Question 1

Which of the following tests can be used to determine focal spot size?

Accepted Answer

A)  Safelight test
B)  Wire mesh test
C)  Wisconsin test cassette
D)  Star pattern test D

Question 2

The light field and radiation field of a radiographic unit must be congruent to within ____ of the SID.

Accepted Answer

A)  ±1%
B)  ±2%
C)  ±3%
D)  ±5% B

Question 3

During testing for grid uniformity, films should be uniform within an optical density of

Accepted Answer

A)  ±0.4.
B)  ±0.3.
C)  ±0.2.
D)  ±0.1. D

Question 4

Path closure in pluridirectional tomographic units should be within ____ of the path length.

Accepted Answer

A)  2%
B)  5%
C)  10%
D)  15%

Question 5

Conventional tomographic systems should produce images of tissue that lie within ____ mm of the indicated tomographic plane.

Accepted Answer

A)  5
B)  10
C)  15
D)  20

Question 6

Two common quality control tests that should be performed on grids are grid _____ and grid _____ tests.

Accepted Answer

A)  ratio; frequency
B)  alignment; uniformity
C)  ratio; alignment
D)  uniformity; ratio

Question 7

The maximum variation coefficient for reproducibility of x-ray generators is

Accepted Answer

A)  0.05.
B)  0.07.
C)  0.10.
D)  0.20.

Question 8

Collimation systems equipped with positive beam limitation must be accurate to within ____ of the SID.

Accepted Answer

A)  ±5%
B)  ±4%
C)  ±3%
D)  ±2%

Question 9

X-ray system mAs reciprocity has an acceptance parameter of

Accepted Answer

A)  ±5%.
B)  ±10%.
C)  ±15%.
D)  ±20%.

Question 10

During AEC evaluation with varying kVp, the AEC system should maintain a constant film density to within ____ optical density units.

Accepted Answer

A)  ±0.05
B)  ±0.1
C)  ±0.2
D)  ±0.3

Question 11

The x-ray tube must be mounted inside its housing so that the central ray exits the housing to within ____ degree(s) of perpendicular.

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Question 12

What is the acceptance criterion for a timer circuit with an exposure time shorter than 10 ms?

Accepted Answer

A)  5%
B)  10%
C)  15%
D)  20%

Question 13

Which of the following devices can be used as the sensor in AEC units?

Accepted Answer

A)  Ion chamber
B)  Photocell
C)  Solid-state detector
D)  All of the above

Question 14

The tomographic exposure angle indicated on the equipment and the actual tomographic angle must coincide within ____ degrees for units operating at angles greater than 30 degrees.

Accepted Answer

A)  2
B)  5
C)  10
D)  20

Question 15

An exposure of 600 mA and 16 ms yields an exposure output of 240 mR.What is the mR/mAs?

Accepted Answer

A)  2.5
B)  25
C)  250
D)  2500

Question 16

What is the NEMA allowance parameter for an x-ray tube that has a stated focal spot size of 1.5 mm?

Accepted Answer

A)  50%
B)  40%
C)  30%
D)  20%

Question 17

The minimum filtration required for general-purpose radiographic systems is _____ mm Al.

Accepted Answer

A)  2.0
B)  2.1
C)  2.5
D)  3.0

Question 18

The kilovolts peak (kVp) must be accurate to

Accepted Answer

A)  ±2%.
B)  ±5%.
C)  ±10%.
D)  ±15%.

Question 19

A synchronous spinning top is used on a three-phase unit with a time of 17 ms.Approximately how large of an arc should appear if the timer circuit is accurate?

Accepted Answer

A)  3 degrees
B)  6 degrees
C)  17 degrees
D)  36 degrees

Question 20

What is the accepted half-value layer (HVL) for an x-ray unit operating at 80 kVp?

Accepted Answer

A)  2.1 mm Al
B)  2.3 mm Al
C)  2.5 mm Al
D)  2.7 mm Al

Exam 7: Quality Control of X-Ray Generators and Ancillary Radiographic Equipment