AI Article Synopsis
- PROPELLER is a technique used in MRI that reduces motion artifacts but extends scan times and is mainly limited to T2 contrast.
- The proposed multi-step joint-blade (MJB) SENSE reconstruction method enhances PROPELLER by reducing noise amplification and allowing for more flexible imaging contrasts.
- MJB SENSE consists of three steps: creating blade-combined images, using these images to reduce noise, and then joint reconstruction of all blades, leading to improved image quality and computational efficiency in both T1 and T2-weighted brain imaging.
Article Abstract
PROPELLER technique is widely used in MRI examinations for being motion insensitive, but it prolongs scan time and is restricted mainly to T2 contrast. Parallel imaging can accelerate PROPELLER and enable more flexible contrasts. Here, we propose a multi-step joint-blade (MJB) SENSE reconstruction to reduce the noise amplification in parallel imaging accelerated PROPELLER. MJB SENSE utilizes the fact that PROPELLER blades contain sharable information and blade-combined images can serve as regularization references. It consists of three steps. First, conventional blade-combined images are obtained using the conventional simple single-blade (SSB) SENSE, which reconstructs each blade separately. Second, the blade-combined images are employed as regularization for blade-wise noise reduction. Last, with virtual high-frequency data resampled from the previous step, all blades are jointly reconstructed to form the final images. Simulations were performed to evaluate the proposed MJB SENSE for noise reduction and motion correction. MJB SENSE was also applied to both T2-weighted and T1-weighted in vivo brain data. Compared to SSB SENSE, MJB SENSE greatly reduced the noise amplification at various acceleration factors, leading to increased image SNR in all simulation and in vivo experiments, including T1-weighted imaging with short echo trains. Furthermore, it preserved motion correction capability and was computationally efficient.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5311996 | PMC |
| http://dx.doi.org/10.1038/srep42602 | DOI Listing |
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