Chapter 16. Digital Image Descriptors and Evaluation-Bushong Test Bank

Chapter 16. Digital Image Descriptors and Evaluation Bushong: Radiologic Science for
Technologists




MULTIPLE CHOICE


1. A high-quality medical image should always demonstrate .
a. structures and tissues
b. high contrast
c. minimum magnification
d. structures and tissues, high contrast, and minimum magnification




ANS: A
A high-quality medical image should always demonstrate structures and tissues.


2. Spatial resolution improves with decreased
a. focal spot size.
b. motion.
c. pixel size.
d. focal spot size, motion and pixel size.




ANS: D
Spatial resolution improves with decreased screen blur, motion blur, and geometric
blur.


3. is defined as the ability to distinguish anatomical structures of similar subject contrast
and visually detect one from the other. a. Contrast resolution
b. Spatial resolution

, c. Detail
d. Noise




ANS: A
Contrast resolution is defined as the ability to image two separate objects and visually
detect one from the other.
4. Radiographic is random fluctuation of x-ray interaction on the image
receptor. a. detail
b. contrast
c. noise
d. resolution




ANS: C
Radiographic noise is random fluctuation of x-ray interaction on the image receptor.


5. Which of the following is the principal contributor to image noise in radiographic and
fluoroscopic imaging procedures?
a. Better resolution
b. Quantum mottle
c. Higher contrast
d. Improved detail




ANS: B
Quantum mottle is the principal contributor to image noise in radiographic and
fluoroscopic imaging procedures.
6. Which of the following will reduce quantum mottle?

, a. High mAs
b. Low kVp
c. Slower image receptors
d. High mAs, low kVp, and slower image receptors




ANS: D
The use of high-mAs, low-kVp, and slower image receptors reduces quantum mottle.


7. Higher speed image receptors generally produce images with
. a. better resolution
b. increased noise
c. higher contrast
d. improved detail




ANS: B
Higher speed image receptors generally produce images with increased noise.


8. The three primary geometric factors affecting image quality are
.
a. distortion, subject contrast, and mAs
b. patient thickness, distortion, and magnification
c. magnification, distortion, and focal spot blur
d. kVp, focal spot blur, and contrast




ANS: C