期刊
MAGNETIC RESONANCE IN MEDICINE
卷 69, 期 4, 页码 981-991出版社
WILEY
DOI: 10.1002/mrm.24326
关键词
dynamic susceptibility contrast; transverse relaxation rate constant; hysteresis; microvasculature; perfusion
Perfusion measurements using dynamic susceptibility contrast imaging provide additional information about the mean vessel size of microvasculature when supplemented with a dual gradient echo (GE) - spin echo (SE) contrast. Dynamic increase in the corresponding transverse relaxation rate constant changes, Delta R-2GE and Delta R-2SE, forms a loop on the (Delta R-2SE(3/2), Delta R-2GE) plane, rather than a reversible line. The shape of the loop and the direction of its passage differentiate between healthy brain and pathological tissue, such as tumour and ischemic tissue. By considering a tree model of microvasculature, the direction of the loop is found to be influenced mainly by the relative arterial and venous blood volume, as well as the tracer bolus dispersion. A parameter Lambda is proposed to characterize the direction and shape of the loop, which might be considered as a novel imaging marker for describing the pathology of cerebrovascular network. Magn Reson Med 69:981-991, 2013. (C) 2012 Wiley Periodicals, Inc.
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