MRI PHYSICS FINAL EXAM WITH COMPLETE SOLUTIONS

MRI PHYSICS FINAL EXAM WITH
COMPLETE SOLUTIONS

A T1 weighted spin echo image is produced by using a pulse sequence with ________ TE time
and a ______ TR time. Correct Ans-short, short



A T2 weighted spin echo image is produced by using a pulse sequence with ______ TE time and
a _______ TR time. Correct Ans-long, long



A proton density weighted spin echo image is produced by using a pulse sequence with ______
TE time and a _______ TR time. Correct Ans-short, long




The pulse sequence most often used to nullify the signal from adipose tissue is Correct Ans-
STIR



The fastest MRI pulse sequence is Correct Ans-echo planner




Name all the ways you can improve the SNR for a spin echo image. Correct Ans-Thick slice

More NEX

Greater magnet strength

Larger pixel size

, The 180 degree-90 degree- 180 degree RF pulse sequence is employed in Correct Ans-
inversion recovery



The reconstruction technique used for most MRI image is Correct Ans-2DFT




As the magnetic field strength increases, the ____________ parameter also increases Correct
Ans-T1



The scan time for a spin echo pulse sequence depends on all of the following: Correct Ans-
NEX

TR

# of phase encodings

Use of Fourier symmetry



The spatial resolution in body MRI images is about Correct Ans-0.7 LP/mm




In MRI, ______ gradient is on when the RF is applied Correct Ans-slice selection gradient



_______________ MRI artifacts are repeated low- intensity images in the phase-encoding
direction Correct Ans-Motion ghost



_____________ MRI artifacts cause images wrap around to the opposite side and overlap other
parts of the anatomy. Correct Ans-Aliasing