LMRT ARRT EXAM Correct Questions &
Answers(RATED A+)
Roentgen discovered x-rays while working with a _____ tube? - ANSWER Crookes
An "electron cloud" surrounding the filament of the cathode is referred to as a -
ANSWER Space charge
Free electrons of X-ray production come from the - ANSWER Filament
The creation of the space charge in the X-ray tube produces: - ANSWER thermionic
emission
The majority of photons in the X-ray beam are created by which process? - ANSWER
Bremsstrahlung interactions
More than 99% of the energy of the electron stream is converted into: - ANSWER heat
the high-speed rotation (10,000 rpm) of the anode enables - ANSWER Greater
dissipation of heat from high technical factors
The degree of angulation of the x-ray tube target will determine the: - ANSWER 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 - ANSWER 1 and 2
The anode heel effect is a phenomenon of X-ray production that results in: - ANSWER
Uneven distribution of radiation within the x-ray field
The penetrating power of the X-ray beam is controlled by varying the - ANSWER Peak
kilovoltage (kVp)
The rate flow of current flow across the X-ray tube is measured in - ANSWER 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 - ANSWER 1, 2, and 3
, The unit used to indicate the total quantity of X-ray expose is - ANSWER
Millionsampere-seconds (mAs)
The device for removing long-wavelength radiation from the primary X-ray beam is the -
ANSWER Filter
X-ray equipment capable of producing 70 kVp or more is required to have total filtration
of at least: - ANSWER 2.5 mm Al equiv
The purpose of rotating the anode of the X-ray tube is to - ANSWER Increase the heat
capacity of the anode
Image sharpness is determined by the - ANSWER Size of the effective focal spot
Above 70 kVp, what percentage of photons is created by the bremsstrahlung process? -
ANSWER 85%
The amount detail seen in the X-ray image is referred to as - ANSWER spatial
resolution
Of what material is the filament made? - ANSWER Tungsten
Of what material is the target/anode made? - ANSWER Tungsten
What is added to port to remove the long-wavelength radiation? - ANSWER 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? - ANSWER Thermionic emission
The international systems of units (SI) unit for measuring the ABSORBED DOSE in the
patient is the - ANSWER gray-t (Gy-t)
The SI measurement of radiation EXPOSURE in Air is the - ANSWER gray-a (gy-a)
The SI unit used to report the EQUIVALENT DOSE, or occupational dose, to radiation
workers in the us is - ANSWER Sievert (Sv)
According to the Bergonie-Tribondeau law, the following types of cells are most
radiosensitive - ANSWER embryonic tissue cells
Short term effects of radiation are typically observed within - ANSWER 3 months
Which of the following is considered an observable short term effect of radiation
exposure - ANSWER erythema
Answers(RATED A+)
Roentgen discovered x-rays while working with a _____ tube? - ANSWER Crookes
An "electron cloud" surrounding the filament of the cathode is referred to as a -
ANSWER Space charge
Free electrons of X-ray production come from the - ANSWER Filament
The creation of the space charge in the X-ray tube produces: - ANSWER thermionic
emission
The majority of photons in the X-ray beam are created by which process? - ANSWER
Bremsstrahlung interactions
More than 99% of the energy of the electron stream is converted into: - ANSWER heat
the high-speed rotation (10,000 rpm) of the anode enables - ANSWER Greater
dissipation of heat from high technical factors
The degree of angulation of the x-ray tube target will determine the: - ANSWER 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 - ANSWER 1 and 2
The anode heel effect is a phenomenon of X-ray production that results in: - ANSWER
Uneven distribution of radiation within the x-ray field
The penetrating power of the X-ray beam is controlled by varying the - ANSWER Peak
kilovoltage (kVp)
The rate flow of current flow across the X-ray tube is measured in - ANSWER 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 - ANSWER 1, 2, and 3
, The unit used to indicate the total quantity of X-ray expose is - ANSWER
Millionsampere-seconds (mAs)
The device for removing long-wavelength radiation from the primary X-ray beam is the -
ANSWER Filter
X-ray equipment capable of producing 70 kVp or more is required to have total filtration
of at least: - ANSWER 2.5 mm Al equiv
The purpose of rotating the anode of the X-ray tube is to - ANSWER Increase the heat
capacity of the anode
Image sharpness is determined by the - ANSWER Size of the effective focal spot
Above 70 kVp, what percentage of photons is created by the bremsstrahlung process? -
ANSWER 85%
The amount detail seen in the X-ray image is referred to as - ANSWER spatial
resolution
Of what material is the filament made? - ANSWER Tungsten
Of what material is the target/anode made? - ANSWER Tungsten
What is added to port to remove the long-wavelength radiation? - ANSWER 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? - ANSWER Thermionic emission
The international systems of units (SI) unit for measuring the ABSORBED DOSE in the
patient is the - ANSWER gray-t (Gy-t)
The SI measurement of radiation EXPOSURE in Air is the - ANSWER gray-a (gy-a)
The SI unit used to report the EQUIVALENT DOSE, or occupational dose, to radiation
workers in the us is - ANSWER Sievert (Sv)
According to the Bergonie-Tribondeau law, the following types of cells are most
radiosensitive - ANSWER embryonic tissue cells
Short term effects of radiation are typically observed within - ANSWER 3 months
Which of the following is considered an observable short term effect of radiation
exposure - ANSWER erythema
