Conventional CT scans are used to work out the shape of the place where a dose of radiation needs to be concentrated in order to attack a tumour without damaging nearby healthy tissue.

• 传统的CT扫描仅仅是对肿瘤进行定位成像，随后在不损伤周边正常组织的情况下通过对该部位进行定量的放射以杀灭肿瘤细胞。