Tomoyuki Noguchi1, Masatou Kawashima2, Masashi Nishihara3, Yoshiaki Egashira4, Shinya Azama5, Hiroyuki Irie6. 1. Department of Radiology, National center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo 162-8655, Japan; Department of Radiology, Faculty of Medicine and Graduate School of Medicine, Saga University, 5-1-1, Nabeshima, Saga 849-8501, Japan(1). Electronic address: tnogucci@radiol.med.kyushu-u.ac.jp. 2. Department of Neurosugery, Faculty of Medicine and Graduate School of Medicine, Saga University, 5-1-1, Nabeshima, Saga 849-8501, Japan(1). Electronic address: m996kawa@cc.saga-u.ac.jp. 3. Department of Radiology, Faculty of Medicine and Graduate School of Medicine, Saga University, 5-1-1, Nabeshima, Saga 849-8501, Japan(1). Electronic address: nishiham@cc.saga-u.ac.jp. 4. Department of Radiology, Faculty of Medicine and Graduate School of Medicine, Saga University, 5-1-1, Nabeshima, Saga 849-8501, Japan(1). Electronic address: bunta1974@yahoo.co.jp. 5. Department of Radiology, Faculty of Medicine and Graduate School of Medicine, Saga University, 5-1-1, Nabeshima, Saga 849-8501, Japan(1). Electronic address: azama-ssam-71257@b2.bunbun.ne.jp. 6. Department of Radiology, Faculty of Medicine and Graduate School of Medicine, Saga University, 5-1-1, Nabeshima, Saga 849-8501, Japan(1). Electronic address: irie@cc.saga-u.ac.jp.
Abstract
PURPOSE: To project a noninvasive method for mapping cerebrovascular reserve (CVR) in moyamoya disease (MMD) using ASL-MRI. METHODS: 16 MMD patients underwent cerebral blood flow (CBF) examinations by standard ASL-MRI, pulse-wave-synchronized ASL-MRI (pulsy ASL-MRI) which tagged the arterial blood coincident with a peak of a pulse wave, and single photon emission computed tomography (SPECT) imagings with iodine-123-N-isopropyl-p-iodoamphetamine in the resting (rest-IMP) and after acetazolamide challenge (ACZ-IMP). Hemispheric 32-sided cerebral blood flow (CBF) values were measured with normalized CBF maps created from standard ASL-MRI (standard-ASL value), pulsy ASL-MRI (pulsy-ASL value), rest-IMP (rest-IMP value), and ACZ-IMP (ACZ-IMP value). CVR based on rest-IMP and ACZ-IMP values (IMP-CVR) was calculated. ASL-CVR was also calculated on the basis of corrected standard-ASL values and pulsy-ASL values, which were adjusted to the ACZ-IMP values and rest-IMP values, respectively, by the least-squares method. We assessed the relationships between rest-IMP values and pulsy-ASL values, ACZ-IMP values and standard-ASL values, and IMP-CVR and ASL-CVR. RESULTS: Significant relationships were observed between rest-IMP values and pulsy-ASL values (correlation coefficient (r=0.557, p<0.01)), ACZ-IMP values and standard-ASL values (r=0.825, p<0.01), and IMP-CVR and ASL-CVR (r=0.736, p<0.01). CONCLUSIONS: ASL-MRI is equivalent to SPECT and that it might serve as a noninvasive method for mapping CVR in MMD.
PURPOSE: To project a noninvasive method for mapping cerebrovascular reserve (CVR) in moyamoya disease (MMD) using ASL-MRI. METHODS: 16 MMD patients underwent cerebral blood flow (CBF) examinations by standard ASL-MRI, pulse-wave-synchronized ASL-MRI (pulsy ASL-MRI) which tagged the arterial blood coincident with a peak of a pulse wave, and single photon emission computed tomography (SPECT) imagings with iodine-123-N-isopropyl-p-iodoamphetamine in the resting (rest-IMP) and after acetazolamide challenge (ACZ-IMP). Hemispheric 32-sided cerebral blood flow (CBF) values were measured with normalized CBF maps created from standard ASL-MRI (standard-ASL value), pulsy ASL-MRI (pulsy-ASL value), rest-IMP (rest-IMP value), and ACZ-IMP (ACZ-IMP value). CVR based on rest-IMP and ACZ-IMP values (IMP-CVR) was calculated. ASL-CVR was also calculated on the basis of corrected standard-ASL values and pulsy-ASL values, which were adjusted to the ACZ-IMP values and rest-IMP values, respectively, by the least-squares method. We assessed the relationships between rest-IMP values and pulsy-ASL values, ACZ-IMP values and standard-ASL values, and IMP-CVR and ASL-CVR. RESULTS: Significant relationships were observed between rest-IMP values and pulsy-ASL values (correlation coefficient (r=0.557, p<0.01)), ACZ-IMP values and standard-ASL values (r=0.825, p<0.01), and IMP-CVR and ASL-CVR (r=0.736, p<0.01). CONCLUSIONS: ASL-MRI is equivalent to SPECT and that it might serve as a noninvasive method for mapping CVR in MMD.
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