Tomoko Maekawa^{1,2}, Masaaki Hori^{1}, Katsutoshi Murata^{3}, Christina Andica^{1}, Yutaka Ikenouchi^{1}, Shohei Fujita^{1}, Ryusuke Irie^{1,2}, Akifumi Hagiwara^{1,2}, Kamiya Kouhei^{1,2}, Koji Kamagata^{1}, Akihiko Wada^{1}, and Shigeki Aoki^{1}

We investigated the DTI eigenvalues and MD of five types of meningioma acquired with a shorter diffusion time using an OGSE sequence. Eleven meningiomas that consisted of 4 meningothelial meningiomas, 2 fibrous meningiomas, 2 transitional meningiomas, 1 psammomatous meningioma, and 2 atypical meningiomas were analyzed. Our results showed that the psammomatous and atypical meningiomas had a relatively strong diffusion time-dependence of diffusion tensor metrics. The use of shorter diffusion time with DTI provide additional information about the microstructure of each meningioma subtypes.

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Figure 1. Representative cases of meningiomas. After contrast administration, all meningiomas demonstrate homogeneous enhancement. The meningiomas showed high intensity on DWI using PGSE. The meningiomas showed slightly decreased visualization on DWI using OGSE. MD of meningiomas showed slightly higher on OGSE, compared with those on PGSE.

Figure 2. The mean values of DTI eigenvalues (λ1, λ2, and λ3) and MD with the relative percentage changes for meningiomas. Among all types of meningioma, the psammomatous meningioma had the strongest diffusion time-dependence of DTI eigenvalues and MD, followed by and the atypical meningiomas.