Fig. 1.

(A-C) Diaphragmatic rhabdomyosarcoma tumor burden at time of diagnosis. (D and E) Gross target volume (yellow contour), clinical target volume (green contour), and planning target volume (red contour). (F) 1-, 2-, and 3-Gy isodose lines from the delivered treatment plan indicate curvature of low-dose isodose lines away from the body under the influence of the magnetic field, without dose return to the skin, to show lack of clinically significant electron return effect or magnetic field–induced dose distortions. Abbreviations: CTV = clinical target volume; GTV = gross tumor volume; PTV = planning target volume.