System Operation & Components

Question 1

2. Which system component converts the projection attenuation data into the proper digital form for the array processor?

A. Detector
B. Photodiode
C. Analog to digital converter
D. Host computer

Answer 1

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Question 2

3. Which of the following is not a function of the PACs system

A. Reconstruction of the image from the raw data
B. Long term data storage
C. Digital distribution of images
D. Image display for the radiologists

Answer 2

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Question 3

4. Which of the following is not a part of this CT tube?

A. Tungsten target
B. Collimator
C. Rotating anode
D. Filament

Answer 3

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Question 4

5. Which of the following is false regarding CT systems

A. They are limited to non-oblique transverse scanning
B. They cannot generate a straight coronal or sagittal image
C. They have no moving parts

Answer 4

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Question 5

6. X-rays are using CT because?

A. They are easily produce but the high frequency generator
B. They are less harmful than a heating effects of a microwave radiation
C. They penetrate the body according to specific attenuation characteristics of each tissue
D. The FDA a imposes no limit on the dose to the patient

Answer 5

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Question 6

7. Most of the commands from the technologist are received by the?

A. Array processor
B. Operators console
C. Host computer
D. Amplifier

Answer 6

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Question 7

8. X-rays are produced whenever fast moving electrons collide with any form of matter because?
9. The electron splits into two x-rays photons of equal energy upon impact with the matter
10. The electron loses kinetic energy which is converted into the emission of an x-ray photon
11. The electron converts the electron it collides with into a x-ray photon
    Which ones are correct

Answer 7

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Question 8

9. The mA determines that the?

A. Quantity of x-rays photons
B. Co efficient of attenuation
C. Slice thickness
D. Energy level of the x-ray photons

Answer 8

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Question 9

10. Which of the following is a component not normally located in the gantry of the modern CT system

A. Pre-patient collimators
B. Solid-state detectors
C. Array processor
D. X-ray tube

Answer 9

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Question 10

11. Tube interscan delay time refers to

A. The time between the end of one scan and the start of the next scan during which the tube will cool

B. The quality insurance test performed daily by the technologist

C. The time required for the tube to make a complete 360° revolution about the gantry

D. The length of time required for the production of photons to begin after applying the voltage to the tube

Answer 10

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Question 11

12. Increase ____________ Will increase that likelihood that a given x-ray will penetrate a material?
13. kV
14. mA
15. exposure time

Which ones are correct

Answer 11

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Question 12

13. Which of the following are not commonly use on today’s commercially available CT scanners
14. Xeon detectors
15. Fourth generation technology
16. Continuous rotation technology

Which ones are correct

Answer 12

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Question 13

14. Which of the following statements is false regarding occurrences after an x-ray photon penetrates the detector aperture?
15. The photon can pass through the detector unmeasured
16. The photon is converted completely into a electron
17. The measured single is enhanced by amplifier

Which ones are correct

Answer 13

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Question 14

15. Scatter radiation is caused bye

A. Miss calibrated detector
B. X-rays and generated spontaneously in the ambient atmosphere
C. Deflections from the original trajectory
of an x-ray photons through the patient
D. Improper patient positioning

Answer 14

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Question 15

16. What controls does the operator have over the x-rays in a CT exam?

A. The temperature and color of the x-rays can be tuned
B. The energy level and the quantity of x-rays can be selected
C. The volume and tone of the x-rays can be dialed
D. The phase and frequency of the x-rays can be adjusted

Answer 15

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Question 16

17. Which of the following is a standard that’s used to achieve compatibility for image transfer between various imaging modalities viewing stations and printers in a hospital

A. TCP/IP
B. T1
C. PACS
D. DICOM

Answer 16

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Question 17

18. Enormous heat builds up in a CT tube is caused by the

A. Intensity of the x-rays in emitted from the tube
B. Electron beam between the Cathode and anode in the tube
C. X-ray filter in the tube which absorbs the lower energy photons before they can enter the patient
D. Collision of the electron beam with the tungsten target on the tube anode

Answer 17

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Question 18

19. ___________________ made helical imaging possible

A. Multi-row detector scanners
B. The introduction of second generation technology
C. The introduction of fourth generation technology
D. Continuous rotation scanners

Answer 18

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Question 19

20. The patient table:

A. May move continuously during the scan
B. Can never be position automatically by software due to safety precautions
C. Remains stationary throughout the patient exam once it is in the Shiley positioned
D. Only moves after each slice is completed

Answer 19

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Question 20

21. The main purpose of the detector is to:

A. Provide additional collimation in order to reduce scatter
B. Limit the x-ray dose to the patient
C. Catcher x-rays photons and convert them to a measurable signal
D. Amplify the measured signal

Answer 20

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Question 21

22. The cathode white filament:

A. Helps determine the size of the focal spot
B. Lights up the tube so it can be serviced by engineer
C. Releases the x-ray photons
D. Focuses x-rays on to the anode target

Answer 21

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Question 22

23. Which of the following statements is true?
24. KV is the voltage potential between the tube Cathode and anode while mA ultimately controls the filament current and thus the temperature of the cathode filament
25. Kate V controls the energy level of the x-ray photons and mA controls the number of x-ray photons emitted from the tube
26. Although the KV and mA affect the operation of the CT x-ray tube, the two parameters have no bearing on image quality

Answer 22

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Question 23

24. The number of electrons flow from the cathode to the anode to the tube is controlled by the

A. Android target
B. Collimation
C. mA
D. kV

Answer 23

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Question 24

25. Which of the following is true regarding solid-state detectors
26. X-ray photons cause the detectors to generate a flash of light
27. They are the detector type use on most CT scan or’s today
28. They can be used in both the third generation and fourth generation CTs systems

Answer 24

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Question 25

26. The slip ring on continuous rotation CT scanners ; 1. Prevents the high voltage cables from winding up 2. Allows the exam to commence more rapidly 3. Eliminates the need for the reversal of gantryframe rotation

Answer 25

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Question 26

27. CT is commonly referred to as all of the following names except A. Computerized axial tomography B. Digital subtraction angiography C. Cat scan D. Computer tomography

Answer 26

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Question 27

28. Which of the following CT scan or designs does not use an x-ray tube A. First generation CT B. Pet/CT C. Electron beam CT D. MDCT

Answer 27

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Question 28

29. _____________ allows remote authorized individuals to connect to a server in a secure fashion using the routing and fracture provided on the public network such as a Internet A. D I COM B. T1 lines C. VPNS D. Increase bandwidth

Answer 28

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Question 29

30. Which technology do multirow detectors scanners employ A. Second-generation B. Third-generation C. Fourth generation D. First-generation

Answer 29

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Question 30

31. Which of the following statements is false regarding the collection of CT data? A. Long scans times or more desirable because they average out motion artifact B. The reconstruction process used to create the image occurs in the array processor C. To collect the complete set of CT data x-rays must be passed through the body at many different angles D. The detectors measured x-rays which completely penetrate the patient

Answer 30

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Question 31

32. On a single Row detecter scanner; collimation? 1. Controls the slice thickness 2. Minimize the x-ray dose to the patient 3. Reduces the detection of scatter radiation

Answer 31

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Question 32

33. And a radiology department a ____________ is an example of a client on the network 1. CT scanner 2. Viewing console in the physician reading room 3. Printer for diagnostic images

Answer 32

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Question 33

34. Which of the following is true regarding multiRow detector CT scanners 1. The size of the detector array along the Z direction may be different 2. Attenuation information rom adjacent detector array may be added together to generate a thicker slices. 3. All of the detector arrays may or may not be used

Answer 33

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Question 34

35. The CT x-ray tube rotates around the patient to 1. Keep the tube cool 2. Generate projection views at different angles 3. Minimize the x-ray administered to the patient

Answer 34

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Question 35

36. Collimation: 1. Is accomplished by electronically blocking x-rays 2. Affects the scan time 3. Limits the low energy x-ray photons and passes the high energy photons 4. Is accomplished by physically blocking x-rays

Answer 35

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Question 36

37. Tungsten is used as the target material on the tubes android because it has a ______ atomic number and a ________ melting point . A. Low, high B. High, low C. Low, low D. High, high

Answer 36

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Question 37

38. CT images can be directly scanned and planes other than transverse by 1. Orienting the patient body part so that it is not perpendicular to the x-ray beam 2. Tilting the gantry 3. Changing the angle that the x-ray beam leaves the tube

Answer 37

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Question 38

39. Which of the following does not affect the quantity of x-rays the completely penetrates the patient 1. The distance that the x-ray photons must travel on their course through the patient body 2. The Molecule composition of the tissue through which the x-ray photons pass 3. The type of detector material used

Answer 38

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Question 39

40. The operators console may include 1. Monitor 2. Keyboard 3. Graphic input device

Answer 39

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Question 40

1. In order for an x-ray photons to be measured it Must? 1. Enter the detector chamber 2. Be absorbed by detector material 3. Be converted to a measurable event Which ones are correct

Answer 40

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