Cerebral blood flow change during postcibal hypotension. Comparison between multiple system atrophy and pure autonomic failure

Abstract

The Diffusion Status of Metabolites in Human Brain: Measured Using Proton Diffusion MR Spectroscopy. Fan~, Rand . Nishitani Rlrnmul, Fllrnkl~u Mivoshi.Ms~afnmi HIrada.Ohl~nka |lidekl. I.Dgpl. of Radiology,XiJing Hospital.The Fourth Military Medical University giaa (710032),P.R.of China 2.Dept. of Radioiog~,,Medicai SchooI,Tokushima University, Tokushima,lapan Mmterl=l, and Methndl: The water suppressed STEAM sequence were used for localized diffusion measurement in 5 normal human brain in viva The diffusion gradients(2.4.and 6 roT/M) were applied during the TFJ2 period. corresponding the b factors as 72,285,and 642 s/ramS.Other parameters including the TE=68ms,TM=200ms,TK = 1625ms and 256 acquisition.The signal intensity of NAA ,Cho,and Cr were measured and the diffusion coefficient (D) were calculated according the equation D=Ln(SIIS0y(bl-bO) [l~nla:The diffusion coefficient of NAA,Cho and Cr were list in follow table table: The Diffusion Coefficient of NAA,Cho and Cr in the normal human brain white matter.(unit:10 -3 mm2/sec)