AI Article Synopsis
- The study explores the use of parallel imaging compressed sensing (PICS) in MRI to decrease scan time and enhance signal-to-noise ratio (SNR) during prostate brachytherapy dosimetry.
- Ten patients undergoing treatment were scanned using advanced MRI techniques, and images were reconstructed with varying acceleration factors to assess image quality.
- Results showed that PICS allowed for sufficient image quality at acceleration factors up to 4, maintaining SNR and anatomical detail, suggesting it can reduce scan time while improving dosimetry efficiency without requiring additional equipment like an endorectal coil.
Article Abstract
Purpose: To investigate the feasibility of using parallel imaging compressed sensing (PICS) to reduce scan time and improve signal-to-noise ratio (SNR) in MRI-based postimplant dosimetry of prostate brachytherapy.
Methods And Materials: Ten patients underwent low-dose-rate prostate brachytherapy with radioactive seeds stranded with positive magnetic resonance-signal seed markers and were scanned on a Siemens 1.5T Aera. MRI comprised a fully balanced steady-state free precession sequence with two 18-channel external pelvic array coils with and without a rigid two-channel endorectal coil. The fully sampled data sets were retrospectively subsampled with increasing acceleration factors and reconstructed with parallel imaging and compressed sensing algorithms. The images were assessed in a blinded reader study by board-certified care providers. Rating scores were compared for statistically significant differences between reconstruction types.
Results: Images reconstructed from subsampling up to an acceleration factor of 4 with PICS demonstrated consistently sufficient quality for dosimetry with no apparent loss of SNR, anatomy depiction, or seed/marker conspicuity when compared to the fully sampled images. Images obtained with acceleration factors of 5 or 6 revealed reduced spatial resolution and seed marker contrast. Nevertheless, the reader study revealed that images obtained with an acceleration factor of up to 5 and reconstructed with PICS were adequate-to-good for postimplant dosimetry.
Conclusions: Combined parallel imaging and compressed sensing can substantially reduce scan time in fully balanced steady-state free precession imaging of the prostate while maintaining adequate-to-good image quality for postimplant dosimetry. The saved scan time can be used for multiple signal averages and improved SNR, potentially obviating the need for an endorectal coil in MRI-based postimplant dosimetry.
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| http://dx.doi.org/10.1016/j.brachy.2018.05.003 | DOI Listing |
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