Target Volume Definition in Radiation Oncology by Anca-Ligia Grosu & Carsten Nieder

Author:Anca-Ligia Grosu & Carsten Nieder
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

At this stage the isodose display of the treatment is available, and it is possible to validate the treatment plan. For this validation the DVH is a very useful tool. It is important to check the volume of each OAR, GTV and CTV, and to assess whether ominous discrepancies from expected sizes are observed. Also it is crucial to visualize the isodoses on the sagittal plane (and some transverse axial planes) to assess the satisfactory coverage of the GTV and protection of the main OAR. An ultimate optimization can be performed but will be essentially subjective. The most difficult point is usually at the anterior level of the PTV (or CTV) to find a balance between the desired dose in the GTV/CTV and avoid excessive dose in the OAR (bladder, small bowel, prostate, vagina etc.) and also in case of T4 tumor with invasion of neighboring organs to position properly the boost CTV/PTV.

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