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Abstract #4499

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

1 Diagnostic Radiology, Kumamoto University, Kumamoto, Kumamoto, Japan, 2 Kumamoto 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 T1-/T2-relaxation times.

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