Distortion‐free 3D diffusion imaging of the prostate using a multishot diffusion‐prepared phase‐cycled acquisition and dictionary matching

成像体模 等中心 有效扩散系数 人工智能 磁共振弥散成像 核医学 计算机科学 磁共振成像 数学 核磁共振 计算机视觉 物理 医学 放射科
作者
Elisa Roccia,Radhouène Neji,Thomas Benkert,Berthold Kiefer,Vicky Goh,Isabel Dregely
出处
期刊:Magnetic Resonance in Medicine [Wiley]
卷期号:85 (3): 1441-1454 被引量:2
标识
DOI:10.1002/mrm.28527
摘要

Purpose To achieve three‐dimensional (3D) distortion‐free apparent diffusion coefficient (ADC) maps for prostate imaging using a multishot diffusion prepared‐gradient echo (msDP‐GRE) sequence and ADC dictionary matching. Methods The msDP‐GRE sequence is combined with a 3D Cartesian, centric k‐space trajectory with center oversampling. Oversampled k‐space center averaging and phase cycling are used to address motion‐ and eddy current–induced magnitude corruption. Extended‐phase‐graph (EPG) simulations and ADC dictionary matching are used to compensate for T 1 effects. To shorten the acquisition time, each volume is undersampled by a factor of two and reconstructed using iterative sensitivity encoding. The proposed approach is characterized using simulations and validated in a kiwifruit phantom, comparing the msDP‐GRE ADC maps obtained using both standard monoexponential fitting and dictionary matching with the clinical standard single‐shot diffusion weighted‐echo planar imaging (ssDW‐EPI) ADC. Initial in vivo feasibility is tested in three healthy subjects, and geometric distortion is compared with anatomical T 2 ‐weighted‐turbo spin echo. Results In the kiwifruit phantom experiment, the signal magnitude could be recovered using k‐space center averaging and phase cycling. No statistically significant difference was observed in the ADC values estimated using msDP‐GRE with dictionary matching and clinical standard DW‐EPI ( P < .05). The in vivo prostate msDP‐GRE scans were free of geometric distortion caused by off‐resonance susceptibility, and the ADC values in the prostate were in agreement with values found in the published literature. Conclusion Nondistorted 3D ADC maps of the prostate can be achieved using a msDP sequence and dictionary matching.

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