期刊
NEUROIMAGE
卷 31, 期 2, 页码 627-640出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2005.12.013
关键词
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资金
- Medical Research Council [G116/143] Funding Source: Medline
- NCRR NIH HHS [RR019771, R21 RR019771] Funding Source: Medline
- NIA NIH HHS [U01 AG024904, U19 AG010483, R01 AG010897, P50 AG016570, AG016570] Funding Source: Medline
- NIBIB NIH HHS [EB01651] Funding Source: Medline
- NLM NIH HHS [R01 LM005639, LM05639] Funding Source: Medline
- MRC [G116/143] Funding Source: UKRI
- Medical Research Council [G116/143] Funding Source: researchfish
Measures of brain change can be computed from sequential MRI scans, providing valuable information on disease progression, e.g., for patient monitoring and drug trials. Tensor-based morphometry (TBM) creates maps of these brain changes, visualizing the 3D profile and rates of tissue growth or atrophy, but its sensitivity depends on the contrast and geometric stability of the images. As part of the Alzheimer's Disease Neuroimaging Initiative (ADNI), 17 normal elderly subjects were scanned twice (at a 2-week interval) with several 3D 1.5 T MRI pulse sequences: high and low flip angle SPGR/FLASH (from which Synthetic T1 images were generated), MP-RAGE, IR-SPGR (N = 10) and MEDIC (N = 7) scans. For each subject and scan type, a 3D deformation map aligned baseline and follow-up scans, computed with a nonlinear, inverse-consistent elastic registration algorithm. Voxelwise statistics, in ICBM stereotaxic space, visualized the profile of mean absolute change and its cross-subject variance; these maps were then compared using permutation testing. Image stability depended on: (1) the pulse sequence; (2) the transmit/receive coil type (birdcage versus phased array); (3) spatial distortion corrections (using MEDIC sequence information); (4) B1-ield intensity inhomogeneity correction (using N3). SPGR/FLASH images acquired using a birdcage coil had least overall deviation. N3 correction reduced coil type and pulse sequence differences and improved scan reproducibility, except for Synthetic T1 images (which were intrinsically corrected for B1-inhomogeneity). No strong evidence favored B0 correction. Although SPGR/FLASH images showed least deviation here, pulse sequence selection for the ADN1 project was based on multiple additional image analyses, to be reported elsewhere. (c) 2006 Elsevier Inc. All rights reserved.
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