Shaozhen Yan1,2, Zhigang Qi1,2, Yanhong An1,2, Mo Zhang1,2, Tianyi Qian3, Jie Lu1,2,4. 1. Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, P.R. China. 2. Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, P.R. China. 3. MR Collaborations NE Asia, Siemens Healthcare, Beijing, P.R. China. 4. Department of Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing, P.R. China.
Abstract
BACKGROUND: Vascular factors contributing to cerebral hypoperfusion are implicated in the risk of developing Alzheimer's disease (AD). PURPOSE: To investigate the time-shift mapping created time-shift value of the brain by resting-state functional magnetic resonance imaging (rs-fMRI), and to determine the differences in time-shift value among AD, mild cognitive impairment (MCI), and normal control (NC) groups to better understand the disease. STUDY TYPE: Prospective. SUBJECTS: Twenty-four AD, 24 MCI, and 24 age-matched NC participants. FIELD STRENGTH/SEQUENCE: T2 *-weighted single-shot echo-planar imaging sequence was performed at 3T. In addition, a T1 -weighted fast spoiled gradient-echo sequence was acquired for coregistration. ASSESSMENT: The brain time-shift value was determined from rs-fMRI-based blood oxygenation level-dependent (BOLD) signal in the three groups by time-shift mapping. The perfusion patterns were also investigated in the NC group. STATISTICAL TESTS: One-way analysis of variance and chi-squared tests were used to compare demographic information. The normalized time-shift maps were analyzed in a second-level test using SPM8. All analyses were evaluated with a significance level of P < 0.05 after false discovery rate (FDR) correction. RESULTS: The time-shift maps obtained from rs-fMRI are consistent with the cerebral blood supply atlas. Compared with NC, both MCI and AD groups had less early perfusion arrival areas among the whole brain. In the delayed time-shift value for the AD group, the areas were located in the bilateral precuneus, the sensory-motor cortex in the left hemisphere, and the bilateral calcarine sulcus, which were different from the MCI group (both P < 0.05, FDR corrected). DATA CONCLUSION: The time-shift mapping method could detect perfusion deficits in AD and MCI noninvasively. The perfusion deficits detected by rs-fMRI may provide new insight for understanding the mechanism of neurodegeneration. Level of Evidence 2 Technical Efficacy Stage 3 J. Magn. Reson. Imaging 2019;49:1099-1104.
BACKGROUND: Vascular factors contributing to cerebral hypoperfusion are implicated in the risk of developing Alzheimer's disease (AD). PURPOSE: To investigate the time-shift mapping created time-shift value of the brain by resting-state functional magnetic resonance imaging (rs-fMRI), and to determine the differences in time-shift value among AD, mild cognitive impairment (MCI), and normal control (NC) groups to better understand the disease. STUDY TYPE: Prospective. SUBJECTS: Twenty-four AD, 24 MCI, and 24 age-matched NC participants. FIELD STRENGTH/SEQUENCE: T2 *-weighted single-shot echo-planar imaging sequence was performed at 3T. In addition, a T1 -weighted fast spoiled gradient-echo sequence was acquired for coregistration. ASSESSMENT: The brain time-shift value was determined from rs-fMRI-based blood oxygenation level-dependent (BOLD) signal in the three groups by time-shift mapping. The perfusion patterns were also investigated in the NC group. STATISTICAL TESTS: One-way analysis of variance and chi-squared tests were used to compare demographic information. The normalized time-shift maps were analyzed in a second-level test using SPM8. All analyses were evaluated with a significance level of P < 0.05 after false discovery rate (FDR) correction. RESULTS: The time-shift maps obtained from rs-fMRI are consistent with the cerebral blood supply atlas. Compared with NC, both MCI and AD groups had less early perfusion arrival areas among the whole brain. In the delayed time-shift value for the AD group, the areas were located in the bilateral precuneus, the sensory-motor cortex in the left hemisphere, and the bilateral calcarine sulcus, which were different from the MCI group (both P < 0.05, FDR corrected). DATA CONCLUSION: The time-shift mapping method could detect perfusion deficits in AD and MCI noninvasively. The perfusion deficits detected by rs-fMRI may provide new insight for understanding the mechanism of neurodegeneration. Level of Evidence 2 Technical Efficacy Stage 3 J. Magn. Reson. Imaging 2019;49:1099-1104.
Authors: Ganesh B Chand; Mohamad Habes; Sudipto Dolui; John A Detre; David A Wolk; Christos Davatzikos Journal: J Neurosci Methods Date: 2019-11-19 Impact factor: 2.390
Authors: Ayse Ceren Tanrıtanır; Kersten Villringer; Ivana Galinovic; Ulrike Grittner; Evgeniya Kirilina; Jochen B Fiebach; Arno Villringer; Ahmed A Khalil Journal: Front Neurol Date: 2020-05-05 Impact factor: 4.003