نتایج جستجو برای: MAGIC-f gel dosimetry

تعداد نتایج: 424065  

Journal: :iranian journal of medical physics 0
hossein hasani m.sc. student in medical radiation engineering, science and research branch, islamic azad university, tehran, iran hasan nedaie assistant professor, radiotherapy and oncology dept., tehran university of medical sciences, cancer research center, center institute, tehran, iran mohammad hasan zahmatkesh associate professor, medical physics dept., novin medical radiation institute, tehran, iran mahmood allahverdi associate professor, medical physics dept., tehran university of medical sciences, tehran, iran saeid bagheri m.sc. of medical physics, novin medical radiation institute, shahid beheshti university, tehran, iran sajad mirzaie m.sc. student in medical radiation engineering, science and research branch, islamic azad university, tehran, iran

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: :iranian journal of medical physics 0
mohammad taghi bahreyni toossi professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran ghorban safaeian m.sc., in medical physics, mashhad university of medical sciences, mashhad, iran mohammad hosein bahreyni toossi professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran shahram baiani m.sc., in medical engineering, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran

introduction: the purpose of this work was to study the ability of mri normoxic polymer gel dosimetry for evaluating the dose distribution in hdr brachytherapy of esophagial cancer at imam reza brachytherapy center (mashhad, iran). materials and methods: initially, 2liters of normoxic gel (magic) was fabricated and then poured into 12 calibration test tubes and placed in a perspex walled phanto...

Ahmad Mostaar, Mohammad Houshyari Saeede Amiri

Introduction: In radiotherapy, treatment planning methods are evaluating and transforming every day, so precision in calculation and determination of dose delivery process is performing more important role in radiotherapy than past. In modern radiotherapy treatments, deramatically increase of small fields utilization, causes the polymeric gels has known as the most reliable dos...

Ahmad Farahani Behrooz Reafie Hassan Hashemi Leaila Karimi-Afshar Mahmoud Allahverdi, Mohammadreza Ay Morteza Bakhteiari Nader Riahi Alam Tayeb Alahverdi purfallah

Introduction: Computed tomography (CT) has numerous applications in clinical procedures but its main problem is its high radiation dose to the patients compared to other imaging modalities using x-ray. CT delivers approximately high doses to the nearby tissues due to the scattering effect, fan beam (beam divergence) and limited collimator efficiency. The radiation dose from multi-slice scanners...

Ghorban Safaeian Mohammad Hosein Bahreyni Toossi Mohammad Taghi Bahreyni Toossi, Shahram Baiani

Introduction: The purpose of this work was to study the ability of MRI normoxic polymer gel dosimetry for evaluating the dose distribution in HDR brachytherapy of esophagial cancer at Imam Reza brachytherapy center (Mashhad, Iran). Materials and Methods: Initially, 2liters of normoxic gel (MAGIC) was fabricated and then poured into 12 calibration test tubes and placed in a perspex walled phanto...

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....

A.H. Barati, H.A. Nedaie, M. Afkhami, M. Yarahmadi, M.H. Zahmatkesh, W. Parwaie,

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...

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...

2010
T. Marques C. Garrido V. Zucolotto

In this work gold nanoparticles (AuNP) were embedded in MAGIC-f gel and irradiated in a 250 kV x-ray clinical beam. The signal of non-irradiated gel samples containing AuNPs showed maximum difference of 0.5% related to gel without nanoparticles. Different AuNPs concentrations were studied: 0.10 mM, 0.05 mM and 0.02 mM, presenting dose enhancements of 106%, 90% and 77% respectively. Monte Carlo ...

Alireza Shirazi, Hamid Reza Sadoughi Hasan Nedaei Mahbod Esfahani Mahmood Allahverdi Ramin Jaberi

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....

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