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AJNR - American Journal of Neuroradiology

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Comparison of Fluid-attenuated Inversion-recovery MR Imaging with CT in a Simulated Model of Acute Subarachnoid Hemorrhage

Kyo Noguchi^,a, Hikaru Seto^a, Yuichi Kamisaki^a, Gakuto Tomizawa^a, Shinichiro Toyoshima^a and Naoto Watanabe^a

^a From the Department of Radiology, Toyama Medical and Pharmaceutical University, Toyama, Japan.

View larger version (32K): [in a new window]   FIG 1. CSF (Hct, 0%) and each simulated SAH (ranging from Hct 4.5% to 45%). A, CT scan. B, Turbo-FLAIR image (9000/119 [TR/effective TE]; inversion time, 2200 ms).

View larger version (19K): [in a new window]   FIG 2. Plots of simulated SAH:CSF ratio versus Hct (%)

View larger version (17K): [in a new window]   FIG 3. Plots of CT value (in HU) versus Hct (%) and correlation with the average CT value of the normal cortical gray matter

View larger version (45K): [in a new window]   FIG 4. T2 relaxation curves of normal cortical gray matter, CSF (Hct, 0%), and each simulated SAH (ranging from Hct 4.5% to 45%) as a function of effective TE for a specific inversion time (2200 ms) and TR (9000) in a turbo-FLAIR sequence by using a theoretical equation for turbo inversion recovery signal intensity