LMRT-Radiography Essentials 209 Questions with 100% Correct Answers, a comprehensive exam review
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Course
LMRT
Institution
LMRT
LMRT-Radiography Essentials QUIZ assess the knowledge and skills required for individuals pursuing a career in radiography, covering both theoretical and practical aspects of the field.
LMRT-Radiography Essentials QUIZ
WITH CORRECT ANSWERS 2024/25
UPDATE
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
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
What are the three principal methods used to protect limited operators from
unnecessary radiation exposure? - CORRECT ANSWER 1. Time
2. Distance
3. Shielding
Which of the following is NOT a type of personnel radiation shielding? - CORRECT
ANSWER a. Apron
b. Glove
c. Thyroid shield
d. 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
1
,LMRT-Radiography Essentials QUIZ
WITH CORRECT ANSWERS 2024/25
UPDATE
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
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)
What is the NCRP recommended monthly effective (or equivalent) dose limit to
the fetus for a prego worker? - CORRECT ANSWER 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the
annual occupational effective dose limit is likely to be received - CORRECT
ANSWER 10%
What is the conventional (British system) radiation unit to express radiation
intensity in air? - CORRECT ANSWER Roentgen
The conventional unit commonly used to report occupational dose to radiation
workers in the U.S. is the: - CORRECT ANSWER rem
What is the conventional (British system) radiation unit of absorbed dose -
CORRECT ANSWER Rad
According to the Bergonie Tribondeau law, which of the following types of cells
are most radiosensitive? - CORRECT ANSWER Embryonic tissue cells
2
, LMRT-Radiography Essentials QUIZ
WITH CORRECT ANSWERS 2024/25
UPDATE
Which type of x-ray photon interaction with the body is primarily responsible for
the radiation dose absorbed by the pt? - CORRECT ANSWER Photoelectric
What is the (NCRP) recommendation for lead equivalency of aprons used for
personnel protection? - CORRECT ANSWER 0.5 mm
What is erythema, as it relates to radiation exposure? - CORRECT ANSWER
reddening of the skin caused by a high radiation dose
What is the guiding philosophy of radiation protection? - CORRECT ANSWER
ALARA as low as reasonably achievable
Which of the following statements reflects current scientific opinion regarding the
effects of diagnostic levels of ionizing radiation - CORRECT ANSWER There is an
increased risk of cancer, leukemia, birth defects, and cataracts
Which of the following changes will decrease patient dose? - CORRECT ANSWER
*using a faster-speed class imaging system
*Increasing the kVp using the 15% rule while decreasing the mAs to compensate
When radiation exposure occurs during pregnancy, the greatest risk of birth
defects occurs when the exposure: - CORRECT ANSWER 1. exceeds 5 rad to the
uterus
2. occurs within the first trimester of pregnancy
At what kVp levels do Compton interactions occur - CORRECT ANSWER They
occur throughout the diagnostic radiology kVp range
What is the principal source of scatter radiation in radiography - CORRECT
ANSWER the IR
What are the four essential elements required for x-ray production - CORRECT
ANSWER 1. target
2. vacuum
3. electron source
4. high potential difference
The greatest portion of the x-ray beam is made up of: - CORRECT ANSWER
Bremsstrahlung Radiation
The penetrating power of the x-ray beam is controlled by varying the: - CORRECT
ANSWER Kilovoltage (kVp)
Which of the following functions involve the autotransformer - CORRECT
ANSWER kVp selection
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