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MRI-guided Pelvic Radiation Therapy: A Primer for Radiologists. | LitMetric

MRI-guided Pelvic Radiation Therapy: A Primer for Radiologists.

Radiographics

From the Leeds Institute of Medical Research (J.Z., A.S., A.H.) and Department of Biomedical Imaging (D.B.), University of Leeds, 6 Clarendon Way, Woodhouse, Leeds LS2 9LH, England; Leeds Cancer Centre, St James's University Hospital, Leeds, England (J.Z., A.S., A.H.); Department of Radiation Oncology, Charité Universitätsmedizin Berlin, Berlin, Germany (M.K.); Radiation Therapy Research Group (M.K., P.M., A.D., C.E., M.D., P.H., A.C.) and Division of Cancer Sciences (D.M.), University of Manchester, Manchester, England; and The Christie NHS Foundation Trust, Manchester, England (P.M., C.E., M.D., D.M., P.H., A.C.).

Published: November 2023

AI Article Synopsis

Article Abstract

Radiation therapy (RT) is a core pillar of oncologic treatment, and half of all patients with cancer receive this therapy as a curative or palliative treatment. The recent integration of MRI into the RT workflow has led to the advent of MRI-guided RT (MRIgRT). Using MRI rather than CT has clear advantages for guiding RT to pelvic tumors, including superior soft-tissue contrast, improved organ motion visualization, and the potential to image tumor phenotypic characteristics to identify the most aggressive or treatment-resistant areas, which can be targeted with a more focal higher radiation dose. Radiologists should be familiar with the potential uses of MRI in planning pelvic RT; the various RT techniques used, such as brachytherapy and external beam RT; and the impact of MRIgRT on treatment paradigms. Current clinical experience with and the evidence base for MRIgRT in the settings of prostate, cervical, and bladder cancer are discussed, and examples of treated cases are illustrated. In addition, the benefits of MRIgRT, such as real-time online adaptation of RT (during treatment) and interfraction and/or intrafraction adaptation to organ motion, as well as how MRIgRT can decrease toxic effects and improve oncologic outcomes, are highlighted. MRIgRT is particularly beneficial for treating mobile pelvic structures, and real-time adaptive RT for tumors can be achieved by using advanced MRI-guided linear accelerator systems to spare organs at risk. Future opportunities for development of biologically driven adapted RT with use of functional MRI sequences and radiogenomic approaches also are outlined. RSNA, 2023 Quiz questions for this article are available in the supplemental material.

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Source
http://dx.doi.org/10.1148/rg.230052DOI Listing

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