一种用于高分辨率磁共振成像标记的改良四极梯度装置。
A modified quadrupole gradient set for use in high resolution MRI tagging.
作者信息
O'Dell W G, Schoeniger J S, Blackband S J, McVeigh E R
机构信息
Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
出版信息
Magn Reson Med. 1994 Aug;32(2):246-50. doi: 10.1002/mrm.1910320215.
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.
利用现有的梯度放大器，在临床Signa 1.5 T扫描仪中构建了一种具有Cos(2θ)电流分布的特殊用途梯度集，用于对小样本进行高分辨率磁共振成像。X、Y和Z梯度线圈在100安培电流下，分别可达到11.3、4.7和15.2 G/cm的梯度场强， slew率为20 G/cm/ms，可用斜坡时间为150微秒。在孔径中心8厘米范围内，场畸变小于2%，适用于对离体犬心脏进行高分辨率标记。
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