نتایج جستجو برای: dosimetry protocols

تعداد نتایج: 108295  

2012
Juan Azorín Nieto Juan Azorin Nieto

Radiation dosimetry is fundamental in Medical Physics, involving patients and phantom dosimetry. In both cases thennoluminescence dosimetry (TLD) is the most appropriate technique for measuring the absorbed dose. In this paper thennoluminescence phenomenon as well as the use of TLD in radiodiagnosis and radiotherapy for in vivo or in phantom measurements is discussed. Some results of measuremen...

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Journal: :Journal of Visualized Experiments 2021

The importance of dosimetry protocols and standards for radiobiological studies is self-evident. Several have been proposed dose determination using low energy X-ray facilities, but depending on the irradiation configurations, samples, materials or beam quality, it sometimes difficult to know which protocol most appropriate employ. We, therefore, propose a cell irradiations facility. aim this m...

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Journal: :Medical physics 2002
M Saiful Huq

Task Group 51 (TG51), of the Radiation Therapy Committee of the American Association of Physicists in Medicine (AAPM), has developed a calibration protocol for high-energy photon and electron therapy beams based on absorbed dose standards. This protocol is intended to replace the air-kerma based protocol developed by an earlier AAPM task group (TG21). Conversion to the newer protocol introduces...

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Journal: :Physics in medicine and biology 2004
Antonio Lopez Medina Antonio Teijeiro Francisco Salvador Daniela Medal Julio Vazquez Manuel Salgado María C Carrion

Two dosimetry protocols based on absorbed dose to water have recently been implemented: TG-51 and TRS-398. These protocols use different beam-quality indices: %dd(10)x and TPR20,10. The effect of electron contamination in measurements of %dd(10)x has been proposed as a disadvantage of the TG-51. For actual measurements of %dd(10)x in five clinical beams (Primus 6-18 MV, SL-75/5 6 MV, SL-18 6-15...

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Journal: :Journal of physics. Conference series 2009
Hs Sakhalkar D Sterling J Adamovics G Ibbott M Oldham

An urgent requirement for 3D dosimetry has been recognized because of high failure rate (~25%) in RPC credentialing, which relies on point and 2D dose measurements. Comprehensive 3D dosimetry is likely to resolve more errors and improve IMRT quality assurance. This work presents an investigation of the feasibility of PRESAGE/optical-CT 3D dosimetry in the Radiologic Physics Center (RPC) IMRT H&...

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Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2011
Michael G Stabin Robert M Sharkey Jeffry A Siegel

There is a long history of absorbed dose calculations being performed to evaluate the risks involved in the application of radiopharmaceuticals to medical studies. In the 1940s, Marinelli, Quimby, and Hine (1–3) published a set of articles that presented a summary and approach to radionuclide dosimetry. In 1956 Loevinger et al. (4) summarized the field at that point, and then in 1968 the newly ...

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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...

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Journal: :Radiation protection dosimetry 2011
E A Ainsbury E Bakhanova J F Barquinero M Brai V Chumak V Correcher F Darroudi P Fattibene G Gruel I Guclu S Horn A Jaworska U Kulka C Lindholm D Lloyd A Longo M Marrale O Monteiro Gil U Oestreicher J Pajic B Rakic H Romm F Trompier I Veronese P Voisin A Vral C A Whitehouse A Wieser C Woda A Wojcik K Rothkamm

The current focus on networking and mutual assistance in the management of radiation accidents or incidents has demonstrated the importance of a joined-up approach in physical and biological dosimetry. To this end, the European Radiation Dosimetry Working Group 10 on 'Retrospective Dosimetry' has been set up by individuals from a wide range of disciplines across Europe. Here, established and em...

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Journal: :Annali dell'Istituto superiore di sanita 2009
François Trompier Celine Bassinet Albrecht Wieser Cinzia De Angelis Daniela Viscomi Paola Fattibene

Dosimetry based on the detection by electron paramagnetic resonance (EPR) spectroscopy of ionizing radiation-induced radicals is an established method for the retrospective dosimetry of past exposures and the dosimetry of potentially exposed persons in radiological emergencies. The dose is estimated by measuring the physical damage induced in materials contained in objects placed on or next to ...

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2014
Yves De Deene Andrew Jirasek

Three-dimensional (3D) gel dosimetry has a unique role to play in safeguarding conformal radiotherapy treatments as the technique can cover the full treatment chain and provides the radiation oncologist with the integrated dose distribution in 3D. It can also be applied to benchmark new treatment strategies such as image guided and tracking radiotherapy techniques. A major obstacle that has hin...

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