ARRT MRI STUDY GUIDE SUMMARY 2026
ACTUAL EXAM QUESTIONS WITH 100%
CORRECT VERIFIED SOLUTIONS
◉B-Value . Answer: factor in diffusion weighted imaging
higher b-value = stronger diffusion weighting
◉Active Shielding . Answer: containment of static magnetic fringe field
through use of secondary coils attached around MRI scanner
◉Passive Shielding . Answer: Lining of the MRI room with
steel/ferromagnetic plating, reducing the scope/distance of the fringe
field
◉Passive Shimming . Answer: Shimming of magnetic field with metal
pieces either within or on the outer surface of the bore
Purpose of a more homogenous magnetic field
◉Diffusion . Answer: the movement of atoms or molecules from an area
of higher concentration to area of lower concentration
, ◉Frequency-Encoding . Answer: the process of locating an MR signal in
one dimension by applying a magnetic field gradient along that
dimension during the period when the signal is being received, utilizing
differences in frequencies along the same row in order to spatially
differentiate one location from another
◉Phase-Encoding . Answer: the process of locating an MR signal along
the phase axis, directly correlating spatial resolution and scan time with
the number of phase encodings in an MR image
◉Half-Fourier . Answer: Due to the symmetry of the matrix to be
sampled, a little more than half of the raw data is necessary to be
acquired, reconstructing the remaining data to complete the image
greatly reduces scan time
◉Proton Density weighting . Answer: an image minimizing t1 and t2
effects, with contrast primarily dependent upon the density of protons in
the imaging volume
◉Image Resolution . Answer: The ability to differentiate adjacent tissue
structures. Higher image resolution increases detection of smaller
pathologies. Resolution increases with smaller FOV, higher matrix, and
thinner slices
ACTUAL EXAM QUESTIONS WITH 100%
CORRECT VERIFIED SOLUTIONS
◉B-Value . Answer: factor in diffusion weighted imaging
higher b-value = stronger diffusion weighting
◉Active Shielding . Answer: containment of static magnetic fringe field
through use of secondary coils attached around MRI scanner
◉Passive Shielding . Answer: Lining of the MRI room with
steel/ferromagnetic plating, reducing the scope/distance of the fringe
field
◉Passive Shimming . Answer: Shimming of magnetic field with metal
pieces either within or on the outer surface of the bore
Purpose of a more homogenous magnetic field
◉Diffusion . Answer: the movement of atoms or molecules from an area
of higher concentration to area of lower concentration
, ◉Frequency-Encoding . Answer: the process of locating an MR signal in
one dimension by applying a magnetic field gradient along that
dimension during the period when the signal is being received, utilizing
differences in frequencies along the same row in order to spatially
differentiate one location from another
◉Phase-Encoding . Answer: the process of locating an MR signal along
the phase axis, directly correlating spatial resolution and scan time with
the number of phase encodings in an MR image
◉Half-Fourier . Answer: Due to the symmetry of the matrix to be
sampled, a little more than half of the raw data is necessary to be
acquired, reconstructing the remaining data to complete the image
greatly reduces scan time
◉Proton Density weighting . Answer: an image minimizing t1 and t2
effects, with contrast primarily dependent upon the density of protons in
the imaging volume
◉Image Resolution . Answer: The ability to differentiate adjacent tissue
structures. Higher image resolution increases detection of smaller
pathologies. Resolution increases with smaller FOV, higher matrix, and
thinner slices
