Exam 6

Question 1

Which of the following is not an x-ray beam limitation device?

• Extension cylinder
• Collimator
• Filter
• Cone

Answer 1

Filter

Question 2

If the luminance of the collimator light source is adequate, the localizing light beam will satisfactorily outline the margins of the radiographic beam on the area of clinical interest on

• children only.
• teenagers and adults only. - - infants only.
• all patients.

Answer 2

all patients.

Question 3

When using digital fluoroscopy systems, making use of the last image hold feature can

• lead to a 50% reduction of technical exposure factors.
• be an effective dose reduction technique
• eliminate the need for body or part immobilization.
• eliminate the need to collimate the primary beam.

Answer 3

be an effective dose reduction technique

Question 4

What is the purpose of radiographic beam filtration?

• To reduce exposure to the patient’s skin and superficial tissues by absorbing most of the lower-energy photons from the heterogeneous beam.
• To reduce exposure to the patient’s skin and superficial tissues by removing all the lower-energy photons from the homogeneous beam.
• To reduce exposure to the patient’s skin and superficial tissues by absorbing all of the higher-energy photons from the homogeneous beam.
• To reduce exposure to the patient’s skin and superficial tissues by absorbing most of the higher-energy photons from the heterogeneous beam.

Answer 4

To reduce exposure to the patient’s skin and superficial tissues by absorbing most of the lower-energy photons from the heterogeneous beam.

Question 5

Depending on the area of the body being examined with a fluoroscopic image intensification system, a range of ___________ kVp is generally used for adult patients.

• 110 to 140
• 60 to 75
• 30 to 60
• 75 to 110

Answer 5

75 to 110

Question 6

During a fluoroscopic examination, a resettable cumulative timing device measures the x-ray beam-on time and sounds an audible alarm or in some cases temporarily interrupts the exposure after the fluoroscope has been activated for what length of time?

• 10 Minutes
• 3 Minutes
• 1 minute
• 5 Minutes

Answer 6

5 Minutes

Question 7

When obtaining a dorsoplantar projection of a foot, which of the following types of filters should be used to provide a greater uniform density of the anatomy?

• Thoraeus filter
• Bilateral wedge filter
• Wedge filter
• Trough filter

Answer 7

Wedge filter

Question 8

Total filtration of _______________________ for fixed x-ray units operating above 70 kVp is the regulatory standard.

• 1.0-mm aluminum equivalent
• 2.0-mm aluminum equivalent
• 2.5-mm aluminum equivalent
• 1.5-mm aluminum equivalent

Answer 8

2.5-mm aluminum equivalent

Question 9

In digital radiography the number of different shades of gray that can be stored in memory and displayed on a computer monitor is termed

• contrast matrix.
• grayscale.
• shadows.
• pixels.

Answer 9

grayscale.

Question 10

The control panel, where technical exposure factors are selected and visually displayed for the equipment operator, must be located

• at the head end of the radiographic examining table.
• at the foot end of the radiographic examining table.
• behind any regular wall that has a regular glass window that permits observation of the patient during any procedure.
• behind a suitable protective barrier that has a radiation-absorbent window that permits observation of the patient during any procedure.

Answer 10

behind a suitable protective barrier that has a radiation-absorbent window that permits observation of the patient during any procedure.

Question 11

Any image that must be performed more than once because of human or mechanical error during the production of the initial image is considered to be a repeat image. What effect does a repeat image have on the radiation dose received by the patient?

• The patient’s skin and possibly the gonads, if they were in the included imaged area, receive a double radiation dose.
• The patient receives no additional radiation dose.
• The patient’s superficial tissues only receive a radiation dose that is four times as great as that of the original radiation dose.
• The patient’s critical organs receive a radiation dose that is 10 times greater than the initial radiation dose.

Answer 11

The patient’s skin and possibly the gonads, if they were in the included imaged area, receive a double radiation dose.

Question 12

During a radiographic examination, which of the following combinations of technical exposure factors reduce patient radiation dose?

• Higher kVp, lower mAs
• Lower kVp, lower mAs
• Lower kVp, higher mAs
• Higher kVp, higher mAs

Answer 12

Higher kVp, lower mAs

Question 13

When a pregnant patient must undergo a radiographic procedure, which of the following practices will minimize radiation exposure?

• Opening the x-ray beam collimator shutters as wide as possible to ensure complete coverage of the image receptor
• Precisely collimate, and use appropriate technical exposure factors for the anatomical part
• Selecting technical exposure factors that are appropriate for the part of the body to be radiographed
• Precisely collimating the radiographic beam to include only the anatomic area of interest and shielding the lower abdomen and pelvis when this area does not need to be included in the area to be irradiated

Answer 13

Precisely collimate, and use appropriate technical exposure factors for the anatomical part

Question 14

Which of the following are considered to be benefits of an aggressive repeat analysis program?
1. Increased awareness among staff and student radiographers of the need to produce optimal quality recorded images from the start.
2. Radiographers become more careful in producing radiographic images because they are aware that images are being reviewed.
3. When the repeat analysis program identifies problems or concerns, in-service education programs covering these specific topics may be designed for imaging personnel.

• 2 only
• 1 only
• 3 only
• 1, 2, and 3

Answer 14

1, 2, and 3

Question 15

Which of the following must always be the first step in the protection of the reproductive organs?

• Use of a mobile protective shielding device
• Use of gonadal shielding
• Use of digital imaging equipment
• Adequate and precise collimation of the radiographic beam to include only the anatomy of interest

Answer 15

Adequate and precise collimation of the radiographic beam to include only the anatomy of interest

Question 16

Motion controlled by will is classified as voluntary motion. Lack of such control may be attributed to which of the following?
1. The patient’s age
2. Breathing patterns or problems
3. Physical discomfort
4. Fear of the examination
5. Mental instability

• 1, 2, 3, 4 and 5
• 1, 3, 4, and 5 only
• 2, 3, 4, and 5 only
• 1, 2, 3, and 4 only

Answer 16

1, 2, 3, 4 and 5

Question 17

When a properly calibrated automatic exposure control (AEC) is not employed to obtain a uniform selection of technical x-ray exposure factors, well-managed imaging departments

• have the radiologist determine and set up all technical exposure factor charts.
• make use of standardized technique charts that have been established for each x-ray unit in that facility.
• estimate technical exposure factors for all radiographic examinations.
• use technique charts borrowed from another imaging facility.

Answer 17

make use of standardized technique charts that have been established for each x-ray unit in that facility.

Question 18

Reducing the field size to the anatomic features of interest not only reduces patient exposure but also

• decreases recorded image quality by increasing scatter.
• increases recorded image quality by increasing scatter.
• decreases recorded image quality by decreasing scatter.
• increases recorded image quality by decreasing scatter.

Answer 18

increases recorded image quality by decreasing scatter.

Question 19

Because multiple bony areas span the entire body, the radiation dose absorbed by the organ called bone marrow

• can be accurately measured by a direct method.
• is not of concern during any diagnostic radiography examinations.
• cannot be measured by a direct method; it can only be estimated.
• can only be measured to a small degree by a direct method.

Answer 19

cannot be measured by a direct method; it can only be estimated.

Question 20

Of the following radiologic procedures, which is (are) considered nonessential?
1. A chest x-ray examination automatically scheduled on admission to the hospital
2. Lumbar spine x-ray examination as part of a pre-employment physical
3. Whole-body computed tomography (CT) screening

• 1 and 3 only
• 2 and 3 only
• 1, 2, and 3
• 1 and 2 only

Answer 20

1, 2, and 3