ARRT Registry Exam 2024-2025 New Latest Version
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Actual Past Exam and Correct Answers
which of the following are byproducts of photoelectric absorption?
a. photoelectron and Compton scattered electron
b. photoelectron and characteristic photon
c. low energy scattererd xray photon and characteristic photon
d. low energy scattered xray photon and compton scattered electron ----------- Correct Answer ---
-------- b. photoelectron and characteristic photon
If a digital imaging system can record 10 lines per millimeter, what is its spatial resolution?
a. 1 lp/mm
b. 5 lp/mm
c. 10 lp/mm
d. 20 lp/mm ----------- Correct Answer ----------- b. 5 lp/mm
(it takes 2 lines to make a pair. 10 divided by 2=5 lp/mm)
what is the average pulse rate for an infant? ---------- Correct Answer ------------ 70-120 bpm
what is a sphygmomanometer used for? ---------- Correct Answer ------------ taking blood
pressure
as wavelength increases, frequency ________ ---------- Correct Answer ------------ decreases
_____ resistors are placed end-to-end, whereas ______ resistors are placed side-by-side ----------
Correct Answer ------------ series; parallel
if current is pointing toward you, what direction is the magnetic field? ---------- Correct Answer -
----------- clockwise
what word defines the changing of alternating current to direct current? ---------- Correct Answer
------------ rectification
what is the unit of electrical power? ---------- Correct Answer ------------ watt
Which position/projection is necessary to demonstrate the intervertebral foramina of the cervical
spine?
a. PA or AP axial obliques
b. AP axial
c. lateral
d. odontoid ----------- Correct Answer ----------- a. PA or AP axial obliques
Generally, how much must a digital image receptor be overexposed in order to produce
,saturation?
a. 1 X
b. 2 X
c. 3 X
d. 4 X ----------- Correct Answer ----------- d. 4 X
which two interactions between x-radiation and matter result in the production of small-angle
scatter?
a. coherent scattering and Compton scattering
b. coherent scattering and pair production
c. photoelectric absorption and Compton scattering
c. photoelectric absorption and pair production ----------- Correct Answer ----------- a. coherent
scattering and Compton scattering
which of the following interactions results in the conversion of matter into energy?
a. modified scattering
b. photoelectric absorption
c. annihilation reaction
d. classical scattering ----------- Correct Answer ----------- c. annihilation reaction
CR for AP axial sigmoid? ----------- Correct Answer ----------- 30-40 degrees cephalic, 2 inches
below the ASIS
During the process of coherent scattering, the incident x-ray photon interacts with a(n):
a. atom transferring its energy by causing some or all of the electrons of the atom to vibrate
momentarily and radiate energy in the form of electromagnetic waves
b. single inner shell electron, ejecting it from its orbit
c. single outer shell electron, ejecting it from its orbit
d. scattered photon of lesser energy, annihilating it ----------- Correct Answer ----------- a. atom
transferring its energy by causing some or all of the electrons of the atom to vibrate momentarily
and radiate energy in the form of electromagnetic waves
Particles associated with electromagnetic radiation that have no mass or electric charge are:
a. positrons
b. x-ray photons
c. negatrons
d. ions ----------- Correct Answer ----------- b. x-ray photons
The x-ray photon energy required to initiate pair production is:
a. 1.022 MeV
b. 0.511 MeV
c. 1.022 keV
d. 0.511 keV ----------- Correct Answer ----------- a. 1.022 MeV
Radiographic density is:
a. not affected by milliampere-seconds (mAs)
,b. caused by photodisintegration
c. defined as the degree of overall blackening on a completed radiograph
d. not relevant in the production of a diagnostic radiograph ----------- Correct Answer ----------- c.
defined as the degree of overall blackening on a completed radiograph
X-rays are carriers of:
a. fluorescent properties that make them visible
b. electrons
c. disease
d. manmade, electromagnetic energy ----------- Correct Answer ----------- d. manmade,
electromagnetic energy
Differences in density level between radiographic images of adjacent structures as seen in a
completed radiograph define:
a. photodisintegration
b. radiographic density
c. image attenuation
d. radiographic contrast ----------- Correct Answer ----------- d. radiographic contrast
The probability of occurrence of photoelectric absorption _________ as the energy of the
incident photon decreases and the atomic number of the irradiated atoms _________.
a. decreases markedly, increases
b. increases markedly, decreases
c. increases markedly, increases
d. stays the same, increases ----------- Correct Answer ----------- c.
increases markedly, increases
The symbol Z indicates the:
a. atomic weight of an atom
b. atomic number of an atom
c. number of vacancies in an atomic shell
d. fluorescent yield ----------- Correct Answer ----------- b. atomic number of an atom
CR for AP upright KUB? ----------- Correct Answer ----------- 2-3 inches above the iliac crest
What is the term for the number of x-rays emitted per inner-shell vacancy during the process of
photoelectric absorption?
a. Characteristic absorption
b. Fluorescent yield
c. Modified pair production
d. Classical gain ----------- Correct Answer ----------- b. Fluorescent yield
What is the effective atomic number of compact bone? ----------- Correct Answer ----------- 13.8
Compton scattering is synonymous with:
a. coherent scattering
, b. photoelectric absorption
c. incoherent scattering
d. photodisintegration ----------- Correct Answer ----------- c. incoherent scattering
Which of the following is not another term for coherent scattering?
a. Classical
b. Elastic
c. Unmodified
d. Characteristic ----------- Correct Answer ----------- d. characteristic
Which of the following is not a type of interaction between x-radiation and biologic matter?
a. Compton scattering
b. Bremsstrahlung
c. Pair production
d. Photoelectric absorption ----------- Correct Answer ----------- b. Bremsstrahlung
According to the NCRP Report #160,
a. individual effective doses have nearly quadrupled since the early 1980s.
b. individual exposures have increased principally due to increased utilization of digital imaging
technologies.
c. the effective dose per individual in the United States primarily increased because of increased
fluoroscopic interventional procedures and CT scans.
d. individual exposures have decreased due to improved technology and more discrete
utilization. ----------- Correct Answer ----------- c. the effective dose per individual in the United
States primarily increased because of increased fluoroscopic interventional procedures and CT
scans.
How long does the prodromal stage of acute radiation syndrome generally last?
a. A few hours to several days
b. Months
c. Less than an hour
d. Many years ----------- Correct Answer ----------- a. A few hours to several days
What occurs as the number of photoelectric interactions increase?
a. Absorbed dose increases
b. Potential for biologic damage increases
c. Radiographic contrast changes
d. All of the above ----------- Correct Answer ----------- d. all of the above
Alpha is what form of ionizing radiation? ----------- Correct Answer ----------- particulate
What can happen when the metabolic activity of cells increases as a result of irradiation?
a. Cell reproduction ceases
b. Cells reproduce more rapidly
c. Cells atrophy
d. Cell fluid viscosity decreases ----------- Correct Answer ----------- b. Cells reproduce more
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