*GenesisCare, Greenbelt

§National Cancer Institute, Bethesda, MD

†The Warren Alpert Medical School of Brown University, Providence, RI

‡University of California, Los Angeles (UCLA), Los Angeles

∥Stanford University, Stanford, CA

¶Washington University School of Medicine, Saint Louis, MO

#Advanced Molecular Imaging and Therapy, Glen Burnie, MD

**University of Wisconsin School of Medicine and Public Health, Madison, WI

††Department of Radiology, Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania

∥∥University of Pennsylvania, Philadelphia

§§WellSpan Health, Chambersburg, PA

‡‡TriHealth Cancer and Blood Institute, Cincinnati, OH

¶¶Mount Sinai Health System, Mount Sinai, NY

##Duke University, Durham, NC

***Department of Radiation Oncology, Stritch School of Medicine, Cardinal Bernardin Cancer Center, Loyola University Chicago, Chicago, IL

†††Department of Radiation Oncology, Maguire Center, Maywood, IL

‡‡‡Rakuten-Medical, South Florida Proton Therapy Institute, FL

*This practice parameter has been posted on the American College of Radiology website (acr.org) as of October 2023.

P.E.W. and D.C.Y. contributed equally to the article’s content as well as supervision of the iterative reviews by the collaborating organizations and reconciliation process for all members’ suggestions, comments, and edits.

Correspondence: Paul E. Wallner, DO, GenesisCare 7503 Greenway Center Dr, Greenbelt, MD 20770 ([email protected]); Don C. Yoo, MD, The Warren Alpert Medical School of Brown University 222 Richmond St, Providence, RI 02903 ([email protected]).