ARRT Registry Review Questions with
Answers 100% Correct
The line focus principle expresses the relationship between ✔✔ the actual focal spot and the
effective focal spot
Although the stated focal spot size is measured directly under the actual focal spot, focal spot
size actually varies along the length of the x-ray beam. At which portion of the x-ray beam is the
effective focal spot the smallest ✔✔ anode end
design characteristics of x-ray tube targets that determine heat capacity include ✔✔ the
rotation of the anode, diameter of the anode, and size of the focal spot
the electron cloud within the x-ray tube is the product of a process called ✔✔ thermionic
emission
delivery of large exposures to a cold anode or the use of exposures exceeding tube limitation
can result in ✔✔ cracking of the anode and rotor bearing damage
as electrons impinge on the anode surface, less than 1% of their kinetic energy is changed to
✔✔ x-rays
conditions that contribute to x-ray tube damage include ✔✔ lengthy anode rotation and
exposures to a cold anode
characteristics of the metallic element tungsten include ✔✔ ready dissipation of heat, high
melting point, and high atomic number
,an AEC device can operate on which of the following principles ✔✔ a PMT charged by a
fluorescent screen and a parallel-plate ionization chamber charged by x-ray photons
the type of AEC device most commonly used is a ✔✔ ionization chamber
the AEC backup timer functions to ✔✔ protect the patient from overexposure and protect the x-
ray tube from excessive heat
the voltage ripple associated with a three-phase/12 pulse-rectified generator is about ✔✔ 4%
circuit devices that permit electrons to flow in only one direction are ✔✔ solid-state diodes
if the primary coil of a high-voltage transformer is supplied by 220V and has 400 turns and the
secondary coil has 100,000 turns, what is the voltage induced in the secondary coil ✔✔ 55 kv
a device used to ensure reproducible radiographs, regardless of tissue density variations, is the
✔✔ automatic exposure control
accurate operation of the AEC device depends on ✔✔ positioning of the object with respect to
the photocell and beam restriction
what is located between the secondary coil of the high voltage transformer and the x-ray tube
✔✔ filament circuit
image resolution improves as ✔✔ DEL size decreases and fill factor increases
, as digital image matrix size increases ✔✔ Pixel size decreases, resolution increases, pixel depth
increases
the luminescent light emitted by the PSP is transformed into the image seen on the CRT
(cathode ray tube) by the ✔✔ ADC
potential digital image postprocessing tasks include ✔✔ annotation and inversion/reversal
computed radiography resolution increases as ✔✔ laser beam size decreases and PSP crystal
size decreases
what pixel size has a 512 x 512 matrix with a 20-cm FOV ✔✔ 0.40 mm/pixel
the differences between CR and DR include ✔✔ CR uses IPs
As the size of the image matrix increases in digital imaging ✔✔ pixel size decreases and spatial
resolution increases
kv selection in digital imaging has an effect on ✔✔ photon energy and penetration
digital radiographic imaging equipment provides a number of functions for optimization of
image quality, including ✔✔ exposure data recognition and automatic rescaling
which system functions to compensate for changing patient/part thicknesses during
fluoroscopic procedures ✔✔ automatic brightness control
Answers 100% Correct
The line focus principle expresses the relationship between ✔✔ the actual focal spot and the
effective focal spot
Although the stated focal spot size is measured directly under the actual focal spot, focal spot
size actually varies along the length of the x-ray beam. At which portion of the x-ray beam is the
effective focal spot the smallest ✔✔ anode end
design characteristics of x-ray tube targets that determine heat capacity include ✔✔ the
rotation of the anode, diameter of the anode, and size of the focal spot
the electron cloud within the x-ray tube is the product of a process called ✔✔ thermionic
emission
delivery of large exposures to a cold anode or the use of exposures exceeding tube limitation
can result in ✔✔ cracking of the anode and rotor bearing damage
as electrons impinge on the anode surface, less than 1% of their kinetic energy is changed to
✔✔ x-rays
conditions that contribute to x-ray tube damage include ✔✔ lengthy anode rotation and
exposures to a cold anode
characteristics of the metallic element tungsten include ✔✔ ready dissipation of heat, high
melting point, and high atomic number
,an AEC device can operate on which of the following principles ✔✔ a PMT charged by a
fluorescent screen and a parallel-plate ionization chamber charged by x-ray photons
the type of AEC device most commonly used is a ✔✔ ionization chamber
the AEC backup timer functions to ✔✔ protect the patient from overexposure and protect the x-
ray tube from excessive heat
the voltage ripple associated with a three-phase/12 pulse-rectified generator is about ✔✔ 4%
circuit devices that permit electrons to flow in only one direction are ✔✔ solid-state diodes
if the primary coil of a high-voltage transformer is supplied by 220V and has 400 turns and the
secondary coil has 100,000 turns, what is the voltage induced in the secondary coil ✔✔ 55 kv
a device used to ensure reproducible radiographs, regardless of tissue density variations, is the
✔✔ automatic exposure control
accurate operation of the AEC device depends on ✔✔ positioning of the object with respect to
the photocell and beam restriction
what is located between the secondary coil of the high voltage transformer and the x-ray tube
✔✔ filament circuit
image resolution improves as ✔✔ DEL size decreases and fill factor increases
, as digital image matrix size increases ✔✔ Pixel size decreases, resolution increases, pixel depth
increases
the luminescent light emitted by the PSP is transformed into the image seen on the CRT
(cathode ray tube) by the ✔✔ ADC
potential digital image postprocessing tasks include ✔✔ annotation and inversion/reversal
computed radiography resolution increases as ✔✔ laser beam size decreases and PSP crystal
size decreases
what pixel size has a 512 x 512 matrix with a 20-cm FOV ✔✔ 0.40 mm/pixel
the differences between CR and DR include ✔✔ CR uses IPs
As the size of the image matrix increases in digital imaging ✔✔ pixel size decreases and spatial
resolution increases
kv selection in digital imaging has an effect on ✔✔ photon energy and penetration
digital radiographic imaging equipment provides a number of functions for optimization of
image quality, including ✔✔ exposure data recognition and automatic rescaling
which system functions to compensate for changing patient/part thicknesses during
fluoroscopic procedures ✔✔ automatic brightness control
