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Accelerated Segmented Diffusion-Weighted Prostate Imaging for Higher Resolution, Higher Geometric Fidelity, and Multi-b Perfusion Estimation

Artikel i vetenskaplig tidskrift
Författare P. Aksit Ciris
J. Y. G. Chiou
D. I. Glazer
T. C. Chao
C. M. Tempany-Afdhal
B. Madore
Stephan E Maier
Publicerad i Investigative Radiology
Volym 54
Nummer/häfte 4
Sidor 238-246
ISSN 0020-9996
Publiceringsår 2019
Publicerad vid Institutionen för kliniska vetenskaper
Sidor 238-246
Språk en
Länkar dx.doi.org/10.1097/RLI.000000000000...
Ämnesord acceleration, diffusion MRI, echo-planar imaging, perfusion imaging, prostate cancer
Ämneskategorier Klinisk medicin

Sammanfattning

Purpose The aim of this study was to improve the geometric fidelity and spatial resolution of multi-b diffusion-weighted magnetic resonance imaging of the prostate. Materials and Methods An accelerated segmented diffusion imaging sequence was developed and evaluated in 25 patients undergoing multiparametric magnetic resonance imaging examinations of the prostate. A reduced field of view was acquired using an endorectal coil. The number of sampled diffusion weightings, or b-factors, was increased to allow estimation of tissue perfusion based on the intravoxel incoherent motion (IVIM) model. Apparent diffusion coefficients measured with the proposed segmented method were compared with those obtained with conventional single-shot echo-planar imaging (EPI). Results Compared with single-shot EPI, the segmented method resulted in faster acquisition with 2-fold improvement in spatial resolution and a greater than 3-fold improvement in geometric fidelity. Apparent diffusion coefficient values measured with the novel sequence demonstrated excellent agreement with those obtained from the conventional scan (R 2 = 0.91 for b max = 500 s/mm 2 and R 2 = 0.89 for b max = 1400 s/mm 2 ). The IVIM perfusion fraction was 4.0% ± 2.7% for normal peripheral zone, 6.6% ± 3.6% for normal transition zone, and 4.4% ± 2.9% for suspected tumor lesions. Conclusions The proposed accelerated segmented prostate diffusion imaging sequence achieved improvements in both spatial resolution and geometric fidelity, along with concurrent quantification of IVIM perfusion. © 2019 Wolters Kluwer Health, Inc. All rights reserved.

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