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LMRT-RADIOGRAPHY ESSENTIALS
UPDATED ACTUAL EXAM WITH
CORRECT SOLUTIONS.
Which of the following changes in (KVP) will result in the greatest reduction of patient dose, when (MAS) is adjusted to compensate for the change? - correct answer- Increase kVp by 30%
Which of the following (IR) system speeds will result in the lowest patient dose? - correct answer- Faster speed IR system
What is the primary purpose of using gonad shields during radiography? - correct answer- Reduce the likelihood of genetic effects
Contact & shadow are two types of gonad shield - correct answer- TRUE
When should gonad shields be used? - correct answer- When the gonads are within 5cm of the radiation field
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The greatest cause of unnecessary radiation to patients that
can be controlled by the limited operator are: - correct answer-
repeat exposures
The limited operator can reduce repeat exposures by: - correct
answer- clearly instructing patients
How does x-ray beam restriction minimize patient 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 - correct answer- Collimator
How does filtration reduce patient 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 - correct answer- 2.5mm Al Equivalent
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What are the three principal methods used to protect limited operators from unnecessary radiation exposure? - correct answer- 1. Time
- Distance
- Shielding
Which of the following is NOT a type of personnel radiation shielding? - correct answer- a. Apron
- Glove
- Thyroid shield
- Shadow******** CORRECT
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? - correct answer- Scattered radiation from the patient
What is the term from radiation that escapes from the x-ray tube housing? - correct answer- leakage radiation
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Why are limited operators prohibited from activities that result in direct exposure to the primary x-ray beam? - correct answer- They are considered occupationally exposed individuals
Distance, as a method used to limit operator exposure, means
that: - correct answer- the operator should maximize the
distance from the source during an exposure.
Shielding worn for personnel protection is designed to attenuate what source of exposure - correct answer- scatter radiation
Which of the following is an acronym for a common type of personnel dosimeter - correct answer- TLD
What is the recommended placement for a personnel dosimeter on the body of the limited operator - correct answer- The badge should be worn in the region of the collar on the anterior surface of the body and outside the lead apron if worn.
What is the NCRP recommended annual effective dose limit for occupational exposure - correct answer- 5.0 rem (0.05 severt)
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