dose measurements of parotid glands and spinal cord in conventional treatment of nasopharyngeal carcinoma using rando phantom and thermoluminescent dosimeters

نویسندگان

mohammad taghi bahreyni toossi medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran

چکیده

introduction radiotherapy is regarded as the first treatment of choice for nasopharyngeal carcinoma. despite the advantages of radiotherapy, patients may suffer from a wide range of side-effects due to the presence of many sensitive normal tissues in these regions. if the absorbed dose exceeds the tolerance level in parotid glands and the spinal cord, myelopathy, lhermitte's sign and xerostomia cannot be avoided. materials and methods the head and neck of a rando phantom (reference man), which was regarded as a hypothetical patient with nasopharyngeal carcinoma was evaluated. the full course of treatment consisted of three phases. at the beginning of each phase, an oncologist marked conventional fields on the rando phantom using a simulator. for measuring the absorbed dose, thermoluminescent dosimeters(tld) chips (tld-100) were utilized.the absorbed dose by tlds was read by harshaw 3500 tld reader. results the total absorbed dose was calculated by measuring the absorbed dose in each phase, multiplied by the fraction numbers of each phase; the obtained values were summed up. the results showed that the received doses by spinal cord ranged from 15.24 to 54.56 gy. also, the absorbed dose of parotid glands was approximately 39.23 gy. conclusion considering the minimum tolerance dose the absorbed doses in the spinal cord and parotid glands were above the tolerance level. the incidence rate of xerostomia and myelopathy were higher in patients, treated by conventional methods.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Dose Measurements of Parotid Glands and Spinal Cord in Conventional Treatment of Nasopharyngeal Carcinoma Using RANDO Phantom and Thermoluminescent Dosimeters

Introduction Radiotherapy is regarded as the first treatment of choice for nasopharyngeal carcinoma. Despite the advantages of radiotherapy, patients may suffer from a wide range of side-effects due to the presence of many sensitive normal tissues in these regions. If the absorbed dose exceeds the tolerance level in parotid glands and the spinal cord, myelopathy, Lhermitte's sign and xerostomia...

متن کامل

Dose Measurements of Parotid Glands and Spinal Cord in Conventional Treatment of Nasopharyngeal Carcinoma Using RANDO Phantom and Thermoluminescent Dosimeters

Introduction Radiotherapy is regarded as the first treatment of choice for nasopharyngeal carcinoma. Despite the advantages of radiotherapy, patients may suffer from a wide range of side-effects due to the presence of many sensitive normal tissues in these regions. If the absorbed dose exceeds the tolerance level in parotid glands and the spinal cord, myelopathy, Lhermitte's sign and xerostomia...

متن کامل

An Assessment of Spinal Cord Dose Following Radiotherapy of Nasopharyngeal Cancer by TLD and Rando Phantom

Introduction: Nasopharyngeal carcinoma is one of the most common malignancies in the head and neck region and radiotherapy is its treatment of choice. In spite of the fact that it is widely used, due to the presence of many sensitive organs or tissues in this region, patients may suffer from a wide range of side effects. One such sensitive tissue is the spinal cord. If the absorbed dose to spin...

متن کامل

an assessment of spinal cord dose following radiotherapy of nasopharyngeal cancer by tld and rando phantom

introduction: nasopharyngeal carcinoma is one of the most common malignancies in the head and neck region and radiotherapy is its treatment of choice. in spite of the fact that it is widely used, due to the presence of many sensitive organs or tissues in this region, patients may suffer from a wide range of side effects. one such sensitive tissue is the spinal cord. if the absorbed dose to spin...

متن کامل

Dose measurements in intraoral radiography using thermoluminescent dosimeters

The use of X-ray in medicine demands to expose the patient and the professional to the lowest radiation doses available in agreement with ALARA philosophy. The reference level for intraoral dental radiography is 7 mGy and, in Mexico, a number of examinations of this type are performed annually. It is considered that approximately 25% of all the X-rays examinations carried out in our country cor...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
iranian journal of medical physics

جلد ۱۲، شماره ۲، صفحات ۷۸-۸۴

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023