T1 AND T2 MEASUREMENTS ON A 1.5-T COMMERCIAL MR IMAGER
T1 AND T2 MEASUREMENTS ON A 1.5-T COMMERCIAL MR IMAGER
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DOI：
10.1148/radiology.171.1.2928538
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发表时间：
1989-04-01
期刊：
影响因子：
19.7
通讯作者：
HAUGHTON, VM
中科院分区：
文献类型：
--
作者：
BREGER, RK;RIMM, AA;HAUGHTON, VM
为了将弛豫时间用于临床诊断，必须确定测量的精确度。作者在体模和人类志愿者中测量了T1、T2和质子密度，以确定该方法的重复性。在两次软件升级的15个月期间，模体中T1测量的变异系数为5%。任何给定软件的T2测量的方差都在4%或更低，在15个月的总体期间，如果有两个软件更改，T2的重复性在6%到9%之间。重复性足够高，临床上精确测量T1、T2和质子密度是可行的。
In order for relaxation times to be used in clinical diagnosis, the precision of the measurement must be determined. The authors measured T1, T2, and proton density in a phantom and in human volunteers to determine the reproducibility of the method. The coefficient of variance of T1 measurements in the phantom during a 15-month period with two software upgrades was 5%. Variance of T2 measurements with any given software was 4% or less, and overall in the 15-month period, with two software changes, the T2 reproducibility was between 6% and 9%. The reproducibility is sufficiently high that precise clinical measurements of T1, T2, and proton density are feasible.