Measurement of tissue oxygen extraction ratios from venous blood T2:: Increased precision and validation of principle

被引:103
作者
Golay, X
Silvennoinen, MJ
Zhou, JY
Clingman, CS
Kauppinen, RA
Pekar, JJ
van Zijl, PCM
机构
[1] Kennedy Krieger Inst, FM Kirby Res Ctr Funct Brain Imaging, Baltimore, MD 21205 USA
[2] Johns Hopkins Univ, Sch Med, Dept Radiol, Baltimore, MD 21205 USA
[3] Univ Kuopio, AI Virtanen Inst Mol Sci, FIN-70211 Kuopio, Finland
关键词
BOLD contrast; T-2; quantification; OER;
D O I
10.1002/mrm.1189
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
It has recently been shown that parenchymal oxygen extraction ratios (OERs) can be quantified using the absolute T-2 of venous blood draining from this tissue (Oja et al., J Cereb Blood Flow Metab 1999;19:1289-1295). Here, a modified Carr-Purcell-Meiboom-Gill (CPMG) multiecho experiment was used to increase the efficiency and precision of this approach and to test the applicability of the two-compartment exchange model for spinecho BOLD effects in pure venous blood. Relaxation measurements on bovine blood as a function of CPMG interecho spacing, oxygen saturation, and hematocrit provided the baseline relaxation and susceptibility shift parameters necessary to directly relate OER to T-2 of venous blood in vivo. Using an interecho spacing of 25 ms, the results on visual activation studies in eight volunteers showed T-2(CPMG) values increasing from 128 +/- 9 ms to 174 +/- 18 ms upon activation, corresponding to local DER values of 0.38 +/- 0.04 and 0.18 +/- 0.05 during baseline activity and visual stimulation, respectively. These OER values are in good agreement with literature data on venous oxygenation and numbers determined previously using a single-echo approach, while the measured T(2)s are about 20-40 ms longer. (C) 2001 Wiley-Liss, Inc.
引用
收藏
页码:282 / 291
页数:10
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