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- Title
Effect of Number of Acquisitions in Diffusion Tensor Imaging of the Pediatric Brain: Optimizing Scan Time and Diagnostic Experience.
- Authors
Soman, Salil; Holdsworth, Samantha J.; Skare, Stefan; Andre, Jalal B.; Van, Anh T.; Aksoy, Murat; Bammer, Roland; Rosenberg, Jarrett; Barnes, Patrick D.; Yeom, Kristen W.
- Abstract
ABSTRACT BACKGROUND AND PURPOSE Diffusion tensor imaging (DTI) is useful for multiple clinical applications, but its routine implementation for children may be difficult due to long scan times. This study evaluates the impact of decreasing the number of DTI acquisitions (NEX) on interpretability of pediatric brain DTI. METHODS 15 children with MRI-visible neuropathologies were imaged at 3T using our motion-corrected, parallel imaging- accelerated DT-EPI technique with 3 NEX (scan time 8.25 min). Using these acquisitions, NEX = 1 (scan time 2.75 min) and NEX = 2 (scan time 5.5 min) images were simulated. Two neuroradiologists scored diffusion-weighted images (DWI), apparent diffusion coefficient (ADC), fractional anisotropy (FA), and first eigenvector color-encoded (EV) images from each NEX for perceived SNR, lesion conspicuity and clinical confidence. ROI FA/ADC and image SNR values were also compared across NEX. RESULTS NEX = 2 perceived SNR, lesion conspicuity, and clinical confidence were not inferior to NEX = 3 images. NEX = 1 images showed comparable lesion conspicuity and clinical confidence as NEX = 3, but inferior perceived SNR. FA and ADC ROI measurements demonstrated no significant difference across NEX. The greatest SNR increase was seen between NEX = 1 and NEX = 2. CONCLUSION Reducing NEX to shorten imaging time may impact clinical utility in a manner that does not directly correspond with SNR changes.
- Subjects
DIFFUSION tensor imaging; NEUROLOGICAL disorders; ANISOTROPY; TISSUE wounds; JUVENILE diseases
- Publication
Journal of Neuroimaging, 2015, Vol 25, Issue 2, p296
- ISSN
1051-2284
- Publication type
Article
- DOI
10.1111/jon.12093