3D‐multi‐spectral T 2 mapping near metal implants
نویسندگان
چکیده
منابع مشابه
B 1 Effects when Imaging Near Metal Implants at 3 T
Introduction: The MAVRIC and SEMAC techniques enable low susceptibility-artifact imaging near metal implants using conventional spin-echo techniques [1,2]. Previous demonstrations of these techniques have been performed at 1.5T. Extending the techniques to 3T is easily feasible from a susceptibility artifact mitigation standpoint. This is due to the fact that both techniques restrict off-resona...
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Purpose: Multispectral imaging (MSI) approaches such as SEMAC, MAVRIC, MAVRIC-SL and others have shown promise for artifact-reduced imaging near metal [1-3]. These methods all combine multiple 3D images, each from a separately excited region (frequency bands in MAVRIC, distorted slices in SEMAC). The longer scan times of these approaches can be mitigated using reduced-excitation-region approach...
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indicates the location of metal implants. b) Auto-calibrated SENSE (RMSE = 1037). c) SENSE with single calibration (RMSE = 3364). The arrow indicates image artifacts. d) Autocalibrated ARC (RMSE=372). e) ARC recon using single calibration (RMSE = 383). f) ARC recon using two concatenated calibration data sets (RMSE = 364). Figure 3: a) Fast spin-echo image. b) Fully sampled MAVRIC image c)Under...
متن کاملA multispectral three-dimensional acquisition technique for imaging near metal implants.
Metallic implants used in bone and joint arthroplasty induce severe spatial perturbations to the B0 magnetic field used for high-field clinical magnetic resonance. These perturbations distort slice-selection and frequency encoding processes applied in conventional two-dimensional MRI techniques and hinder the diagnosis of complications from arthroplasty. Here, a method is presented whereby mult...
متن کاملGeneralized Reconstruction of Multi-Spectral MR Acquisitions for Imaging Near Metal Implants
Introduction MR imaging near metal implants is a challenging problem due to the presence of very large induced B B0B field dispersions (~ 20 kHz). Several techniques have been recently developed, that effectively divide the large spectral range into smaller bins, dramatically reducing B B0 B-related distortions [1,2,3]. The MAVRIC technique [1,2] acquires several 3D datasets using different tra...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2019
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.27744