MRI PHYSICS FINAL Exam 2024/2025(Questions With
100% Correct Answers)A+ Graded Verified
Nuclei that have the strongest magnetic moments are those with - ANSWER only
hydrogen
The Larmor frequency of nuclei depends on: - ANSWER # of protons and neutrons in
the nucleus
gyromagnetic ratio
main magnetic field strength
molecule in which nuclei are located
The spin-lattice relaxation time in MRI is also called the - ANSWER longitudinal
relaxation time
The shortest relaxation time in MRI is the - ANSWER t2*
The coil that provides the best signal to noise ratio is the - ANSWER surface coil
The relaxation time that controls the FID is the - ANSWER t2*
Cryogenic superconductive magnets have their electrical windings cooled by -
ANSWER liquid helium
The Larmor frequency of hydrogen nuclei at 1.5T is about - ANSWER 63.9 MHz
The brightest signal from a T2- weighted spin echo MRI image would be from -
ANSWER pure water (3000 ms)
The brightest signal from a T1- weighted spin echo MRI image would be from -
ANSWER adipose tissue (180 ms)
A T1 weighted spin echo image is produced by using a pulse sequence with ________ TE
time and a ______ TR time. - ANSWER short, short
A T2 weighted spin echo image is produced by using a pulse sequence with ______ TE
time and a _______ TR time. - ANSWER long, long
A proton density weighted spin echo image is produced by using a pulse sequence with
______ TE time and a _______ TR time. - ANSWER short, long
The pulse sequence most often used to nullify the signal from adipose tissue is -
ANSWER STIR
100% Correct Answers)A+ Graded Verified
Nuclei that have the strongest magnetic moments are those with - ANSWER only
hydrogen
The Larmor frequency of nuclei depends on: - ANSWER # of protons and neutrons in
the nucleus
gyromagnetic ratio
main magnetic field strength
molecule in which nuclei are located
The spin-lattice relaxation time in MRI is also called the - ANSWER longitudinal
relaxation time
The shortest relaxation time in MRI is the - ANSWER t2*
The coil that provides the best signal to noise ratio is the - ANSWER surface coil
The relaxation time that controls the FID is the - ANSWER t2*
Cryogenic superconductive magnets have their electrical windings cooled by -
ANSWER liquid helium
The Larmor frequency of hydrogen nuclei at 1.5T is about - ANSWER 63.9 MHz
The brightest signal from a T2- weighted spin echo MRI image would be from -
ANSWER pure water (3000 ms)
The brightest signal from a T1- weighted spin echo MRI image would be from -
ANSWER adipose tissue (180 ms)
A T1 weighted spin echo image is produced by using a pulse sequence with ________ TE
time and a ______ TR time. - ANSWER short, short
A T2 weighted spin echo image is produced by using a pulse sequence with ______ TE
time and a _______ TR time. - ANSWER long, long
A proton density weighted spin echo image is produced by using a pulse sequence with
______ TE time and a _______ TR time. - ANSWER short, long
The pulse sequence most often used to nullify the signal from adipose tissue is -
ANSWER STIR
