Chapter 22 Tomosynthesis-Bushong Test Bank

Chapter 22 Tomosynthesis Bushong: Radiologic Science for Technologists




MULTIPLE CHOICE


1. The first digital radiographic tomosynthesis (DRT) appeared in which modality?
a. Computed tomography
b. Mammography
c. Pain management
d. Surgery




ANS: B
The first digital radiographic tomosynthesis (DRT) appeared in digital mammography.


2. During digital radiographic tomosynthesis (DRT), what is the range of the sweep of the
x-ray tube?
a. +/– 0 to +/– 5 degrees
b. +/– 5 to +/– 25 degrees
c. +/– 25 to +/– 35 degrees
d. +/– 35 to +/– 45 degrees




ANS: B
The range of the sweep of the x-ray tube during digital radiographic tomosynthesis (DRT)
is +/– 5 to +/– 25 degrees.
3. An advantage of DRT is to .
a. reduce or eliminate tissue superimposition
b. decrease patient dose

, c. image thicker body parts
d. improve image noise




ANS: A
The principal advantage of DRT is to reduce or eliminate tissue superimposition.


4. During digital radiographic tomosynthesis (DRT), what is the range of the sweep angle
of the x-ray tube?
a. 0 to 5 degrees
b. 5 to 25 degrees
c. 10 to 25 degrees
d. 10 to 50 degrees




ANS: D
The range of the sweep angle of the x-ray tube during digital radiographic
tomosynthesis (DRT) is 10–50 degrees.
5. Which of the following is an important sweep angle metric?
a. Angle of sweep
b. Scan time
c. Number of projections
d. Number of sweeps




ANS: B
An important sweep angle metric is scan time. Short scan time increases patient
throughput.
Perhaps more importantly short scan time minimizes patient motion blur.

, 6. DRT data projections are expressed in which units?
a. Degree sweep per sweep angle
b. Projections sampled per degree sweep
c. Sweep angle per projections sampled
d. Backprojection per projection




ANS: B
The number of data projections that are sampled has a significant impact on any DRT
examination. This characteristic is usually expressed as projections sampled per degree sweep
angle.
7. Which two factors determine image receptor speed and patient radiation dose?
a. Element thickness and pixel size
b. Pixel size and atomic number
c. Atomic number and element thickness
d. Element thickness and image receptor




ANS: C
The atomic number that determines the K-absorption edge energy and the capture
element thickness both determine the detective quantum efficiency (DQE) and therefore
image receptor speed and patient radiation dose.
8. What is the typical number of projections in DRT?
a. 1 to 9
b. 10 to 25
c. 26 to 40
d. 41 to 60