Test Bank for Essentials of Radiographic Physics and Imaging 3RD EDITION WITH 100% CORRECT ANSWERS
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Test Bank for Essentials of Radiographic Physics and Imaging
3RD EDITION WITH 100% CORRECT ANSWERS
Chapter 03: Digital Radiographic Image Processing and Manipulation Carter: Digital Radiography and PACS, 3rd Edition
MULTIPLE CHOICE
1. Failure of the reader to find the collimation edges of a...
Test Bank for Essentials of Radiographic Physics and Imaging
3RD EDITION WITH 100% CORRECT ANSWERS
Chapter 03: Digital Radiographic Image Processing and Manipulation
Carter: Digital Radiography and PACS, 3rd Edition
MULTIPLE CHOICE
1. Failure of the reader to find the collimation edges of an imaabgirbe.
a. will result in image cutoff.
b. may cause the image to be too bright or too dark.
c. will eliminate all scatter.
d. will have no effect on the resultant image.
ANSWER: B OBJ: Describe the formation of an image histogram.
2. If the entire range of exposure were digitized, pixel values representing would be
digitized.
a. scatter
b. only diagnostic values
c. only the extreme values
d. all values
ANSWER: D OBJ: Describe the formation of an imagaebirb
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.
3. Data collected within the collimator are represented by a
a. histogram.
b. characteristic curve.
c. pixel graph.
d. matrix graph.
ANSWER: A OBJ: Describe the formation of an image histogram.
4. A histogram displays the useful signal by locating
a. all pixel values.
b. maximum and minimum signal.
c. maximum signal only.
d. minimum signal only.
ANSWER: B OBJ: Describe the formation of an image histogram.
5. The higher the kilovoltage peak, the
a. wider the histogram.
b. narrower the histogram.
c. higher the frequency.
d. lower the frequency.
ANSWER: B OBJ: Describe the formation of an image histogram.
6. The Nyquist theorem states that the
a. sampling frequency must be equal to the input signal bandwidth.
b. input signal bandwidth must be twice the sampling frequency.
c. sampling frequency must be twice the input signal banadbw
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d. input signal bandwidth must be sampled twice.
, ANSWER: C OBJ: State the Nyquist theorem.
7. If too few pixels are sampled, the result will be
a. high resolution.
b. low resolution.
c. high contrast.
d. low contrast.
ANSWER: B OBJ: State the Nyquist theorem.
8. Raw data used to form the image histogram are compared with
a. a normal histogram referenced by the computer.
b. all histograms stored for that anatomic part.
c. the last histogram of that anatomic part.
d. None of these
ANSWER: A OBJ: Describe the formation of an
image histogram.
9. Loss of detail in a digitally processed image
a. occurs because of the number of conversions.
b. is extremely minimal compared with film/screen.
c. is equal to film/screen.
d. has almost no impact on the image.
ANSWER: A OBJ: State the Nyquist theorem.
10. The longer an image is stored in the computed radiography (CR) cassette, the
a. more detailed the processed image.
b. more energy is lost by the electrons.
c. easier the image is to process.
d. slower the processing time.
ANSWER: B OBJ: State the Nyquist theorem.
11. A wraparound image or image aliasing occurs when
a. sampling occurs twice per cycle.
b. spatial frequency is less than the Nyquist frequency.
c. sampling occurs less than twice per cycle.
d. spatial frequency is equal to the Nyquist frequency.
ANSWER: C OBJ: State the Nyquist theorem.
12. In an effort to display the pixels for the area of interest when exposure is greater or less than
what is needed to produce an image, occurs.
a. overexposure
b. underexposure
c. automatic collimation
d. automatic rescaling
ANSWER: D OBJ: Discuss automatic rescaling.
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