Chapter 15 Scatter Radiation-Bushong Test Bank

Chapter 15: Scatter Radiation Bushong: Radiologic Science for Technologists




MULTIPLE CHOICE


1. Image-forming x-rays include those which have been .
a. transmitted without interaction
b. scattered through Compton interaction
c. absorbed through photoelectric interaction
d. transmitted without interaction and scattered through Compton interaction




ANS: D
Image-forming x-rays are those which have been transmitted without interaction and
scattered through Compton interaction.
2. Which kVp selection would result in the most scattered x-rays in the image-forming
beam? a. 90 kVp
b. 75 kVp
c. 60 kVp
d. 50 kVp




ANS: A
The percentage of Compton interaction increases as kVp increases.
3. Approximately % of the x-ray beam incident on the patient is transmitted
through the patient without interaction to become part of the image-forming beam. a. 90%
to 99
b. 20% to 299
c. 10% to 99

, d. 1




ANS: D
Approximately 1% of the x-ray beam incident on the patient is transmitted through the
patient without interaction to become part of the image-forming beam.


4. The x-ray interaction that contributes to the clear parts of the image is .
a. coherent scatter
b. Compton interaction
c. photoelectric interaction
d. pair production




ANS: C
The x-ray interaction that contributes to the clear parts of the image is
photoelectric interaction.
5. Compton scatter contributes to .
a. useful information
b. image noise
c. image contrast
d. useful information, image noise and image contrast




ANS: B
Compton scatter contributes only to image noise.
6. The three primary factors influencing the intensity of scatter in the image-forming beam
are
.

, a. mAs, kVp, and collimation
b. mAs, filtration, and grids
c. kVp, field size, and patient thickness
d. filtration, patient thickness, and mAs




ANS: C
The three primary factors influencing the intensity of scatter in the image-forming beam
are kVp, field size, and patient thickness.
7. Decreasing the kVp will increase .
a. patient dose
b. image noise
c. Compton scatter
d. optical density




ANS: A
Decreasing the kVp will increase patient dose.


8. Photoelectric interactions increase when is decreased.
a. mAs
b. patient thickness
c. filtration
d. kVp




ANS: D
Photoelectric interactions increase when kVp is decreased.