A Systematic Review of the Clinical Implementation of Pelvic Magnetic Resonance Imaging (MR)-Only Planning for External Beam Radiation Therapy
Abstract
The use of magnetic resonance imaging (MRI) scans alone for radiotherapy treatment planning (MR-only planning) has been highlighted as one method of improving patient outcomes. Recent technological advances have meant that introducing MR-only planning to the clinic is now becoming a reality, with several specialist radiotherapy clinics treating patients with this technique. As such, substantial efforts are being made to introduce this technique into wide-spread clinical implementation. A systematic review of publications investigating the clinical implementation of pelvic MR-only radiotherapy treatment planning was undertaken following the PRISMA guidelines. The Medline, Embase, Scopus, Science Direct, CINAHL and Web of Science databases were searched (timespan: all years to 2nd January 2019). Twenty six articles met the inclusion criteria. The studies were grouped into the following categories: 1. MR acquisition and synthetic-CT generation verification, 2. MR distortion quantification and phantom development, 3. Clinical validation of patient treatment positioning in an MR-only workflow and 4. MR-only commissioning processes. Key conclusions from this review are: i) MR-only planning has been clinically implemented for prostate cancer treatments; ii) A substantial amount of work remains to translate MR-only planning into wide spread clinical implementation for all pelvic sites; iii) MR scanner distortions are no longer a barrier to MR-only planning; however they must be…
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