixed mAs

Which exposure technique system is BEST suited for digital imaging? a. Variable kVp, fixed mAs b. Fixed kVp, variable mAs c. Fixed mAs only d. Variable SID system

b. Fixed kVp, variable mAs

What is the defining feature of a fixed kVp system? a. kVp remains constant while mAs is adjusted b. mAs remains constant while kVp is adjusted c. Both kVp and mAs remain constant d. Neither kVp nor mAs are controlled

a. kVp remains constant while mAs is adjusted

What must be established first in a fixed kVp system? a. Patient weight b. Optimal kVp for the body part c. SID d. Grid ratio

b. Optimal kVp for the body part

What is the purpose of selecting an optimal kVp? a. Control image brightness b. Reduce exposure time c. Ensure desired image contrast d. Eliminate scatter

c. Ensure desired image contrast

In a fixed kVp system, what parameter is adjusted for patient thickness? a. kVp b. SID c. Focal spot size d. mAs

d. mAs

What is the minimum percentage change in mAs considered significant? a. 10% b. 15% c. 30% d. 50%

c. 30%

In a fixed kVp system, how is mAs adjusted for every 5 cm increase in patient thickness? a. Decrease mAs by half b. Double mAs c. Increase kVp d. No change

b. Double mAs

In a fixed kVp system, how is mAs adjusted for every 5 cm decrease in thickness? a. Double mAs b. Increase kVp c. Reduce SID d. Halve mAs

d. Halve mAs

Why are mAs changes less than 30% typically avoided? a. They significantly increase dose b. They do not produce noticeable changes in exposure c. They affect contrast too much d. They increase noise dramatically

b. They do not produce noticeable changes in exposure

What is the defining feature of a variable kVp system? a. kVp is adjusted based on patient thickness b. mAs remains constant at all times c. Both kVp and mAs remain constant d. Only SID is adjusted

a. kVp is adjusted based on patient thickness

What is the typical threshold kVp used in a variable kVp system? a. 15 kVp b. 30 kVp c. 60 kVp d. 90 kVp

b. 30 kVp

In a variable kVp system, how often is kVp adjusted based on thickness? a. Every 1 cm b. Every 5 cm c. Every 2 cm d. Every 10 cm

c. Every 2 cm

What is the correct formula used to calculate new kVp in this system? a. (2 × part cm) + 30 kVp b. (5 × part cm) + 15 kVp c. (2 × part cm) − 30 kVp d. (30 × part cm) + 2 kVp

a. (2 × part cm) + 30 kVp

Which exposure rule is applied when using the variable kVp system? a. Inverse square law b. 30% rule c. 5 cm rule d. 15% rule

d. 15% rule

Why is a threshold kVp required in this system? a. To determine starting contrast level b. To eliminate scatter radiation c. To reduce exposure time d. To fix mAs values

a. To determine starting contrast level

If a body part measures 10 cm, what is the calculated kVp using this system? a. 20 kVp b. 30 kVp c. 50 kVp d. 70 kVp

c. 50 kVp

What happens to kVp as part thickness increases in this system? a. It decreases b. It stays constant c. It increases d. It becomes irrelevant

c. It increases

What is the first step in establishing a technique system? a. Place chart into clinical trial b. Test exposures using a phantom c. Create exposure chart d. Re-examine chart

b. Test exposures using a phantom

Who is consulted to determine acceptability of test exposures? a. Patient b. Radiologic technologist and/or radiologist c. Nurse d. Physicist only

b. Radiologic technologist and/or radiologist

What is created after initial phantom testing? a. Final exposure chart b. Clinical trial report c. Theoretical exposure chart d. Exposure index log

c. Theoretical exposure chart

What is the purpose of using a range of large and small sizes when creating a chart? a. Reduce radiation dose b. Improve positioning accuracy c. Standardize SID d. Account for patient variability

d. Account for patient variability

What is done after the theoretical exposure chart is created? a. Re-examine for accuracy b. Adjust exposure index c. Place chart into clinical trial d. Discard incorrect data

c. Place chart into clinical trial

What is the purpose of clinical fine tuning? a. Adjust chart using real patient images and measurements b. Eliminate need for exposure charts c. Fix kVp permanently d. Reduce grid usage

a. Adjust chart using real patient images and measurements

What is the final step in establishing a technique system? a. Clinical trial b. Phantom testing c. Re-examining and adjusting over time d. Creating theoretical chart

c. Re-examining and adjusting over time

What is the primary factor used to judge image acceptability? a. Contrast b. Brightness c. Spatial resolution d. Image noise

d. Image noise

What is used as a reference point for evaluating exposures? a. SID b. Exposure Index (EI) c. kVp chart d. Grid ratio

b. Exposure Index (EI)

What is the relationship between image noise and exposure? a. Inversely related b. Directly related c. Not related d. Only related in CR

a. Inversely related

Why is digital imaging more tolerant of overexposure? a. Increased contrast resolution b. Use of grids c. Digital post-processing software d. Lower kVp settings

c. Digital post-processing software

What happens with underexposure in digital imaging? a. Increased exposure latitude b. Decreased exposure latitude c. No change in image quality d. Increased brightness

b. Decreased exposure latitude

What is 'dose creep'? a. Decreasing patient dose over time b. Increasing kVp for better contrast c. Gradual increase in exposure due to reliance on post-processing d. Reducing mAs to minimum levels

c. Gradual increase in exposure due to reliance on post-processing

What primarily causes dose creep? a. Fear of underexposure and reliance on rescaling b. Incorrect SID c. Low grid ratios d. Poor positioning

a. Fear of underexposure and reliance on rescaling

What is the recommended exposure technique approach in digital imaging? a. Low kVp and high mAs b. High kVp and low mAs c. Low kVp and low mAs d. High kVp and high mAs

b. High kVp and low mAs

Why is underexposure more problematic than overexposure in digital imaging? a. It increases patient dose b. It reduces contrast c. It causes increased image noise d. It affects positioning

c. It causes increased image noise

What does increasing exposure generally do to image noise? a. Increases noise b. Decreases noise c. Has no effect d. Only affects brightness

b. Decreases noise

What is ALARA compliance primarily based on in digital radiography? a. kVp selection b. Target Exposure Index (EIₜ) values c. SID adjustments d. Grid usage

b. Target Exposure Index (EIₜ) values

What is the purpose of using accurate exposure techniques based on patient measurement? a. Reduce positioning time b. Improve image brightness c. Optimize radiation dose and image quality d. Eliminate need for EI

c. Optimize radiation dose and image quality

Who is responsible for establishing target EI values? a. Radiologist only b. Equipment manufacturer c. Individual technologist d. Department

d. Department

What is the Deviation Index (DI) based on? a. kVp settings b. Target Exposure Index (EIₜ) c. Patient size d. SID

b. Target Exposure Index (EIₜ)

Where can EI and DI values typically be found? a. On the control panel only b. In the PACS image annotation only c. In the DICOM header of the image d. In the exposure chart

c. In the DICOM header of the image

What does a Deviation Index (DI) represent? a. Patient positioning accuracy b. Difference between actual EI and target EI c. Image contrast level d. Amount of scatter radiation

b. Difference between actual EI and target EI

Why is ALARA important in digital imaging? a. To increase image brightness b. To reduce radiation dose while maintaining image quality c. To eliminate need for technique charts d. To standardize SID

b. To reduce radiation dose while maintaining image quality

What is the main role of Exposure Index (EI)? a. Measure image contrast b. Indicate patient dose level at detector c. Control kVp automatically d. Replace mAs settings

b. Indicate patient dose level at detector

Who created the Deviation Index (DI)? a. ASRT b. FDA c. AAPM d. ARRT

c. AAPM

What does the Deviation Index (DI) establish? a. Patient positioning accuracy b. Range of EI variances based on target EI c. Image contrast level d. Exposure time

b. Range of EI variances based on target EI

What does a positive DI value indicate? a. Underexposure b. Proper exposure c. Equipment error d. Overexposure

d. Overexposure

What does a negative DI value indicate? a. Overexposure b. Underexposure c. Correct exposure d. High contrast

b. Underexposure

What is the approximate DI scale range? a. ±5 b. ±10 c. ±25 d. ±50

c. ±25

At what DI value does exposure become a concern for ALARA? a. ±1 b. ±2 c. ±3 or greater d. ±5

c. ±3 or greater

What does a DI of 0 represent? a. Severe overexposure b. Severe underexposure c. Target exposure achieved d. Equipment malfunction

c. Target exposure achieved

Why was the DI scale standardized? a. To eliminate exposure charts b. To account for manufacturer differences in EI calculations c. To control SID automatically d. To reduce scan time

b. To account for manufacturer differences in EI calculations

What are the primary factors that determine image quality in DR? a. kVp and SID only b. Noise, artifacts, resolution, and DQE c. mAs and grid ratio only d. Exposure time and focal spot size

b. Noise, artifacts, resolution, and DQE

What does DQE stand for? a. Digital Quality Enhancement b. Detector Quantum Energy c. Dose Quality Evaluation d. Detective Quantum Efficiency

d. Detective Quantum Efficiency

Scatter (secondary radiation) production is primarily affected by which factor? a. kVp b. SID c. mAs d. Grid frequency

c. mAs

What is photon starvation caused by? a. Overexposure b. Underexposure c. High kVp d. Large SID

b. Underexposure

What happens during photon starvation? a. Excess scatter is produced b. Image becomes overly bright c. Detector saturates d. Insufficient photons reach the detector

d. Insufficient photons reach the detector

What can extreme overexposure cause in DR systems? a. Increased noise b. Improved contrast c. Data drop due to DEL saturation d. Reduced resolution

c. Data drop due to DEL saturation

What is the main consequence of DEL saturation? a. Loss of image data b. Increased photon starvation c. Improved image detail d. Reduced exposure index

a. Loss of image data

Which factor is NOT listed as a primary determinant of DR image quality? a. Noise b. Artifacts c. Resolution d. Patient positioning

d. Patient positioning

When assessing DR image quality, what is meant by evaluating the image in 'totality'? a. Only checking exposure index b. Evaluating all image quality factors together c. Focusing only on anatomy d. Ignoring artifacts

b. Evaluating all image quality factors together

Which of the following is NOT part of assessing DR image quality? a. Collimation b. Motion distortion c. Patient billing information d. Resolution

c. Patient billing information

What does quantum noise (mottle) indicate? a. Excessive exposure b. Insufficient photon interaction c. High contrast d. Detector saturation

b. Insufficient photon interaction

Why is collimation important when assessing image quality? a. It increases brightness b. It improves patient comfort c. It reduces scatter and improves image quality d. It controls SID

c. It reduces scatter and improves image quality

What type of distortion is caused by patient movement? a. Geometric distortion b. Quantum mottle c. Motion distortion d. Contrast distortion

c. Motion distortion

What role does EI play in image assessment? a. Determines positioning accuracy b. Serves as a reference for exposure to the detector c. Controls contrast d. Eliminates artifacts

b. Serves as a reference for exposure to the detector

When should an image be sent for interpretation? a. When EI is high regardless of appearance b. When image looks good even if EI is off c. When both image appearance and EI are acceptable d. When artifacts are present

c. When both image appearance and EI are acceptable

Which factor ensures correct anatomy is included in the image? a. Resolution b. Positioning c. Brightness d. EI value

b. Positioning

What is electronic masking? a. A post-processing function that removes nonclinical image data b. A method of increasing kVp c. A positioning technique d. A type of detector

a. A post-processing function that removes nonclinical image data

What is another name for electronic masking? a. Windowing b. Cropping c. Rescaling d. Filtering

b. Cropping

Electronic masking can be performed in what way? a. Only manually b. Only automatically c. Either manually or automatically d. Only by the radiologist

c. Either manually or automatically

What is the main purpose of electronic masking? a. Increase spatial resolution b. Reduce patient dose c. Eliminate extraneous brightness at image edges d. Improve positioning accuracy

c. Eliminate extraneous brightness at image edges

What visual issue does electronic masking help reduce? a. Motion blur b. Veil glare c. Quantum mottle d. Scatter radiation

b. Veil glare

What type of data is removed by electronic masking? a. Clinical anatomy b. Exposure index data c. Nonclinical image data d. Resolution data

c. Nonclinical image data

What effect does electronic masking have on image resolution? a. Increases resolution b. Decreases resolution c. Eliminates resolution d. No impact on resolution

d. No impact on resolution

Which of the following is TRUE about electronic masking? a. It replaces collimation b. It physically reduces the x-ray beam c. It is performed after image acquisition d. It reduces scatter production

c. It is performed after image acquisition

Is electronic masking a substitute for collimation? a. Yes, it replaces collimation b. Only in digital systems c. No, it is not a substitute d. Only when using CR

c. No, it is not a substitute

What can electronic masking affect in older CR/DR systems? a. Image resolution b. Exposure Index (EI) accuracy c. Patient positioning d. Beam quality

b. Exposure Index (EI) accuracy

Why is masking potentially problematic for radiologists? a. It increases noise b. It reduces resolution c. It can hide incidental findings d. It changes contrast

c. It can hide incidental findings

What are incidental findings? a. Planned anatomy in the image b. Artifacts from motion c. Exposure errors d. Unexpected findings outside the main area of interest

d. Unexpected findings outside the main area of interest

According to ASRT, what should NOT be done with electronic masking? a. Use it automatically b. Adjust brightness c. Remove nonclinical data d. Crop out areas that were exposed and should be interpreted

d. Crop out areas that were exposed and should be interpreted

What is the main ethical concern with electronic masking? a. Increased patient dose b. Loss of diagnostic information c. Reduced image contrast d. Equipment damage

b. Loss of diagnostic information

Why should masking be used cautiously in digital imaging? a. It affects kVp b. It reduces mAs c. It can misrepresent the original exposure field d. It increases scatter

c. It can misrepresent the original exposure field

What is the ASRT stance on masking clinically relevant areas? a. It is recommended b. It is optional c. It depends on EI d. It should not be done

d. It should not be done

What are medical radiographs considered in healthcare? a. Educational tools b. Legal documents c. Temporary images d. Research material

b. Legal documents

Why are radiographs considered legal documents? a. They are used for billing b. They are easily editable c. They are part of the patient’s medical record d. They are only used for teaching

c. They are part of the patient’s medical record

What does a medical image represent? a. Only bone structures b. A pictorial record of anatomy and medical condition c. Only positioning accuracy d. Exposure technique

b. A pictorial record of anatomy and medical condition

What is meant by a radiograph being a 'pictorial record'? a. It replaces written documentation b. It visually represents the patient’s condition c. It improves resolution d. It reduces exposure time

b. It visually represents the patient’s condition

A radiographic image represents the patient at what point in time? a. Over several days b. A projected future condition c. A single moment in the patient’s medical timeline d. An average of multiple exposures

c. A single moment in the patient’s medical timeline

Why is it important that radiographs reflect a single moment in time? a. It allows editing later b. It ensures consistent brightness c. It captures a specific clinical condition at that time d. It reduces noise

c. It captures a specific clinical condition at that time

What implication does the 'legal document' concept have for technologists? a. Images can be altered freely b. Accuracy and integrity must be maintained c. Only radiologists are responsible d. Images can be deleted if unclear

b. Accuracy and integrity must be maintained

Which statement best describes a radiologic image? a. A flexible visual estimate b. A temporary diagnostic guess c. A fixed legal and clinical record of a moment in time d. A modifiable teaching tool

c. A fixed legal and clinical record of a moment in time

What determines the accuracy of medical image interpretation? a. Only radiologist experience b. Quality of the image created c. Patient condition d. Exposure time only

b. Quality of the image created

What components contribute to image quality optimization? a. Only technological components b. Only human components c. Both technological and human components d. Only equipment settings

c. Both technological and human components

What do radiologists expect regarding department procedures? a. They are optional b. They vary per patient c. They are ignored in emergencies d. They are followed consistently

d. They are followed consistently

What must be done if there is a variance from standard procedures? a. Ignore it b. Delete the image c. Explain it completely d. Repeat the exam immediately

c. Explain it completely

What assumption do radiologists make about how images are produced? a. They are produced quickly b. They follow manufacturer settings c. They are ALARA-compliant d. They use high mAs

c. They are ALARA-compliant

What is the technologist’s responsibility in image creation? a. Only positioning the patient b. Ensuring optimal image quality and adherence to protocols c. Adjusting brightness only d. Recording patient history

b. Ensuring optimal image quality and adherence to protocols

Why is adherence to department routines important? a. It reduces scan time b. It ensures consistency and reliability of images c. It increases brightness d. It eliminates noise

b. It ensures consistency and reliability of images

What happens if image quality is poor? a. Radiologist compensates easily b. Interpretation accuracy decreases c. It has no effect d. It improves contrast

b. Interpretation accuracy decreases

What is the purpose of electronic annotation? a. To replace lead markers b. To indicate image acquisition conditions c. To reduce exposure d. To improve resolution

b. To indicate image acquisition conditions

Which of the following is an example of information added by electronic annotation? a. kVp and mAs b. SID c. Upright or decubitus position d. Grid ratio

c. Upright or decubitus position

Can electronic annotation replace lead markers for laterality (Lt/Rt)? a. Yes, always b. Only in digital systems c. Only if approved by radiologist d. No, absolutely not

d. No, absolutely not

What is the main advantage of electronic annotation? a. Improves contrast b. Reduces noise c. Convenient and easy to apply (cut and paste) d. Eliminates artifacts

c. Convenient and easy to apply (cut and paste)

Why is electronic annotation valuable to radiologists? a. It increases resolution b. It provides acquisition details c. It reduces scan time d. It replaces exposure charts

b. It provides acquisition details

According to ASRT best practice, how should laterality be indicated? a. Electronically after exposure b. With written notes c. Using lead markers at time of exposure d. Using PACS tools

c. Using lead markers at time of exposure

What is the key limitation of electronic annotation? a. It cannot be edited b. It cannot improve brightness c. It cannot indicate exposure factors d. It cannot replace anatomical side markers

d. It cannot replace anatomical side markers

Why must lead markers be placed during exposure? a. To improve resolution b. To reduce scatter c. To ensure permanent and legal identification of laterality d. To adjust brightness

c. To ensure permanent and legal identification of laterality

What are image artifacts in digital radiography? a. Extraneous information that does not represent the patient b. Improved image features c. Increased resolution areas d. Normal anatomical variations

a. Extraneous information that does not represent the patient

What is diagnostic yield? a. The amount of useful diagnostic information obtained b. The exposure index value c. The level of scatter radiation d. The image brightness

a. The amount of useful diagnostic information obtained

What does diagnostic efficacy refer to? a. Image fidelity (accuracy of representation) b. Exposure time c. Patient positioning d. SID adjustments

a. Image fidelity (accuracy of representation)

What does LCR stand for in image quality? a. Low-contrast resolution b. Linear contrast ratio c. Light capture rate d. Level contrast range

a. Low-contrast resolution

What happens to diagnostic yield between different imaging modalities? a. It remains constant b. It varies between modalities c. It only depends on kVp d. It is unrelated to imaging

b. It varies between modalities

Are artifacts avoidable in medical imaging? a. Yes, always b. No, they are a known fact of image production c. Only in DR systems d. Only with high kVp

b. No, they are a known fact of image production

Why are artifacts important to recognize? a. They improve contrast b. They may mimic or obscure pathology c. They reduce exposure time d. They increase resolution

b. They may mimic or obscure pathology

What is the main issue with artifacts in an image? a. They enhance diagnostic value b. They increase brightness c. They misrepresent the patient’s condition d. They reduce scan time

c. They misrepresent the patient’s condition

Why do digital detectors produce more gray shades? a. Wider dynamic range of photon energies b. Lower kVp settings c. Increased SID d. Reduced mAs

a. Wider dynamic range of photon energies

What property of digital detectors contributes to subtle gray tones? a. Spectral response b. Grid ratio c. Focal spot size d. Collimation

a. Spectral response

What is the result of increased gray shades in DR images? a. More subtle differences in tissue contrast b. Increased motion blur c. Reduced image brightness d. Increased artifacts only

a. More subtle differences in tissue contrast

Which of the following can create artifacts on DR images? a. Clothing and hair braids b. kVp settings c. SID changes d. Exposure index

a. Clothing and hair braids

Why are artifacts like sheets or positioning aids important to recognize? a. They may appear as pathology b. They improve contrast c. They reduce noise d. They increase resolution

a. They may appear as pathology

What should be done if unexpected findings appear on an image? a. Ignore them b. Repeat exposure immediately c. Explain them to the radiologist d. Delete the image

c. Explain them to the radiologist

What is one disadvantage of the wide dynamic range in DR systems? a. Increased chance of subtle artifacts being visible b. Reduced image detail c. Increased patient dose always d. Decreased resolution

a. Increased chance of subtle artifacts being visible

What is low-contrast resolution (LCR) primarily associated with? a. Ability to distinguish subtle differences in gray shades b. Ability to see edges sharply c. Patient positioning accuracy d. Exposure time

a. Ability to distinguish subtle differences in gray shades

What is the primary cause of data drop artifacts in DR? a. DEL saturation due to excessive exposure b. Underexposure c. Motion distortion d. Poor collimation

a. DEL saturation due to excessive exposure

What is the main effect of a data drop artifact? a. Increased resolution b. Misrepresentation of patient information c. Reduced noise d. Improved contrast

b. Misrepresentation of patient information

Which condition leads to DEL saturation? a. Low kVp b. Insufficient exposure c. Excessive exposure d. Large SID

c. Excessive exposure

What is one post-processing method used to correct data drop artifacts? a. Histogram analysis b. Pixel recovery c. Window leveling d. Annotation

b. Pixel recovery

Which of the following is a physical method to reduce data drop artifacts? a. Electronic masking b. Increasing SID c. Collimation d. Reducing grid ratio

c. Collimation

What is tissue bolusing used for in data drop correction? a. Increase exposure to underexposed areas b. Reduce motion c. Improve resolution d. Eliminate scatter

a. Increase exposure to underexposed areas

Which method should NOT be used to correct data drop artifacts? a. Masking b. Collimation c. Filtration d. Pixel recovery

a. Masking

What is the purpose of compensating filtration? a. Equalize exposure across the image b. Increase noise c. Reduce brightness only d. Improve positioning

a. Equalize exposure across the image

What is a 'ghosting' or 'phantom image' artifact? a. A residual image from a previous exposure b. Motion blur from patient movement c. Scatter radiation pattern d. Low contrast resolution

a. A residual image from a previous exposure

What typically causes scratches or tears artifacts? a. Damaged imaging plate or detector surface b. Incorrect kVp c. High SID d. Patient motion

a. Damaged imaging plate or detector surface

What do opaque spots on an image usually indicate? a. Dirt or debris on the detector b. Overexposure c. Motion artifact d. High contrast

a. Dirt or debris on the detector

What causes white lines on a digital image? a. Detector or reader malfunction b. Low mAs c. Increased SID d. Patient positioning error

a. Detector or reader malfunction

What are light spots on an image most often caused by? a. Dust or contamination on the system b. Excessive kVp c. Motion distortion d. Collimation error

a. Dust or contamination on the system

What does 'drop out' refer to in digital artifacts? a. Loss of signal in part of the image b. Increased brightness c. Improved resolution d. Reduced noise

a. Loss of signal in part of the image

What is backscatter fogging caused by? a. Radiation scattering back to the detector b. Low exposure c. High grid ratio d. Patient movement

a. Radiation scattering back to the detector

What are CR transport artifacts associated with? a. Issues in the plate handling system b. Incorrect SID c. High mAs d. Poor collimation

a. Issues in the plate handling system

What is required for all image artifacts according to best practice? a. Ignore them if minor b. Adjust brightness only c. Provide explanation and method for removal d. Repeat exposure immediately

c. Provide explanation and method for removal

ch23 _Technical_Considerations_DECK Flashcards

(192 cards)