By Gunilla C. Bentel
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Extra resources for Treatment Planning and Dose Calculation in Radiation Oncology
Radiopaque markers built into the col limator of such units represent the central axis as well as the field margins. Both are easily visible during fluoroscopy and on the radiographic image (Fig. 16). One can navigate the target volume into the field represented by these radiopaque collimator markers during fluoroscopy via remotely controlled three dimensional motion of the couch. The size of the collimator opening can then be adjusted to include the entire target volume in its largest dimension.
When it is cool, it retains this shape and functions as a repositioning and immobilizing device (Fig. 7). O. J. TREATMENT PLANNING IN RADIATION ONCOLOGY 49 The plastic material can be purchased either as a solid sheet or in perforated form. The cast, made for each patient, is placed on the patient for each treat ment and is attached to the treatment couch to provide restraint. Fig. 7. Aquaplast draped over the patient offers both restraint and position ing aid. It is sometimes necessary to restrain children or senile patients while the treatment is delivered.
When possible, it is desirable to place magnification devices at the same distance in the beam as most of the organs which need to be outlined on the contour. This would require only a cal culation of one magnification factor and then the size of the images of these TREATMENT PLANNING IN RADIATION ONCOLOGY 43 organs would be reduced by the same factor. In instances when the magnification device must be placed at another distance in the beam, the calculation of the magnification of various organs at different distances becomes necessary.
Treatment Planning and Dose Calculation in Radiation Oncology by Gunilla C. Bentel