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LXMO Core Module exam with complete solutions
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LXMO Core Module exam with complete solutions
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LXMO Core Module exam with completesolutions
Which of the following statement are correct regarding the link between radiation
dose and genetic effects?
1. The link has been demonstrated in human studies.
2. The link has been demonstrated in animal studies.
3. Increased risk to humans cannot be predicted with respect to an individual. -
ANSWER-2 and 3 only
Which of the following changes in kVp will result in the greatest reduction of
patient dose, when milliampere-seconds (mAs) is adjusted to compensate for the
change?
A. Decrease kVp by 30%
B. Decrease kVp by 15%
C. Increase kVp by 15%
D. Increase kVp by 30% - ANSWER-D. 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
C. It does not matter; the IR system speed does not affect the pt. dose. -
ANSWER-B. Faster-speed IR system
What is the primary purpose of using gonad shields during radiography?
A. Reduce the likelihood of genetic effects
B. Reduce the likelihood of somatic effects
C. Protect patient modesty
,D. Demonstrate the location of the gonads in the image - ANSWER-A. Reduce the
likelihood of genetic effects
Which of the following are types of gonad shields?
1. Aperture
2. Contact
3. Shadow - ANSWER-2 and 3 only
When should gonad shielding be used?
A. For all patients
B. For all procedures
C. When the gonads are within 10 cm of the radiation field
D. When the gonads are within 5 cm of the radiation field - ANSWER-D. 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 exposures
D. Equipment malfunction - ANSWER-C. Repeat exposures
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. It limits repeat exposures - ANSWER-B. Clearly instructing patients
How does x-ray beam restriction minimize patient exposure?
A. It limits fog radiation
B. It limits the radiation field to the area of interest
C. It limits the effect of patient motion
D. It limits repeat exposures - ANSWER-B. 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. Shield - ANSWER-A. Collimator
How does filtration reduce patient exposure?
A. Removes shorter-wavelength photons
B. Removes longer-wavelength photons
C. Reduces the size of the radiation field
D. Reduces the time of exposure - ANSWER-B. Removes longer-wavelength
photons
What is the National Council on Radiation Protection and Measurements (NCRP)
recommendation for the amount of total filtration?
A. 0.5 mm aluminum equivalent (Al equiv)
B. 1.5 mm Al equiv
C. 2.5 mm Al equiv
D. 3.5 mm Al equiv - ANSWER-C. 2.5 mm Al equiv
What ar ethe three prinvipal methods used to protect limited operators from
unnecessary radiation exposure?
A. Time, idstance, and shielding
B. Time distance, and collimation
C. Distance, collimation, and shielding
D. Time, collimation, and filtration - ANSWER-A. Time, distnce, and shielding
Which of the following is not a type of personnel radiation shielding?
A. Apron
B. Glove
C. Thyroid shild
D. Shadow - ANSWER-D. Shadow
Personnel shielding must be worn on the rare occasion during which the limited
operator may need to remain in the radiographic room during an exposure to
assist the patient in maintaining the proper position. What is the source of the
greatest radiation hazard under this circumstance?
A. Off-focus radiation
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