Accelerated Segmented Diffusion-Weighted Prostate Imaging for Higher Resolution, Higher Geometric Fidelity, and Multi-b Perfusion Estimation
Autor: | Clare M. Tempany-Afdhal, Stephan E. Maier, Pelin Aksit Ciris, Bruno Madore, Tzu Cheng Chao, Daniel I. Glazer, Jr Yuan George Chiou |
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Rok vydání: | 2019 |
Předmět: |
Male
Article 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Image Interpretation Computer-Assisted medicine Humans Effective diffusion coefficient Radiology Nuclear Medicine and imaging Diffusion (business) Image resolution Multiparametric Magnetic Resonance Imaging Intravoxel incoherent motion Aged medicine.diagnostic_test Resolution (electron density) Prostate Prostatic Neoplasms Reproducibility of Results Magnetic resonance imaging General Medicine Perfusion Diffusion Magnetic Resonance Imaging 030217 neurology & neurosurgery Biomedical engineering |
Zdroj: | Investigative Radiology. 54:238-246 |
ISSN: | 0020-9996 |
DOI: | 10.1097/rli.0000000000000536 |
Popis: | 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. |
Databáze: | OpenAIRE |
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