The treatment volume may be the diseased tissue only, but in cancer treatment it usually includes the cancer and tissues around it that may harbor microscopic extensions of cancer. The place on the body at which the radiation beam is aimed. The table that the patient lies on during treatment . In proton radiation therapy, final patient alignment is performed by adjusting the motorized table with respect to the proton nozzle so that the treatment position matches the position the patient was in when the planning CT scans were taken. An abnormal mass of tissue .
Tumors are either benign or malignant.