LMRT ARRT EXAM WITH CORRECT
ANSWERS 2025
Roentgen discovered x-rays while working with a tube? - correct
answers - Crookes
An "electron cloud" surrounding the filament of the cathode is referred to
as a - correct answers - Space charge
Free electrons of X-ray production come from the - correct answers -
Filament
The creation of the space charge in the X-ray tube produces: - correct
answers - thermionic emission
The majority of photons in the X-ray beam are created by which
process? - correct answers - Bremsstrahlung interactions
More than 99% of the energy of the electron stream is converted into: -
correct answers
- heat
the high-speed rotation (10,000 rpm) of the anode enables - correct
answers - Greater dissipation of heat from high technical factors
The degree of angulation of the x-ray tube target will determine the: -
correct answers - size of the actual and effective focal spot
A dual-focus X-ray tube has:
1: Two filaments
2: Two focal spot sizes
3: Two anodes - correct answers - 1 and 2
The anode heel effect is a phenomenon of X-ray production that results
in: - correct answers - Uneven distribution of radiation within the x-ray
field
The penetrating power of the X-ray beam is controlled by varying the -
correct answers - Peak kilovoltage (kVp)
The rate flow of current flow across the X-ray tube is measured in - correct
answers - mA
, Doubling the mA will result in
1: increased patient dose
2: twice as many photons in the X-ray beam
3: increased radiographic density - correct answers - 1, 2, and 3
The unit used to indicate the total quantity of X-ray expose is - correct
answers - Millionsampere-seconds (mAs)
The device for removing long-wavelength radiation from the primary X-ray
beam is the - correct answers - Filter
X-ray equipment capable of producing 70 kVp or more is required to have
total filtration of at least: - correct answers - 2.5 mm Al equiv
The purpose of rotating the anode of the X-ray tube is to - correct answers
- Increase the heat capacity of the anode
Image sharpness is determined by the - correct answers - Size of the
effective focal spot
Above 70 kVp, what percentage of photons is created by the bremsstrahlung
process? - correct answers - 85%
The amount detail seen in the X-ray image is referred to as - correct
answers - spatial resolution
Of what material is the filament made? - correct answers - Tungsten
Of what material is the target/anode made? - correct answers - Tungsten
What is added to port to remove the long-wavelength radiation? - correct
answers - aluminum filtration
What is the term used to describe the heating of a element to a hot
temperature and the expanding of the electrons in a atom? - correct answers
- Thermionic emission
The cathode side of the X-ray tube is - correct answers -
Negative The anode side of the X-ray tube is - correct
answers - Positive
What are the two rotation speeds for the anode? - correct answers -
3,600 rpm and 10,000 rpm
What type of radiation production makes up the greatest portion of the
X-ray beam- bremsstrahlung or characteristic? - correct answers -
Brehmsstrahlung
ANSWERS 2025
Roentgen discovered x-rays while working with a tube? - correct
answers - Crookes
An "electron cloud" surrounding the filament of the cathode is referred to
as a - correct answers - Space charge
Free electrons of X-ray production come from the - correct answers -
Filament
The creation of the space charge in the X-ray tube produces: - correct
answers - thermionic emission
The majority of photons in the X-ray beam are created by which
process? - correct answers - Bremsstrahlung interactions
More than 99% of the energy of the electron stream is converted into: -
correct answers
- heat
the high-speed rotation (10,000 rpm) of the anode enables - correct
answers - Greater dissipation of heat from high technical factors
The degree of angulation of the x-ray tube target will determine the: -
correct answers - size of the actual and effective focal spot
A dual-focus X-ray tube has:
1: Two filaments
2: Two focal spot sizes
3: Two anodes - correct answers - 1 and 2
The anode heel effect is a phenomenon of X-ray production that results
in: - correct answers - Uneven distribution of radiation within the x-ray
field
The penetrating power of the X-ray beam is controlled by varying the -
correct answers - Peak kilovoltage (kVp)
The rate flow of current flow across the X-ray tube is measured in - correct
answers - mA
, Doubling the mA will result in
1: increased patient dose
2: twice as many photons in the X-ray beam
3: increased radiographic density - correct answers - 1, 2, and 3
The unit used to indicate the total quantity of X-ray expose is - correct
answers - Millionsampere-seconds (mAs)
The device for removing long-wavelength radiation from the primary X-ray
beam is the - correct answers - Filter
X-ray equipment capable of producing 70 kVp or more is required to have
total filtration of at least: - correct answers - 2.5 mm Al equiv
The purpose of rotating the anode of the X-ray tube is to - correct answers
- Increase the heat capacity of the anode
Image sharpness is determined by the - correct answers - Size of the
effective focal spot
Above 70 kVp, what percentage of photons is created by the bremsstrahlung
process? - correct answers - 85%
The amount detail seen in the X-ray image is referred to as - correct
answers - spatial resolution
Of what material is the filament made? - correct answers - Tungsten
Of what material is the target/anode made? - correct answers - Tungsten
What is added to port to remove the long-wavelength radiation? - correct
answers - aluminum filtration
What is the term used to describe the heating of a element to a hot
temperature and the expanding of the electrons in a atom? - correct answers
- Thermionic emission
The cathode side of the X-ray tube is - correct answers -
Negative The anode side of the X-ray tube is - correct
answers - Positive
What are the two rotation speeds for the anode? - correct answers -
3,600 rpm and 10,000 rpm
What type of radiation production makes up the greatest portion of the
X-ray beam- bremsstrahlung or characteristic? - correct answers -
Brehmsstrahlung
