ArticleRadiation oncology (London, England)2018
Per-organ assessment of subject-induced susceptibility distortion for MR-only male pelvis treatment planning.
Article in Radiation oncology (London, England), 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Validation of daily 0.35 T diffusion-weighted MRI for MRI-guided glioblastoma radiotherapy.Medical physics · 2024Article
- Impact of technological advances in treatment planning, image guidance, and treatment delivery on target margin design for prostate cancer radiotherapy: an updated review.The British journal of radiology · 2024Review
- Characterizing geometric distortions of 3D sequences in clinical head MRI.Magma (New York, N.Y.) · 2022Article
- Task group 284 report: magnetic resonance imaging simulation in radiotherapy: considerations for clinical implementation, optimization, and quality assurance.Medical physics · 2021Article
- Rapid multicontrast brain imaging on a 0.35T MR-linac.Medical physics · 2020Article
- Tumor-site specific geometric distortions in high field integrated magnetic resonance linear accelerator radiotherapy.Physics and imaging in radiation oncology · 2020Article
- A novel and rapid approach to estimate patient-specific distortions based on mDIXON MRI.Physics in medicine and biology · 2019Article
- Geometric and dosimetric impact of anatomical changes for MR-only radiation therapy for the prostate.Journal of applied clinical medical physics · 2019Article
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Authors and funding
6 authors.
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Abstract
backgroundPatient-specific distortions, particularly near tissue/air interfaces, require assessment for magnetic resonance (MR) only radiation treatment planning (RTP). However, patients are dynamic due to changes in physiological status during imaging sessions. This work investigated changes in subject-induced susceptibility distortions to pelvic organs at different bladder states to support pelvis MR-only RTP.
methodsPelvises of 9 healthy male volunteers were imaged at 1.0 Tesla (T), 1.5 T, and 3.0 T. Subject-induced susceptibility distortion field maps were generated using a dual-echo gradient-recalled echo (GRE) sequence with B
resultsThe time between the initial and final B0 maps was 42.6 ± 13.9 (range: 13.2-62.1) minutes with minimal change in magnet central frequency (0.02 ± 0.05 mm (range: - 0.06 - 0.12 mm)). Subject-induced susceptibility distortion across all bladder states, field strengths, and subjects was relatively small (1.4-1.9% of all voxels in the prostate and seminal vesicles were distorted > 0.5 mm). In the bladder, no voxels exhibited distortions > 1 mm. An extreme case acquired at 3.0 T with a large volume of rectal air yielded 27.4-34.6% of voxels within the CTVs had susceptibility-induced distortions > 0.5 mm across all time points.
conclusionsOur work suggests that subject-induced susceptibility distortions caused by bladder/rectal conditions are generally small and subject-dependent. Local changes may be non-negligible within the CTV, thus proper management of filling status is warranted. Future work evaluating the impact of multiple models to accommodate for extreme status changes may be advantageous.
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