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Flashcards in Rad Review 100-150 Deck (20)
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1

If the primary coil of a high-voltage transformer is supplied by 220 V and has 400 turns and the secondary coil has 100,000 turns, what is the voltage induced in the secondary coil?

A. 80 kV
B. 55 kV
C. 80 V
D. 55 V

B. 55 kV

2

Components of digital imaging include

1. computer manipulation of the image
2. formation of an electronic image on the radiation detector
3. formation of an x-ray image directly on the emulsion

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

B. 1 and 2 only

1. computer manipulation of the image

2. formation of an electronic image on the radiation detector

3

Which of the following is/are components of the secondary, or high voltage, side of the x-ray circuit?

1. Rectification system
2. Autotransformer
3. kV meter

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

A. 1 only

1. Rectification system

4

Bone densitometry is often performed to

1. measure degree of bone (de)mineralization
2. evaluate results of osteoporosis treatment/therapy
3. evaluate condition of soft tissue adjacent to bone

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

B. 1 and 2 only

1. measure degree of bone (de)mineralization

2. evaluate results of osteoporosis treatment/therapy

5

Histogram data that is skewed relative to the values of interest (VOI) of the histogram analysis used for a particular exam may be caused by all of the following, except:

A. Anatomical structures not centered to the IP
B. Excessive windowing
C. The X-ray beam is not correctly aligned to the edges of the IP
D. The beam edge is irregular because of overlap of a radiopaque shadow, such as a gonadal shield

EXCEPT

B. Excessive windowing

6

The part of a CT imaging system made of thousands of solid-state photodiodes is the

A. gantry.
B. detector array.
C. collimator assembly.
D. x-ray tube.

B. detector array.

7

Which of the following digital post-processing methods remove high-frequency noise from the image?

A. Edge enhancement
B. Windowing
C. Smoothing
D. Aliasing

C. Smoothing

8

To maintain image clarity in an image-intensifier system, the path of electron flow from the photocathode to the output phosphor is controlled by

A. the accelerating anode
B. electrostatic lenses
C. the vacuum glass envelope
D. the input phosphor

B. electrostatic lenses

9

The movement of the IP through the transport system of a CR reader is referred to as the:

A. Slow-scan direction
B. Charge-coupled direction
C. Nyquist direction
D. Fast-scan direction

A. Slow-scan direction

10

Which of the following would be appropriate IP front material(s)?

1. Tungsten
2. Magnesium
3. Bakelite

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

C. 2 and 3 only

2. Magnesium
3. Bakelite

11

The functions of a picture archiving and communication system (PACS) include

1. storage of analog images
2. retrieval of digital images
3. storage of digital images

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

C. 2 and 3 only

2. retrieval of digital images
3. storage of digital images

12

Characteristics of the metallic element tungsten include

1. ready dissipation of heat
2. high melting point
3. high atomic number

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

D. 1, 2, and 3

1. ready dissipation of heat
2. high melting point
3. high atomic number

13

The optimal alignment of the anatomical part being imaged for all digital receptors should be:

A. Field centered to IP with at least two collimation margins and parallel to the IP edges
B. Centered anywhere on the IP, but having four distinct collimation margins, regardless of parallel orientation to the IP edges
C. Centered to the IP with at least one collimation margin aligned to nearest edge of IP
D. Field centered to IP with four collimation margins parallel to the IP edges

D. Field centered to IP with four collimation margins parallel to the IP edges

14

Which of the following is (are) demonstrated in a lateral projection of the cervical spine?

1. Intervertebral foramina
2. Zygapophyseal joints
3. Intervertebral joints

A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3

C. 2 and 3 only

2. Zygapophyseal joints
3. Intervertebral joints

15

In order to avoid background radiation artifacts when using CR, it is important to:

A. Erase all image plates that have not been used for 48 hours
B. Erase all image plates if there is any question about how long it has been since the plate has been erased
C. Erase an image plate if there is any doubt as to when it was last erased, especially in the case of pediatric radiography
D. All of these are correct actions

D. All of these are correct actions

16

A 15% decrease in kilovoltage accompanied by a 50% increase in milliampere-seconds will result in a(n)

A. increase in patient dose
B. increase in exposure latitude
C. decrease in receptor exposure
D. decrease in spatial resolution

A. increase in patient dose

17

Which of the following is (are) tested as part of a quality assurance (QA) program?

1. Beam alignment
2. Reproducibility
3. Linearity

A. 1 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2, and 3

D. 1, 2, and 3

1. Beam alignment
2. Reproducibility
3. Linearity

18

Shape distortion is influenced by the relationship between the

1. x-ray tube and the part to be imaged.
2. body part to be imaged and the IR.
3. IR and the x-ray tube.

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2, and 3

D. 1, 2, and 3

1. x-ray tube and the part to be imaged.
2. body part to be imaged and the IR.
3. IR and the x-ray tube.

19

A star pattern is used to measure

1. focal spot resolution.
2. scatter resolution.
3. SID resolution.

A. 1 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2, and 3

A. 1 only

1. focal spot resolution.

20

Which of the following indicates the scapular costal surface seen in the figure below?

A. D
B. H
C. K
D. M

C. K