ASRT test questions on all 12 modules With Complete Solutions

ASRT test questions on all 12 modules Wi u u u u u u u




th Complete Solutions.
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The most common type of magnet used in today's MR systems is the ______________
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_.

A. resistive magnet
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B. permanent magnet
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C. superconducting magnet
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D. open MR scanner - Answer C. superconducting magnet
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The positively charged part of an atom is the _____________.
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A. electron
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B. neutron
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C. proton
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D. nucleus - Answer C. proton
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When a hydrogen nucleus is positively charged and spins, it generates a small magneti
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c field called a _____________.
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A. larmor equation
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B. decay moment
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C. proton moment
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D. magnetic moment - Answer D. magnetic moment
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When placed in an external magnetic field, low-
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energy hydrogen nuclei (protons) point in the ____________ direction.
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A. parallel
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B. perpendicular
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C. antiparallel
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D. random - Answer A. parallel
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Which of the following is used to describe the relationship between the static magnetic fi
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eld and the precessional frequency of the hydrogen protons?
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A. concept of precessing
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B. larmor equation
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C. theory of magnetism
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D. MR equation - Answer B. larmor equation
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What term describes hydrogen protons, nuclei rotating in unison?
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A. out-of-phase precession
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B. in-phase precession
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C. magnetic moment
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D. nucleus of atoms - Answer B. in-phase precession
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This process of applying RF energy to the patient in order to receive a signal from the pr
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otons in the body part being imaged is known as ______________.
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,ASRT test questions on all 12 modules Wi u u u u u u u




th Complete Solutions.
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A. alignment
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B. resonance
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C. precession
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D. gyromagnetic ratio - Answer B. resonance
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Superconductive MR scanners that use cryogen gases have what kind of fields? u u u u u u u u u u u u




A. vertical
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B. longitudinal
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C. horizontal
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D. transverse - Answer C. horizontal
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Which coil is located closes to the patient?
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A. magnet
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B. gradient
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C. shim
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D. radiofrequency - Answer D. radiofrequency
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When exposed to the magnetic field, a ___________ substance demonstrates a negati
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ve magnetic susceptibility, which means it is repelled by the magnetic field.
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A. ferromagnetic
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B. paramagnetic
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C. superparamagnetic
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D. diamagnetic - Answer D. diamagnetic
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Which of the following is a characteristic of ultra-high field magnets?
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A. signal-to-noise ratios are high and faster imaging times are possible.
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B. the scanner has an open design and large gantry aperture
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C. magnetic fringe fields are relatively small
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D. scanners are light and portable -
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Answer A. signal to noise ratios are high and faster imaging times are possible
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Which type of magnet varies in field strength from 0.5 to 1.4 tesla (T)?
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A. ultra-high field
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B. high field
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C. midfield
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D. low field - Answer C. midfield
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Which of the following is an appropriate use of low-field magnets?
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A. orthopedic studies
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B. chemical saturation imaging
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C. neurovascular studies
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, ASRT test questions on all 12 modules Wi u u u u u u u




th Complete Solutions.
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D. intraoperative imaging - Answer A. orthopedic studies
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Which is the most common electromagnet configuration?
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A. permanent
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B. resistive
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C. superconducting
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D. niche - Answer C. superconducting
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Which of the following is a disadvantage of superconducting magnets?
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A. high operational costs
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B. low field strength
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C. expensive to purchase
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D. vertical magnetic field - Answer C. expensive to purchase
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The magnet must be shimmed before imaging sequences to:
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A. match the precessional frequency of hydrogen
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B. increase the strength of the radiofrequency pulse
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C. create a uniform magnetic field
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D. decrease the fringe field - Answer C. create a uniform magnetic field
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The location of an electron excited by magnetic fields and radiofrequency pulses can be
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determined using ____________ and an x, y, z, coordinate system.
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A. x-rays
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B. waveforms
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C. gradients
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D. microwaves - Answer C. gradients
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Which of the following factors can change the strength of an electromagnet? 1. the num
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ber of loops in the electromagnetic coil. 2. the current passing through the loops. 3. the s
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pacing of the loops. u u u u




A. 1 and 2
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B. 1 and 3
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C. 2 and 3
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D. 1, 2, and 3 - Answer D. 1, 2 and 3
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The _____________ coil is used to create homogeneity within the magnetic field.
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A. electromagnet
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B. RF
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C. z gradient
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D. shim - Answer D. shim
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The ____________ gradient locates the signal along the short axis of the anatomy.
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