Intensities of incident and transmitted ultraviolet-a rays through gafchromic films
Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Atsushi Noguchi, Kouichi YabunakaJournal of Medical Physics 2017 42(2):86-89
Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission intensity. Gafchromic EBT3 films were suitable to be used in ...
Source: Journal of Medical Physics - June 16, 2017 Category: Physics Authors: Toshizo Katsuda Rumi Gotanda Tatsuhiro Gotanda Takuya Akagawa Nobuyoshi Tanki Tadao Kuwano Atsushi Noguchi Kouichi Yabunaka Source Type: research
A dosimetric study on slab-pinewood-slab phantom for developing the heterogeneous chest phantom mimicking actual human chest
Om Prakash Gurjar, Radha Kishan Paliwal, Surendra Prasad MishraJournal of Medical Physics 2017 42(2):80-85
The aim is to study the density, isodose depths, and doses at different points in slab-pinewood-slab (SPS) phantom, solid phantom SP34 (made up of polystyrene), and chest level of actual patient for developing heterogeneous chest phantom mimicking thoracic region of human body. A 6 MV photon beam of field size of 10 cm×10 cm was directed perpendicular to the surface of computed tomography (CT) images of chest level of patient, SPS phantom, and SP34 phantom. Dose was calculated using anisotropic analytical...
Source: Journal of Medical Physics - June 16, 2017 Category: Physics Authors: Om Prakash Gurjar Radha Kishan Paliwal Surendra Prasad Mishra Source Type: research
Monte carlo calculation of beam quality and phantom scatter corrections for lithium formate electron paramagnetic resonance dosimeter for high-energy brachytherapy dosimetry
Conclusion: KQQ0 (r) is about unity and distance independent for 60Co, 137Cs and 192Ir brachytherapy sources. Phantoms such as solid water, virtual water, RW1, RW3 and WE210 are water-equivalent for 60Co, 137Cs and 192Ir brachytherapy sources. For 169Yb source, all the investigated phantoms show distance-dependent Kphan (r) values. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 16, 2017 Category: Physics Authors: Subhalaxmi Mishra T Palani Selvam Source Type: research
Beam characterization of 10-MV photon beam from medical linear accelerator without flattening filter
Conclusion: Therefore, for clinical use, a metal filter is additionally required to reduce the effects of the electron contamination. The mean energy of the FFF linac was found to be lower than that of the FF linac owing to the absence of beam hardening caused by the FF. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 16, 2017 Category: Physics Authors: Tomohiro Shimozato Yuichi Aoyama Takuma Matsunaga Katsuyoshi Tabushi Source Type: research
Investigating the electronic portal imaging device for small radiation field measurements
Conclusions: EPID is a viable option for profile and output factor measurements for field sizes down to 2 cm×2 cm in the absence of appropriate small field dosimeters. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 16, 2017 Category: Physics Authors: Arpita Agarwal Nikhil Rastogi KJ Maria Das SA Yoganathan D Udayakumar Shaleen Kumar Source Type: research
