نتایج جستجو برای: Diode Dosimeter

تعداد نتایج: 23008  

Journal: :basic and clinical cancer research 0
alireza mohammadkarim department of engineering, science and research branch, islamic azad university, tehran, iran mahmoud allahverdi department of medical physics, tehran university of medical science, tehran, iran mahbod esfehani radiotherapeutic oncology department of cancer institute hasanali nedaie department of radiotherapy, tehran university of medical science, tehran, iran alireza shirazi department of medical physics, tehran university of medical science, tehran, iran

background: delivering the maximum dose to tumor while achieving the minimum dose delivery to normal tissue; is the most important goal in external radiotherapy. diode in vivo dosimetry is widely considered to be an important tool for quality improvement of patient care in external radiotherapy. uncertainty in dose delivery should fall within 5% of the prescribed dose as recommended by internat...

Journal: :iranian journal of medical physics 0
alireza mohammadkarim department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran ph.d student, department of medical physics, faculty of medical sciences, tarbiat modares university, tehran, iran hasan ali nedaie department of radiotherapy, oncology and medical physics, tehran university of medical sciences, tehran, iran mahmoud allahverdi department of medical physics, tehran university of medical sciences, tehran, iran mahbod esfehani department of radiation oncology, cancer institute of iran, tehran university of medical sciences, tehran, iran alireza shirazi department of medical physics, tehran university of medical sciences, tehran, iran ghazale geraily department of medical physics, tehran university of medical sciences, tehran, iran

introduction evaluation of the delivered dose of externally wedged photon beams by external diode dosimeters during the treatment process requires the estimation of exit surface dose correction factors in various wedge angles and field sizes. materials and methods a system of absorbed dose evaluation, using p-type diode dosimeters placed on the exit surface of a phantom, was characterized for e...

Journal: :Medical dosimetry : official journal of the American Association of Medical Dosimetrists 2012
Matthew T Studenski Ying Xiao Amy S Harrison

Recently in our clinic, we have seen an increased number of patients presenting with pacemakers and defibrillators. Precautions are taken to develop a treatment plan that minimizes the dose to the pacemaker because of the adverse effects of radiation on the electronics. Here we analyze different dosimeters to determine which is the most accurate in measuring pacemaker or defibrillator dose whil...

Introduction Evaluation of the delivered dose of externally wedged photon beams by external diode dosimeters during the treatment process requires the estimation of exit surface dose correction factors in various wedge angles and field sizes. Materials and Methods A system of absorbed dose evaluation, using p-type diode dosimeters placed on the exit surface of a phantom, was characterized for e...

2016
Alireza Mohammadkarim Hasan Ali Nedaie Mahmoud Allahverdi Mahbod Esfehani Alireza Shirazi Ghazale Geraily

Introduction Evaluation of the delivered dose of externally wedged photon beams by external diode dosimeters during the treatment process requires the estimation of exit surface dose correction factors in various wedge angles

2016
Saeed Ahmed Benjamin Nelms Jakub Kozelka Geoffrey Zhang Eduardo Moros Vladimir Feygelman

The original helical ArcCHECK (AC) diode array and associated software for 3D measurement-guided dose reconstruction were characterized and validated; however, recent design changes to the AC required that the subject be revisited. The most important AC change starting in 2014 was a significant reduction in the overresponse of diodes to scattered radiation outside of the direct beam, accom-plis...

Journal: :journal of biomedical physics and engineering 0
s a rahimi tarbiat modares university b hashemi tarbiat modares university s r mahdavi iran university of medical sciences

background: estimating dosimetric parameters for small fields under non-reference conditions leads to significant errors if done based on conventional protocols used for large fields in reference conditions. hence, further correction factors have been introduced to take into account the influence of spectral quality changes when various detectors are used in non-reference conditions at differen...

A. Sharafi, A. Shirazi, Gh. Geraily, M. Allahverdi, M. Esfehani,

Background: Total Body Irradiation (TBI) is different from standard radiotherapy in many aspects, so it is not easy to predict the delivered dose to the patient under TBI treatment. Diode dosimetry procedures for surface dose reading can help to define variations of the actually delivered dose from the prescribed one. The aim of this study was to describe the measurements made to calib...

2005
Patrick Cadman Todd McNutt Karl Bzdusek

A new Pinnacle 3D treatment-planning system software release has recently become available (v7.4, Philips Radiation Oncology Systems, Milpitas, CA), which supports modeling of rounded multileaf collimator (MLC) leaf ends; it also includes a number of other software enhancements intended to improve the overall dose calculation accuracy. In this report, we provide a general discussion of the dose...

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