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LMRT STATE REVIEW
ACTUAL EXAM WITH CORRECT
SOLUTIONS.
Which of the following statements are correct regarding the link between radiation dose and genetic effects?
- The link has been demonstrated in human studies.
- The link has been demonstrated in animal studies.
- increased risk to humans cannot be predicted with respect to
an individual. - correct answer- 2 and 3 only
Which of the following changes in kilovoltage (KVP) will result in the greatest reduction of patient dose, when milliamperage- seconds (mAs) is adjusted to compensate for the dosage?A.) Decrease kVp by 30% B.) Decrease kVp by 15% C.) Increase kVp by 15% D.) Increase kVp by 30% - correct answer- Increase kVp by 30%
Which of the following image receptor (IR) system speeds will result in the lowest patient dose?A.) slower speed IR system B.) Faster speed IR system 1 / 4
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C.) It does not matter; the IR system speed does not affect the patient dose. - correct answer- Faster speed IR system
What is the primary purpose of using gonad shields during radiography?A.) Reduce the likelihood of genetic changes B.) Reduce likelihood of somatic effects C.) Protect patient modesty D.) Demonstrate the location of the gonads in the image - correct answer- Reduce the likelihood of genetic changes
Which one of the following are types of gonad shields?
- Aperture
- Contact
- Shadow
A.) 1 and 2 only B.) 1 and 3 only C.) 2 and 3 only D.) 1, 2, and 3 - correct answer- 2 and 3 only
When should gonad shielding be used?A.) for all patients B.) For all procedures 2 / 4
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C.) when the gonads are within 10 cm of the radiation field D.) when the gonads are within 5 cm of the radiation field - correct answer- when the gonads are within 5 cm of the radiation field
The greatest cause of unnecessary radiation to patients that
can be controlled by the limited operator is:
A.) Patient condition B.) Patient size C.) Repeat exposure D.) equipment malfunction - correct answer- Repeat exposure
The limited operator can reduce repeat exposures by:
A.) Accepting marginal images B.) Clearly instructing patients C.) increasing the source-image receptor distance (SID) D.) optimizing the kVp - correct answer- Clearly instructing patients
How does x-ray beam restriction minimize patient exposure?A.) it limits radiation fog B.) It limits the radiation field to the area of interest C.) It limits the effect of patient motion 3 / 4
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D.) It limits repeat exposure - correct answer- It limits the radiation field to the area of interest
What is the device that allows the limited operator to vary the size of the radiation field?A.) Collimator B.) Detent C.) Filter D.) Sheild - correct answer- Collimator
How does filtration reduce patient exposure?A.) Removes the shorter-wavelength photons B.) Removes longer wavelength photons C.) Reduces the size of the radiation field D.) Reduces the time of exposure - correct answer- Removes longer wavelength photons
What is the National Council on Radiation Protection and Measurements (NCRP) recommendation for the amount of total filtration?A.) 0.5mm aluminum equivalent ( AL Equiv) B.) 1.5mm AL Equiv C.) 2.5mm Al Equiv
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