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Fig. 2 | Radiation Oncology

Fig. 2

From: Single-isocenter multiple-target stereotactic radiosurgery for multiple brain metastases: dosimetric evaluation of two automated treatment planning systems

Fig. 2

Axial (first row) and sagittal (second row) dose distributions, shown in color wash (12 to 24 Gy), from Elements MBM DCAT (panel A and C) and HA VMAT (panel B and D) plans in a patient (case 36) with 25 brain metastases (only some of them are visible in the selected slices). Total tumor volume was 2.43 cm3. A 1-mm GTV-to-PTV margin was used with 20 Gy prescribed to all targets in single fraction. The 12 Gy isodose-shell around the targets with the typical enlargement in case of adjacent lesions, which may bring to dose bridging, is shown for both plans. The volume of normal brain receiving 12 Gy (V12Gy) was 45.9 cm3 for DCAT plan and 56.3 cm3 for VMAT plan. The different management of the dose bridging between the different techniques is noticeable

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