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J Korean Soc Ther Radiol > Volume 8(1); 1990 > Article
Journal of the Korean Society for Therapeutic Radiology 1990;8(1): 125-132.
Dose Attenuation in the Mid-Cranial Fossa with 6 MV hoton Beam Irradiations
Jeong Ho Park, Tae Jin Choi, Ok Bae Kim
Department of Radiotion Oncology, College of Medicine, Keimyung University, Taegu, Korea.
In X-ray irradiation, dose distribution depends on multiple parameters, one of them being tissue inhomogeneity to change the dose significantly. Cpnsoderable dose attenuation through the mid-cranial fossa is expected because of various bony structures in it. Dose distribution around the mid-cranial fossa, following irradiation with 6 MV photon beam, was measured with LiF TLD micro-rod, and compared with the expected dose in the same sites. In our calculation with Cf(correction factor), the expected dose attenuation revealed about 3.74% per 1cm thickness of bone tissue. And the differences between the expected dose with correction for bone tissue and the measured dose by TLD was small, agreeing within an average variation of+/-0.21%.
Key Words: Bone correction factor, TLD, Mid-cranial fossa
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