نتایج جستجو برای: pagata gel dosimeter

تعداد نتایج: 106920  

Journal: :iranian journal of radiation research 0
mahbod sedaghat department of medical physics, tehran university of medical sciences, tehran, iran m.h. zahmatkesh r. jaberi sh. akhlaghpoor m. allahverdi

abstractbackground: polymer gels are an emerging new class of dosimeters which are being applied to the challenges of modern radiotherapy modalities. research on gel dosimetry involves several scientific domains, one of which is the imaging techniques with which dose data is extracted from the dosimeters. in the current work, we present our preliminary results of investigating capability of x-r...

2013
N. Malathi P. Sahoo K. Praveen N. Murali

The paper presents an innovative approach towards development of real time dosimetry using a chemical dosimeter for measurement of absorbed radiation dose in the range between 1 and 400 Gy. Saturated chloroform solution in water, a well known chemical dosimeter, is used to demonstrate the concept of online measurement of radiation dose. The measurement approach involves online monitoring of inc...

Journal: :iranian journal of medical physics 0
hamid reza sadoughi m.sc. student of medical physics, medical physics dept., tehran university of medical sciences, tehran, iran mahmood allahverdi associate professor, medical physics dept., tehran university of medical sciences, and radiotherapy physics department of cancer institute, tehran, iran hasan nedaei assistant professor, radiotherapy physics dept., cancer institute, tehran, iran ramin jaberi radiotherapy physicist, radiotherapy physics dept., cancer institute, tehran, iran mahbod esfahani radiotherapy physicist, radiotherapy physics dept., cancer institute, tehran, iran alireza shirazi associated professor, medical physics dept., tehran university of medical sciences, tehran, iran

introduction: multiple fields and presence of heterogeneities create complex dose distributions that need three dimensional dosimetry. in this work, we investigated mr-based magic gel dosimetry as a three-dimensional dosimetry technique to measure the delivered dose to bladder and rectum in prostate radiation therapy. materials and methods: a heterogeneous slab phantom including bones was made....

Journal: :iranian journal of radiation research 0
w. parwaie department of radiology, faculty of para-medicine, hormozgan university of medical sciences, bandar abbas, iran m. yarahmadi department of medical physics, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran h.a. nedaie department of radiotherapy, cancer institute, tehran university of medical sciences, tehran, iran m.h. zahmatkesh shahid beheshti university of medical sciences, tehran, iran a.h. barati department of medical physics, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran m. afkhami department of radiology, faculty of para-medicine, hormozgan university of medical sciences, bandar abbas, iran

background: accurate small radiation field dosimetry is essential in modern radiotherapy techniques such as stereotactic radiosurgery (srs) and intensity modulated radiotherapy (imrt). precise measurement of dosimetric parameters such as beam profile, percentage depth doses and output factor of these beams are complicated due to the electron disequilibrium and the steep dose gradients. in the p...

Hasan Nedaie Hossein Hasani, Mahmood Allahverdi Mohammad Hasan Zahmatkesh Saeid Bagheri Sajad Mirzaie

Introduction: In radiotherapy, methods of treatment planning are becoming increasingly more complicated. This requires verification of the doses delivered to increasingly smaller and more precise regions. Radiotherapy techniques are continuously employing smaller and smaller field sizes to deliver tighter radiation doses with higher therapeutic ratios, generating interest among researchers to p...

Journal: :Physics in medicine and biology 2016
Luc Beaulieu Sam Beddar

While scintillation dosimetry has been around for decades, the need for a dosimeter tailored to the reality of modern radiation therapy-in particular a real-time, water-equivalent, energy-independent dosimeter with high spatial resolution-has generated renewed interest in scintillators over the last 10 years. With the advent of at least one commercial plastic scintillation dosimeter and the eve...

Journal: :Physics in medicine and biology 2016
V Spěváček K Pilařová J Končeková O Konček

Journal: :Physics in medicine and biology 2009
Stephen G Bosi Saxby Brown Sarvenaz Sarabipour Yves De Deene Clive Baldock

A gelatin phantom containing an optically scattering funnel-shaped region of elevated optical density (OD) was used to examine light-scattering-induced artefacts in a cone-beam optical CT scanner used for gel dosimetry. To simulate polymer gel dosimeters, the opacity was introduced by adding a colloidal scatterer to the gelatin. Scatter results in an underestimate of OD (hence dose). In line pr...

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