Spin echo based cardiac diffusion imaging at 7T: An ex vivo study of the porcine heart at 7T and 3T
| Autor: | Lohr, David, Terekhov, Maxim, Weng, Andreas Max, Schroeder, Anja, Walles, Heike, Schreiber, Laura Maria |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2018 |
| Předmět: |
Male
Swine Sus scrofa Signal-To-Noise Ratio Diagnostic Radiology Medicine and Health Sciences Herz Mammals Brain Mapping Echo-Planar Imaging Radiology and Imaging Models Cardiovascular Eukaryota Heart Diffusionstensor-Bildgebung Magnetic Resonance Imaging Diffusion Tensor Imaging Data Acquisition Models Animal Physical Sciences Vertebrates Medicine Anatomy Tractography Research Article Computer and Information Sciences Imaging Techniques Cardiac Ventricles Science Brain Morphometry Neuroimaging In Vitro Techniques Research and Analysis Methods Imaging Three-Dimensional Diagnostic Medicine Animals ddc:610 Magnetresonanztomographie Organisms Biology and Life Sciences Algebra Linear Algebra Amniotes Cardiovascular Anatomy Feasibility Studies Eigenvectors Mathematics Neuroscience |
| Zdroj: | PLoS ONE PLoS ONE, Vol 14, Iss 3, p e0213994 (2019) |
| ISSN: | 1932-6203 |
| Popis: | Purpose of this work was to assess feasibility of cardiac diffusion tensor imaging (cDTI) at 7 T in a set of healthy, unfixed, porcine hearts using various parallel imaging acceleration factors and to compare SNR and derived cDTI metrics to a reference measured at 3 T. Magnetic resonance imaging was performed on 7T and 3T whole body systems using a spin echo diffusion encoding sequence with echo planar imaging readout. Five reference (b = 0 s/mm\(^2\)) images and 30 diffusion directions (b = 700 s/mm\(^2\)) were acquired at both 7 T and 3 T using a GRAPPA acceleration factor R = 1. Scans at 7 T were repeated using R = 2, R = 3, and R = 4. SNR evaluation was based on 30 reference (b = 0 s/mm\(^2\)) images of 30 slices of the left ventricle and cardiac DTI metrics were compared within AHA segmentation. The number of hearts scanned at 7 T and 3 T was n = 11. No statistically significant differences were found for evaluated helix angle, secondary eigenvector angle, fractional anisotropy and apparent diffusion coefficient at the different field strengths, given sufficiently high SNR and geometrically undistorted images. R≥3 was needed to reduce susceptibility induced geometric distortions to an acceptable amount. On average SNR in myocardium of the left ventricle was increased from 29±3 to 44±6 in the reference image (b = 0 s/mm\(^2\)) when switching from 3 T to 7 T. Our study demonstrates that high resolution, ex vivo cDTI is feasible at 7 T using commercial hardware. |
| Databáze: | OpenAIRE |
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