THE MEASUREMENT OF DOSE TO THE LENS FROM PROPHYLACTIC CRANIAL [IRRADIATION IN ACUTE LYMPHOBLASTIC LEUKEMIA
Abstract
This study was performed to measure the radiation dose to lens by thermoluminescent dosimetry in the children with acute lymphoblastic leukemia treated by prophylactic cranial irradiation. Ten patients treated at Division of Radiation Oncology, Department of Radiology, Siriraj Faculty of Medicine from January 1999 to May 1999 were included. The dose measured by 5 degrees posterior angle of the opposed lateral beams was less than 2 % decreased compared to that without angling beams. The mean calculated doses to the lens in this study were in the range of 135 — 263 cGy for the whole course of treatment. The clinical effect on this organ need to be further followed -up.
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