Equipment design for Radiation Protection questions

Question 1

The radiographic beam should be collimated so that it is which of the following?
A. Slightly larger than the image receptor
B. No larger than the image receptor
C. Twice as large as the image receptor
D. Four times as large as the image receptor

Answer 1

B. No larger than the image receptor

Question 2

Both alignment and length and width dimensions of the radiographic and light beams must correspond to within:
A. !% of the SID
B. 2% of the SID
C. 5% of the SID
D. 10% of the SID

Answer 2

B. 2% of the SID

Question 3

What is the function of a filter in diagnostic radiology?
A. TO permit only alpha rays to reach the patient’s skin
B. TO permit only beta particles to interact with the atoms of the patient’s body
C. To decrease the x-radiation dose to the patient’s skin and superficial tissue
D. To remove gamma radiation from the useful beam

Answer 3

C. To decrease the x-radiation dose to the patient’s skin and superficial tissue

Question 4

HVL may be defined as the thickness of a designated absorber required to do which of the following?
A. Increase the intensity of the primary beam by 50% of its initial value
B. Increase the intensity of the primary beam by 25% of its initial value
C. Decrease the intensity of the primary beam by 50% of its initial value
D. Decrease the intensity of the primary beam by 25% of its initial value

Answer 4

C. Decrease the intensity of the primary beam by 50% of its initial value

Question 5

When compared with conventional screen-film systems, the photostimulable phosphor in the computed radiography imaging plate is much more sensitive to scatter radiation before and after it is sensitized through exposure to a radiographic beam. Because of this increased sensitivity, which of the following is true?
1. 5mm of added aluminum equivalent filtration myst always be used during routine CR imaging.
2. A radiographic grid may be used more frequently during CR imaging
3. Any source-to-image receptor distance can be used during CR imaging without adjustment in technical exposure factors
A. 1 only
B. 2 only
C. 3 only
D. 1, 2, and 3

Answer 5

B. 2 only

Question 6

To minimize skin exposure to electrons produced by photon interaction with the collimator, how far below the collimator should the patient's skin surface be?
A. At least 1 cm below
B. At least 5 cm below
C. At least 10 cm below
D. At least 15 cm below

Answer 6

D. at least 15 cm below

Question 7

WHich of the following aluminum equivalents for total permanent filtration meets the minimum requirement  for mobile diagnostic and fluoroscopic equipment?
A. 0.5 mm aluminum equivalent
B. 1.0 mm aluminum equivalent
C. 2.0 mm aluminum equivalent
D. 2.5 mm aluminum equivalent

Answer 7

D. 2.5 mm aluminum equivalent

Question 8

The trough or bilateral wedge filter which is used in some dedicated chest radiographic units is an example of which of the following
A. Compensating filter
B. Filter used in all digital imaging systems
C. Filter used in all dedicated mammographic units
D. Filter used in all computed tomography systems

Answer 8

A. Compensating filters

Question 9

To decrease patient exposure during fluoroscopic procedures, the fluoroscopist can
1. Limit the size of the fluoroscopic field to include only the area of anatomy that is of clinical interest
2. Employ the practice of intermittent or pulsed fluoroscopy to reduce the overall length of exposure
3. Choose to use a conventional fluoroscope instead of an image intensification fluoroscope
A. 1 & 2 only
B 1 & 3 only
C. 2 & 3 only
D. 1, 2, and 3

Answer 9

A. 1 & 2 only

Question 10

A diagnostic-type protective tube housing must be constructed so that leakage radiation measured at a distance of 1 m from the x-ray source dos not exceed _ when the tube is operated at its highest voltage a the highest current that allows continuous operation
A. 500 mR/hr
B. 300mR/hr
C. 100 mR/hr
D. 50 mR/hr

Answer 10

C. 100 mR/hr