Temporal change of bloody fluid with apparent diffusion coefficient and T1-/ T2-relaxation time in a phantom study.
Tomohiro Namimoto 1 , Kosuke Morita 1 , Yuuki Kizaki 1 , Toshinori Hirai 1 , Makoto Gotoh 2 , Yukimi Waki 2 , Ryo Itatani 1 , and Yasuyuki Yamashita 1
Diagnostic Radiology, Kumamoto University,
Kumamoto, Kumamoto, Japan,
University Hospital, Kumamoto, Japan
We compared apparent diffusion coefficients (ADCs) with
T1-/T2-relaxation time in a phantom study. Blood
phantoms were gradually diluted with saline. MR
measurements were performed with T1-/T2-calculations and
ADCs from 0.2 hour to 7 days. T1-relaxation time
cumulatively increased and subsequently plateaued.
T2-relaxation time increased, and then decreased. ADC
slightly decreased during whole times. T1-relaxation
time and ADC was almost proportional decreased as blood
concentration decreased; T2-relaxation time was almost
inversely proportional decreased. Temporary change of
ADCin bloody fluid was poorly correlated with that of
T1-/T2-relaxation time. ADC is almost linearly dependent
on blood concentration and almost independent of
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