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Fig. 2 | Radiation Oncology

Fig. 2

From: Feasibility study of volumetric modulated arc therapy with Halcyon™ linac for total body irradiation

Fig. 2

Splitting the planning CT images into a cranial and a caudal part necessitates a dosimetric alignment of these two body parts. The cranial part is created using the head-first position from the vertex to upper thigh, and the caudal part is created using the feet-first position from the toes to lower thigh because the PTV length exceeds the couch travel capability of the Halcyon™ linac. The overall PTV is split into seven segments with a subsequent multi-isocentric planning. There are thirteen isocenters. Each segment is divided at 13 cm from the center in the caudal-cranial direction because of capacity of collimators

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