Some types of volume in oncology

The volume of patient interested in the oncology is the region that we considered in the therapy. There are some types of volume in oncology.

1. PTV. PTV - Planning Tumor Volume (GTV <= CTV <= PTV). That is the region of tumor that we make a plan of therapy.
2. CTV. CTV - Clinical Tumor Volume (GTV <= CTV <= PTV). That is the region of tumor that is detected in clinic.
3. GTV. GTV - Gross Tumor Volume (GTV <= CTV <= PTV). That is the real (approximating) region of tumor of the patient.
4. Treated Volume. That is the region that we isolate for treatment.
5. Irradiated Volume. That is the region that we are irradiated. In this region, we need an enough dose to destroy the tumor.
6. Organ. That is the region representing organs of patient. This region is so sensible with the radiation. We need an minimal dose of radiation on this region.

Normalement, each computer-aided therapy software  supports all these volumns. Because, they are basic volumes considered in the oncology.