By Ben J. Slotman, Timothy D. Solberg, Dirk Verellen
For radiation oncologists and physicists who wish an authoritative evaluate of rising advancements within the box, in addition to transparent path at the usage of this new know-how in scientific perform, this reference offers in-depth descriptions of latest and promising stereotactic equipment for the applying of stereotactic radiotherapy for the therapy of extracranial tumors.
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Extra resources for Extracranial Stereotactic Radiotherapy and Radiosurgery
From that point on the entire positioning procedure is computer driven and performed from outside the treatment room. (b) A preliminary isocenter position is deﬁned by the user that does not require a predeﬁned IR-reﬂective marker conﬁguration on the patient’s skin and can even consist of IR-reﬂective markers rigidly ﬁxed to the treatment couch. The latter has the advantage that breathing movements are eliminated and is therefore more stable. The disadvantage is that the system is no longer able to track patient movements during the positioning process and assumes that the patient is perfectly motionless.
B) A preliminary isocenter position is deﬁned by the user that does not require a predeﬁned IR-reﬂective marker conﬁguration on the patient’s skin and can even consist of IR-reﬂective markers rigidly ﬁxed to the treatment couch. The latter has the advantage that breathing movements are eliminated and is therefore more stable. The disadvantage is that the system is no longer able to track patient movements during the positioning process and assumes that the patient is perfectly motionless. This option requires the entire positioning procedure to start from an a priori assumed correct treatment position (which will be corrected afterwards), after which the remaining procedure 26 Figure 4 (Caption on facing page) Medin and Verellen Novalis Õ 27 is again remote controlled and computer assisted.
Automated fusion of X-ray images and DRRs. In this setup, a 2D/3D co-registration algorithm is applied to align a 3D CT patient data set with two X-ray images. , the exact position of the X-ray tubes and detectors are known with respect to the machine’s isocenter), it is possible to generate digitally reconstructed radiographs (DRRs) from the planning CT (representing the ideal patient position) and compare these with the acquired X-ray images. For accurate positioning both the location and orientation of the patient need to be assessed, taking into account all six degrees-of-freedom (6 DOF) for the image co-registration (translations as well as rotations).