INTRACAVITARY AND INTERSTITIAL TREATMENT APPLICATIONS IN EGE UNIVERSITY MEDICAL FACULTY DEPARTMENT OF RADIATION ONCOLOGY

Intracavitary and interstitial treatment applications with micro Selectron, HDR (Nucletron) device have been carried on in Ege University Medical Faculty Department of Radiation Oncology since October 1992. Between October 1992 and August 1993 eighty-eight intracavitary applications were applied to 70 patients with gynaecological malignancies. Fifty two of them were operated and 18 were inoperable. Operated patients had received a single fraction of 9.25 Gy, 5-7 mm beneath the vaginal surface while inoperable patients had received two fractions of 8.5 Gy, to the a point with one week interval. Treatment planning and dosimetric calculations were done with Nucletron Plato compuler planning system. At the end of 7 applications simulation films were taken again under the same conditions to investigate the differences in some patients and applicator points. The bladder, rectum, vagina points shiffed 4.49 mm, 4.83 mm, 1.35 mm respectively. These shifts were attributed to involuntary rectal movements and the increase in bladder fullness. Mean change in appilacator points was 0.89 mm. it was concluded that the immobilization in applications were excellent. In operated patients bladder and rectum doses were 6.24 Gy and 4,47 Gy, and in inoperable patients 8.55 Gy ad 5.24 Gy respectively. They were in tolerable levels. Especially in operated patients the high dose levels in, bladder chain point revealed out that Foley catheter balloon point alone does not reflect the bladder dose truly.