STEREOTACTIC THERAPY SYSTEM

摘要

A fiducial marker system (210a-c, 10) comprises a first unit (8) and a second unit (9). The first unit is patient affixable and comprises a partly spherical inner surface (805) having a first center point (1230) that is adapted to receive a touch probe measurement head (420) for measuring the spatial position of the center point. The second unit is releasably attachable to an outer surface (808) of the first unit, and has a second center point (910), wherein the first center point and the second center point are substantially identical when the second unit is attached to the first unit. For stereotactic therapy, a patient is imaged with the first and second unit assembled. Then the second unit is detached. A stereotactic frame (300) is attached to the first units via arms (1310a-1310d). Thus frameless imaging is provided in a frame based stereotactic surgery system with high precision. Repeated assembly of the frame (300) to the first units, remaining in the patient, provides advantageous fractionized stereotactic radiotherapy.