ArticleMagma (New York, N.Y.)2021
Image distortion correction for MRI in low field permanent magnet systems with strong B
Article in Magma (New York, N.Y.), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
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- Zero-echo-time sequences in highly inhomogeneous fields.Magnetic resonance in medicine · 2025Article
- Spherical echo-planar time-resolved imaging (sEPTI) for rapid 3D quantitativeMagnetic resonance in medicine · 2025Article
- MRI at low field: A review of software solutions for improving SNR.NMR in biomedicine · 2025Review
- Addressing image misalignments in multi-parametric prostate MRI for enhanced computer-aided diagnosis of prostate cancer.Scientific reports · 2023Article
- Multi-parametric optimization of magnetic resonance imaging sequences for magnetic resonance-guided radiotherapy.Physics and imaging in radiation oncology · 2023Article
- Specific absorption rate (SAR) simulations for low-field (< 0.1 T) MRI systems.Magma (New York, N.Y.) · 2023Review
- 3D magnetic resonance fingerprinting on a low-field 50 mT point-of-care system prototype: evaluation of muscle and lipid relaxation time mapping and comparison with standard techniques.Magma (New York, N.Y.) · 2023Article
- Off-resonance artifact correction for MRI: A review.NMR in biomedicine · 2023Review
- Water/fat separation for self-navigated diffusion-weighted multishot echo-planar imaging.NMR in biomedicine · 2023Article
- Portable magnetic resonance imaging of patients indoors, outdoors and at home.Scientific reports · 2022Article
- In vivo TMagnetic resonance in medicine · 2022Article
- Spatial Frequency Domain Imaging System Calibration, Correction and Application for Pear Surface Damage Detection.Foods (Basel, Switzerland) · 2021Article
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Authors and funding
4 authors.
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Abstract
objectiveTo correct for image distortions produced by standard Fourier reconstruction techniques on low field permanent magnet MRI systems with strong [Formula: see text] inhomogeneity and gradient field nonlinearities. MATERIALS AND
methodsConventional image distortion correction algorithms require accurate [Formula: see text] maps which are not possible to acquire directly when the [Formula: see text] inhomogeneities also produce significant image distortions. Here we use a readout gradient time-shift in a TSE sequence to encode the [Formula: see text] field inhomogeneities in the k-space signals. Using a non-shifted and a shifted acquisition as input, [Formula: see text] maps and images were reconstructed in an iterative manner. In each iteration, [Formula: see text] maps were reconstructed from the phase difference using Tikhonov regularization, while images were reconstructed using either conjugate phase reconstruction (CPR) or model-based (MB) image reconstruction, taking the reconstructed field map into account. MB reconstructions were, furthermore, combined with compressed sensing (CS) to show the flexibility of this approach towards undersampling. These methods were compared to the standard fast Fourier transform (FFT) image reconstruction approach in simulations and measurements. Distortions due to gradient nonlinearities were corrected in CPR and MB using simulated gradient maps.
resultsSimulation results show that for moderate field inhomogeneities and gradient nonlinearities, [Formula: see text] maps and images reconstructed using iterative CPR result in comparable quality to that for iterative MB reconstructions. However, for stronger inhomogeneities, iterative MB reconstruction outperforms iterative CPR in terms of signal intensity correction. Combining MB with CS, similar image and [Formula: see text] map quality can be obtained without a scan time penalty. These findings were confirmed by experimental results. DISCUSSION: In case of [Formula: see text] inhomogeneities in the order of kHz, iterative MB reconstructions can help to improve both image quality and [Formula: see text] map estimation.
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