Page 1 of 47
Limited Medical Radiologic Technologist
(LMRT) CORE Exam COMPLETE NEWEST
QUESTIONS AND VERIFIED SOLUTIONS
LATEST UPDATE THIS YEAR
The annual effective dose limit for an occupational radiation worker is:
50 mSv
When a body part appears on a radiograph as shorter than it actually is, the term used is:
foreshortening
Which of the following are the prime factors of exposure in radiography?
Milliamperage, exposure time, kilovoltage, and source-distance receptor distance (SID)
As kVp is increased, Compton interactions will:
increase.
The anode, or target, of the x-ray tube is ______ charged.
positively
Computed radiography (CR) eliminates the need for:
darkrooms
What is erythema?
Reddening of the skin caused by high-radiation dose
What are the four essential elements required for x-ray production?
A target, a vacuum, an electron source, and a high potential difference
Which control on the viewing station controls the density, or brightness, in the radiographic
image?
1
, Page 2 of 47
Window level
The purpose of the photostimulable phosphor plate is to:
acquire the image before it is sent to the CCD
The filament of an x-ray tube is made of:
a coil of tungsten wire.
A series of warm-up exposures is made on a cold x-ray tube to:
prevent damage to the anode from sudden heating.
What signed What signed document is required for experimental procedures or those that
carry substantial risk?
Informed consent
A low kVp setting produces an image with:
a short scale of contrast.
Which of the following practices might be characterized as slander?
Telling a co-worker that one of your patient's pathology was caused by unsafe sex
How is tuberculosis (TB) transmitted?
Spread by airborne transmission
The “electron cloud” that surrounds the hot cathode is referred to as a:
space charge
The varying intensity of radiation that exits on the opposite side of the patient and reaches
the IR is called __________ radiation.
remnant
The process of causing alternating (AC) current to flow in one direction (DC) only is called:
rectification.
Quantum mottle occurs when the:
mAs or kVp is set too low.
An x-ray exposure is made using the following factors: 400 mA, 0.02 sec, 80 kVp, 40 inches
SID, and the large focal spot. What is the mAs for this exposure technique?
2
, Page 3 of 47
8 mAs
How many detectors are most commonly built in to the AEC system and can be activated to
determine the exposure technique?
3
In radiography, patient dose is usually calculated:
at the skin level.
If the mA doubles, dose to the patient will:
increase 100%
Which of the following statements is true?
If the kVp increases, the:
scatter radiation fog increases.
A smaller effective focal spot produces:
greater spatial resolution.
The autotransformer is primarily used for:
variable kVp selection.
Patient doses in radiography are calculated as the:
entrance skin exposure (ESE).
When infection is spread by means of contaminated dust that contains endospores or droplet
nuclei, the means of transmission is called:
airborne contamination.
If the kVp is increased using the “15% rule,” an 80-kVp exposure would change to which of
the following?
92 kVp
Which of the following transformers reduces the voltage on the secondary side to provide an
appropriate current to heat the filament?
Step-down transformer
What is the medical term for fainting?
Syncope
3
, Page 4 of 47
Which of the following is a health care worker’s single best protection against disease?
Frequent hand hygiene
At what whole body equivalent dose will blood changes be seen?
0.25 Sv
Some x-ray generators are programmable and the exposure factors from the technique chart
can be programmed into the generator. This system is called:
anatomically programmed radiography (APR)
The relationship between SID and x-ray beam intensity is expressed in the _____ law.
inverse square
The process of reducing the probability of infectious organisms being transmitted to a
susceptible individual is called:
asepsis
What is one of the most important things a limited operator can do to control scatter
radiation?
Maintain the correct field size
If the size of the x-ray field increases, what happens to scatter radiation fog?
It increases
Which of the following are potential fomites in the radiology department?
1. IR
2. X-ray table
3. Positioning sponges
1, 2, & 3
A declared pregnant radiation worker should wear a second personnel monitor. This monitor
should be positioned at the:
waist level
The greatest spatial resolution will be produced when the matrix is __________ and the
pixels are __________.
large; small
4
Limited Medical Radiologic Technologist
(LMRT) CORE Exam COMPLETE NEWEST
QUESTIONS AND VERIFIED SOLUTIONS
LATEST UPDATE THIS YEAR
The annual effective dose limit for an occupational radiation worker is:
50 mSv
When a body part appears on a radiograph as shorter than it actually is, the term used is:
foreshortening
Which of the following are the prime factors of exposure in radiography?
Milliamperage, exposure time, kilovoltage, and source-distance receptor distance (SID)
As kVp is increased, Compton interactions will:
increase.
The anode, or target, of the x-ray tube is ______ charged.
positively
Computed radiography (CR) eliminates the need for:
darkrooms
What is erythema?
Reddening of the skin caused by high-radiation dose
What are the four essential elements required for x-ray production?
A target, a vacuum, an electron source, and a high potential difference
Which control on the viewing station controls the density, or brightness, in the radiographic
image?
1
, Page 2 of 47
Window level
The purpose of the photostimulable phosphor plate is to:
acquire the image before it is sent to the CCD
The filament of an x-ray tube is made of:
a coil of tungsten wire.
A series of warm-up exposures is made on a cold x-ray tube to:
prevent damage to the anode from sudden heating.
What signed What signed document is required for experimental procedures or those that
carry substantial risk?
Informed consent
A low kVp setting produces an image with:
a short scale of contrast.
Which of the following practices might be characterized as slander?
Telling a co-worker that one of your patient's pathology was caused by unsafe sex
How is tuberculosis (TB) transmitted?
Spread by airborne transmission
The “electron cloud” that surrounds the hot cathode is referred to as a:
space charge
The varying intensity of radiation that exits on the opposite side of the patient and reaches
the IR is called __________ radiation.
remnant
The process of causing alternating (AC) current to flow in one direction (DC) only is called:
rectification.
Quantum mottle occurs when the:
mAs or kVp is set too low.
An x-ray exposure is made using the following factors: 400 mA, 0.02 sec, 80 kVp, 40 inches
SID, and the large focal spot. What is the mAs for this exposure technique?
2
, Page 3 of 47
8 mAs
How many detectors are most commonly built in to the AEC system and can be activated to
determine the exposure technique?
3
In radiography, patient dose is usually calculated:
at the skin level.
If the mA doubles, dose to the patient will:
increase 100%
Which of the following statements is true?
If the kVp increases, the:
scatter radiation fog increases.
A smaller effective focal spot produces:
greater spatial resolution.
The autotransformer is primarily used for:
variable kVp selection.
Patient doses in radiography are calculated as the:
entrance skin exposure (ESE).
When infection is spread by means of contaminated dust that contains endospores or droplet
nuclei, the means of transmission is called:
airborne contamination.
If the kVp is increased using the “15% rule,” an 80-kVp exposure would change to which of
the following?
92 kVp
Which of the following transformers reduces the voltage on the secondary side to provide an
appropriate current to heat the filament?
Step-down transformer
What is the medical term for fainting?
Syncope
3
, Page 4 of 47
Which of the following is a health care worker’s single best protection against disease?
Frequent hand hygiene
At what whole body equivalent dose will blood changes be seen?
0.25 Sv
Some x-ray generators are programmable and the exposure factors from the technique chart
can be programmed into the generator. This system is called:
anatomically programmed radiography (APR)
The relationship between SID and x-ray beam intensity is expressed in the _____ law.
inverse square
The process of reducing the probability of infectious organisms being transmitted to a
susceptible individual is called:
asepsis
What is one of the most important things a limited operator can do to control scatter
radiation?
Maintain the correct field size
If the size of the x-ray field increases, what happens to scatter radiation fog?
It increases
Which of the following are potential fomites in the radiology department?
1. IR
2. X-ray table
3. Positioning sponges
1, 2, & 3
A declared pregnant radiation worker should wear a second personnel monitor. This monitor
should be positioned at the:
waist level
The greatest spatial resolution will be produced when the matrix is __________ and the
pixels are __________.
large; small
4
