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Accelerated 3D T 2 w‐imaging of the prostate with 1‐millimeter isotropic resolution in less than 3 minutes
Author(s) -
Vidya Shankar Rohini,
Roccia Elisa,
Cruz Gastao,
Neji Radhouene,
Botnar René,
Prezzi Davide,
Goh Vicky,
Prieto Claudia,
Dregely Isabel
Publication year - 2019
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.27764
Subject(s) - image quality , prostate , computer science , nuclear medicine , medicine , contrast (vision) , artificial intelligence , medical physics , image (mathematics) , cancer
Purpose To achieve 3D T 2 w imaging of the prostate with 1‐mm isotropic resolution in less than 3 min. Methods We devised and implemented a 3D T 2 ‐prepared multishot balanced steady state free precession (T 2 prep‐bSSFP) acquisition sequence with a variable density undersampled trajectory combined with a total variation regularized iterative SENSE (TV‐SENSE) reconstruction. Prospectively undersampled images of the prostate (acceleration factor R = 3) were acquired in 11 healthy subjects in an institutional review board‐approved study. Image quality metrics (subjective signal‐to‐noise ratio, contrast, sharpness, and overall prostate image quality) were evaluated by 2 radiologists. Scores of the proposed accelerated sequence were compared using the Wilcoxon signed‐rank and Kruskal‐Wallis non‐parametric tests to prostate images acquired using a fully sampled 3D T 2 prep‐bSSFP acquisition, and with clinical standard 2D and 3D turbo spin echo (TSE) T 2 w acquisitions. A P ‐value < 0.05 was considered significant. Results The 3× accelerated 3D T 2 prep‐bSSFP images required a scan time (min:s) of 2:45, while the fully sampled 3D T 2 prep‐bSSFP and clinical standard 3D TSE images were acquired in 8:23 and 7:29, respectively. Image quality scores (contrast, sharpness, and overall prostate image quality) of the accelerated 3D T 2 prep‐bSSFP, fully sampled T 2 prep‐bSSFP, and clinical standard 3D TSE acquisitions along all 3 spatial dimensions were not significantly different ( P > 0.05). Conclusion 3D T 2 w images of the prostate with 1‐mm isotropic resolution can be acquired in less than 3 min, with image quality that is comparable to a clinical standard 3D TSE sequence but only takes a third of the acquisition time.