a new method for ideal dose distribution of two adjacent fields for external beam radiation therapy

نویسندگان

m.j. tahmasebi birgani medical physics and radiation therapy departments, jundishapur university of medicalsciences, ahwaz, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی جندی شاپور اهواز (ahvaz jundishapur university of medical sciences)

m. ansari radiation therapy department, jundishapur university of medical sciences, ahwaz, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی جندی شاپور اهواز (ahvaz jundishapur university of medical sciences)

m.a. behrooz medical physics department, jundishapur university of medical sciences, ahwaz, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی جندی شاپور اهواز (ahvaz jundishapur university of medical sciences)

چکیده

abstract background: adjacent treatment fields are commonly used in external beam radiation therapy, such as mantle and inverted-y fields for the treatment of hodgkin’s disease and craniospinal fields used in the treatment of medulloblastoma and head and neck tumors when the lateral neck fields are placed adjacent to the anterior supraclavicular field. in each of these situations, there is a possibility of introducing very large dosage errors across the junction. consequently, this region is at risk for severe complications if it is overdosed, or tumor recurrence if it is underdosed. methods: for prevention of adjacent field overlapping a new method is introduced. in this method the patient’s couch of the treatment machine is rotated for 90º clockwise and counterclockwise. then the gantry is rotated for α and β that are measured by geometrical methods in opposite direction for each field. the adjacent fields have a common edge and then the overlap region in treatment volume is eliminated. results: by phantom dosimetry, the maximum dose in the junctional volume of the two adjacent treatment fields is measured to be 102%. this technique provides an inhomogeneity of about 2%. conclusion: in some cases, the measurements have shown that the dose inhomogeneity is as large as 45%. compared with the dynamic intensity-modulated radiotherapy (imrt), this technique also provides a superior dose homogeneity such that inhomogeneity becomes about 2%.

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

A new method for ideal dose distribution of two adjacent fields for external beam radiation therapy

 Abstract Background: Adjacent treatment fields are commonly used in external beam radiation therapy, such as mantle and inverted-Y fields for the treatment of Hodgkin’s disease and craniospinal fields used in the treatment of medulloblastoma and head and neck tumors when the lateral neck fields are placed adjacent to the anterior supraclavicular field. In each of these situations, there is a p...

متن کامل

A new method for ideal dose distribution of two adjacent fields for external beam radiation therapy

Background: Adjacent treatment fields are commonly used in external beam radiation therapy, such as mantle and inverted-Y fields for the treatment of Hodgkin’s disease and craniospinal fields used in the treatment of medulloblastoma and head and neck tumors when the lateral neck fields are placed adjacent to the anterior supraclavicular field. In each of these situations, there is a possibility...

متن کامل

Generating a Homogeneous Dose Distribution in the Junction Region between Two Adjacent Fields in Electron Beam Therapy

Introduction: Treatment with megavoltage electron beams is ideal for irradiating superficial tumors because of their limited range in tissues. However, for electron treatment of extended areas, such as the chest wall, two or more adjacent fields can be used. Abutment of these fields may lead to significant dose in homogeneities in the junction region. The aim of this study is to offer a new met...

متن کامل

Intensity modulated radiation therapy (IMRT) technique for left breast cancer by different numbers of beam fields

Background: Intensity Modulated Radiotherapy (IMRT) can improve radiotherapy (RT) results by improving healthy tissue sparing. Additionally, IMRT provides more consistent dose deliveries and suppresses secondary tumor formation. RT is a principal treatment in breast cancer (BC). Aim: To evaluate the outcome of the Radiotherapy Plans (RTP) that use IMRT technique to left breast and other organs,...

متن کامل

External beam radiation therapy for prostate cancer.

Men with non-metastatic prostate cancer have many treatment options. For over 35 years, radiation therapy has been a mainstay of treatment for this disease. With improvements in technology and better use of pretreatment prognostic factors, such as prostate specific antigen level and Gleason score, biochemical and clinical results have steadily improved. This article reviews the current status o...

متن کامل

Radiation optic neuropathy after external beam radiation therapy for acromegaly.

For diagnosing radiation optic neuropathy (RON) ophthalmological and imaging data were evaluated from 63 acromegalic patients, irradiated between 1967 and 1998. Two patients developed RON: one patient in one optic nerve 10 years and another patient in both optic nerves 5 months after radiation therapy. RON is a rare complication after external beam radiation therapy for acromegaly, which can oc...

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:
medical journal of islamic republic of iran

جلد ۲۰، شماره ۴، صفحات ۱۹۲-۱۹۷

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023