A modified quadrupole gradient set for use in high resolution MRI tagging.
A special purpose gradient set with a Cos(2 theta) current distribution has been constructed for high resolution MR imaging of small samples in a clinical Signa 1.5 T scanner using the existing gradient amplifiers. The X, Y, and Z gradient coils can attain gradient field strengths of 11.3, 4.7, and 15.2 G/cm at 100 amps current, respectively, with a slew rate of 20 G/cm/ms and usable ramp time of 150 microseconds. Field distortions are less than 2% over the central 8 cm of the bore, suitable for high resolution tagging of isolated canine hearts.
O'Dell
W G
WG
Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Schoeniger
J S
JS
Blackband
S J
SJ
McVeigh
E R
ER
D000818:Animals; D004285:Dogs; D006321:Heart / Q000033:anatomy & histology; D007089:Image Enhancement / Q000379:methods; D066298:In Vitro Techniques; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*