- Digital imaging processing refers to:
a. computer manipulations applied to digital images.
b. creation of the digital latent image.
c. chemical processing of the digital image.
d. none of the above.
a. computer manipulations applied to digital images.
Digital imaging processing refers to how the computer manipulates the digital image data.
REF: p.68
- A combination of rows and columns (array) of pixels is called a:
a. matrix.
b. field of view.
c. voxel.
d. liquid crystal display.
a. matrix.
A digital image is recorded as a matrix or combination of rows and columns (array) of small, usually square, “picture elements” called pixels.
REF: p.68
- The size of a pixel is measured in:
a. millimeters.
b. inches.
c. hertz.
d. microns.
b. inches.
The size of a pixel is measured in inches.
REF: p.68
- Digital image quality is improved with:
a. larger size matrix.
b. larger size pixels.
c. smaller size matrix.
d. smaller size pixels.
e. A and B.
f. A and D.
g. C and D.
f. A and D.
Digital image quality is improved with a larger matrix size that includes a greater number of smaller pixels.
REF: p.70
- If the field of view is increased for a fixed matrix:
a. the pixel size is increased.
b. the pixel size is decreased.
c. the pixel size is not affected.
a. the pixel size is increased.
If the FOV is increased for a fixed matrix size, then the pixel size is also increased (direct relationship).
REF: p.68
- If the matrix is increased for a given FOV:
a. spatial resolution is increased.
b. spatial resolution is decreased.
c. spatial resolution is not affected.
a. spatial resolution is increased.
If the matrix is increased for a given field of view, the pixel size is decreased, which increases the spatial resolution.
REF: p.70
- If the field of view is 500 mm and the matrix is 1024, what are the pixel dimensions?
a. 0.49 mm × 0.49 mm
b. 0.49 mm × 0.1024 mm
c. 0.49 mm × 2.048 mm
a. 0.49 mm × 0.49 mm
500 ÷ 1024 = 0.49 mm pixel size
REF: p.69
- The number of bits that determines the amount of precision in digitizing the analog signal and the number of gray shades that can be displayed in the image is the:
a. matrix.
b. bit depth.
c. binary code.
d. analog to digital converter.
b. bit depth.
The bit depth determines the amount of precision in digitizing the analog signal and the number of gray shades that can be displayed in the image.
REF: p.71
- A larger bit depth:
a. results in increased spatial resolution.
b. reduces the number of shades of gray.
c. increases the number of shades of gray.
d. affects both digital and film-screen image quality.
c. increases the number of shades of gray.
A larger bit depth results in more shades of gray being available to be assigned to the digital image’s pixel.
REF: p.71
- A larger bit depth:
a. increases contrast resolution.
b. decreases contrast resolution.
c. has no effect on contrast resolution.
d. increases the pixel density.
a. increases contrast resolution.
A larger bit depth, providing more gray level choices, increases contrast resolution.
REF: p.71
- The pixel bit depth determines the image’s:
a. brightness.
b. contrast.
c. spatial resolution.
d. contrast resolution.
d. contrast resolution.
Contrast resolution is determined by the pixel bit depth. The greater the pixel bit depth, the more shades of gray to be used.
REF: p.71
- A 10-bit depth can display how many shades of gray?
a. 10
b. 1024
c. 4096
d. 16,384
b. 1024
A 10-bit depth can display 2¹⁰ or 1024 shades of gray.
REF: p.71
- A system that can digitize and display a greater number of shades of gray will have ________ contrast resolution.
a. increased
b. decreased
c. no
a. increased
A system that can digitize and display a greater number of shades of gray will have better contrast resolution.
REF: p.71
- The greater the pixel bit depth, the ________ the digitization of the analog signal, and the ________ the number of shades of gray available for image display.
a. more precise; greater
b. less precise; greater
c. more precise; lesser
d. less precise; lesser
a. more precise; greater
The greater the pixel bit depth (i.e., 16 bit), the more precise the digitization of the analog signal, and the greater the number of shades of gray available for image display.
REF: p.71
- The number of pixels per unit area is called the:
a. matrix.
b. pixel pitch.
c. bit depth.
d. pixel density.
d. pixel density.
The number of pixels per unit area is the pixel density.
REF: p.72
- The pixel spacing or distance measured from the center of a pixel to an adjacent pixel is called the:
a. matrix.
b. pixel pitch.
c. bit depth.
d. pixel density.
b. pixel pitch.
The pixel spacing or distance measured from the center of a pixel to an adjacent pixel is called the pixel pitch.
REF: p.72
- Which of the following results in improved spatial resolution?
a. Increased pixel density
b. Increased pixel pitch
c. Decreased pixel density
d. Decreased pixel pitch
e. A and D
f. B and C
e. A and D
Increased pixel density and decreased pixel pitch will result in smaller-sized pixels and improved spatial resolution
REF: p.72
- Increasing the number of line pairs per millimeter resolved in the imaging system results in:
a. higher spatial frequency.
b. lower spatial frequency.
c. increased spatial resolution.
d. decreased spatial resolution.
e. A and C.
f. B and D.
e. A and C.
Increasing the number of line pairs per millimeter resolved in the imaging system (higher spatial frequency) results in improved spatial resolution.
REF: p.72
- The measure of the imaging system’s ability to display the contrast of anatomic objects varying in size is the:
a. spatial frequency.
b. modulation transfer function.
c. maximum intensity.
d. minimum intensity.
b. modulation transfer function.
The measure of the imaging system’s ability to display the contrast of anatomic objects varying in size is the modulation transfer function (MTF).
REF: p.74
- An MTF of 1.0 means:
a. no difference in brightness levels.
b. no difference in spatial frequency.
c. maximum difference in brightness levels.
d. A and B.
e. B and C.
c. maximum difference in brightness levels.
An MTF of 1.0 means a maximum difference in brightness levels.
REF: p.74
- Which of the following is true concerning computed radiography imaging plates?
a. The CR cassette houses the imaging plate.
b. The radiation exiting the patient interacts with the imaging plate.
c. The photon intensities are absorbed by the phosphor.
d. All of the above.
d. All of the above.
The radiation exiting the patient interacts with the CR IP, where the photon intensities are absorbed by the phosphor.
REF: p.75
- What is the term generally used to describe the emission of light from a substance as the result of stimulation by radiation?
a. Luminescence
b. Phosphorescence
c. Fluorescence
d. Incandescence
a. Luminescence
Luminescence is the general term that describes the emission of light in response to exposure to x-rays.
REF: p.75
- The CR phosphor layer is composed of:
a. gadolinium oxysulfide with terbium.
b. barium fluorohalide with europium.
c. lanthanum oxybromide with thulium.
d. yttrium oxysulfide with terbium.
b. barium fluorohalide with europium.
Barium fluorohalide, coated with europium, is the major component of the CR phosphor layer.
REF: p.75
- The CR latent image consists of:
a. electrons trapped in the phosphor layer.
b. clumps of metallic silver in the emulsion.
c. light trapped in the phosphor layer.
d. the image as seen on the display monitor.
a. electrons trapped in the phosphor layer.
The CR latent (invisible) image is formed by electrons trapped in the phosphor layer.
REF: p.76
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Chapter 142
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Chapter 2 - 132
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Chapter 2 - 234
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Chapter 3 - 134
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Chapter 3 - 234
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Chapters 4 - 134
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Chapter 4 - 234
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Chapter 4 - 333
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Chapter 5 - 150
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Chapter 6 - 134
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Chapter 6 - 233
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Ch 754
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Ch 9 - 02 - film screen imaging34
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Ch 857
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Ch 9 - 01 - film screen imaging35
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Ch 10 - 01 - Flouroscopy39
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Ch 10 - 02 - Fluoroscopy39
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Josi Study Guide33
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Useful Info1
