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Journal of Medical Physics

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https://www.readbyqxmd.com/read/28405111/erratum-clinical-implications-of-eclipse-analytical-anisotropic-algorithm-and-acuros-xb-algorithm-for-the-treatment-of-lung-cancer
#1
(no author information available yet)
[This corrects the article on p. 219 in vol. 41, PMID: 28144113.].
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405110/issue-of-in-water-calibration-certificate-for-cobalt-beam-quality-at-10-cm-reference-depth-is-it-admissible-under-trs-398-protocol
#2
Ramamoorthy Ravichandran
No abstract text is available yet for this article.
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405109/bystander-effect-and-second-primary-cancers-following-radiotherapy-what-are-its-significances
#3
Masoud Najafi, Ashkan Salajegheh, Abolhasan Rezaeyan
No abstract text is available yet for this article.
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405108/assessment-of-regional-pediatric-computed-tomography-dose-indices-in-tamil-nadu
#4
A Saravanakumar, K Vaideki, K N Govindarajan, S Jayakumar, B Devanand
The aim of this article is to assess Tamil Nadu pediatric computed tomography (CT) diagnostic reference levels (DRLs) by collecting radiation dose data for the most commonly performed CT examinations. This work was performed for thirty CT scanners installed in various parts of the Tamil Nadu region. The patient cohort was divided into two age groups: <1 year, and 1-5 years. CT dose indices were measured using a 10 cm(3) pencil ion chamber with pediatric head and body polymethyl methacrylate phantoms. Dose data such as volumetric CT dose index (CTDIv) and dose length product (DLP) on a minimum of twenty average-sized pediatric patients in each category were recorded to calculate a mean site CTDIv and DLP value...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405107/response-of-nanodot-optically-stimulated-luminescence-dosimeters-to-therapeutic-electron-beams
#5
Y Retna Ponmalar, Ravikumar Manickam, S Sathiyan, K M Ganesh, R Arun, Henry Finlay Godson
Response of Al2O3:C-based nanoDot optically stimulated luminescence (OSL) dosimeter was studied for the dosimetry of 6, 9, 12, 16, and 20 MeV therapeutic electron beams. With reference to ionization chamber, no change in the response was observed with the change in the energy of electron beams for the field size from 6 cm × 6 cm to 25 cm × 25 cm, dose rates from 100 MU/min to 600 MU/min, and the linearity in the response up to 300 cGy. The fading of the transient signal was higher for 20 MeV electron beam than that of 6 MeV electron beam by about 5% as compared to value at 20 min after irradiation...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405106/evaluation-of-intensity-modulated-radiation-therapy-delivery-system-using-a-volumetric-phantom-on-the-basis-of-the-task-group-119-report-of-american-association-of-physicists-in-medicine
#6
Raphaela Avgousti, Christina Armpilia, Ioannis Floros, Christos Antypas
The current work describes the implementation of the American Association of Physicists in Medicine (AAPM)'s Task Group 119 report on a volumetric phantom (Delta(4), Scandidos, Uppsala, Sweden) following the stated dose goals, to evaluate the step-and-shoot intensity modulated radiation therapy (IMRT) system. Delta(4) consists of diode detectors, lying on two crossed planes, measuring the delivered dose, and providing two-dimensional dosimetric information. Seven plans of different goals and complexity were performed, with individual structure sets...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405105/hesperidin-as-radioprotector-against-radiation-induced-lung-damage-in-rat-a-histopathological-study
#7
Gholam Hassan Haddadi, Abolhasan Rezaeyan, Mohammad Amin Mosleh-Shirazi, Massood Hosseinzadeh, Reza Fardid, Masoud Najafi, Ashkan Salajegheh
Reactive oxygen species (ROS) are generated by ionizing radiation, and one of the organs commonly affected by ROS is the lung. Radiation-induced lung injury including pneumonia and lung fibrosis is a dose-limiting factor in radiotherapy (RT) of patients with thorax irradiation. Administration of antioxidants has been proved to protect against ROS. The present study was aimed to assess the protective effect of hesperidin (HES) against radiation-induced lung injury of male rats. Fifty rats were divided into three groups...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405104/structural-shielding-design-of-a-6-mv-flattening-filter-free-linear-accelerator-indian-scenario
#8
Bibekananda Mishra, T Palani Selvam, P K Dash Sharma
Detailed structural shielding of primary and secondary barriers for a 6 MV medical linear accelerator (LINAC) operated with flattening filter (FF) and flattening filter free (FFF) modes are calculated. The calculations have been carried out by two methods, one using the approach given in National Council on Radiation Protection (NCRP) Report No. 151 and the other based on the monitor units (MUs) delivered in clinical practice. Radiation survey of the installations was also carried out. NCRP approach suggests that the primary and secondary barrier thicknesses are higher by 24% and 26%...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405103/comparison-of-rapid-arc-and-intensity-modulated-radiotherapy-plans-using-unified-dosimetry-index-and-the-impact-of-conformity-index-on-unified-dosimetry-index-evaluation
#9
Jayapalan Krishnan, Jayarama Shetty, Suresh Rao, Sanath Hegde, C Shambhavi
The aim of this study was to evaluate the impact of conformity index in the unified dosimetry index (UDI) score for two different planning techniques namely intensity-modulated radiotherapy (IMRT) and Rapid Arc. Rapid Arc and IMRT plans of 57 patients were evaluated and compared using UDI score which incorporates four indices. To determine the impact of conformity index on the IMRT and Rapid Arc plans, UDI at conformity index one of all plan (UDIunit_CI) score was calculated by assuming conformity index is equal to one...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405102/measurement-of-total-scatter-factor-for-stereotactic-cones-with-plastic-scintillation-detector
#10
Suresh H Chaudhari, Rishabh Dobhal, Rajesh A Kinhikar, Sudarshan S Kadam, Deepak D Deshpande
Advanced radiotherapy modalities such as stereotactic radiosurgery (SRS) and image-guided radiotherapy may employ very small beam apertures for accurate localized high dose to target. Accurate measurement of small radiation fields is a well-known challenge for many dosimeters. The purpose of this study was to measure total scatter factors for stereotactic cones with plastic scintillation detector and its comparison against diode detector and theoretical estimates. Measurements were performed on Novalis Tx(™) linear accelerator for 6MV SRS beam with stereotactic cones of diameter 6 mm, 7...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28405101/the-feasibility-study-of-a-hybrid-coplanar-arc-technique-versus-hybrid-intensity-modulated-radiotherapy-in-treatment-of-early-stage-left-sided-breast-cancer-with-simultaneous-integrated-boost
#11
Yuan-Gui Chen, An-Chuan Li, Wen-Yao Li, Miao-Yun Huang, Xiao-Bo Li, Ming-Qiu Chen, Mutian Zhang, Ben-Hua Xu
This study demonstrated the feasibility and advantages of a hybrid, volumetric arc therapy technique that used two 90° coplanar arcs and two three-dimensional conformal tangential beams in the simultaneous-integrated boost radiotherapy of left-sided breast cancer after breast-conserving surgery. A total of nine patients with stage I, left-sided breast cancer who underwent breast-conserving surgery were selected for this retrospective study. For each patient, a hybrid arc plan was generated and then compared with two hybrid intensity-modulated radiotherapy plans...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144121/erratum-dosimetric-and-radiobiological-characterizations-of-prostate-intensity-modulated-radiotherapy-and-volumetric-modulated-arc-therapy-a-single-institution-review-of-ninety-cases
#12
(no author information available yet)
[This corrects the article on p. 162 in vol. 41, PMID: 27651562.].
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144120/simplified-method-for-creating-a-density-absorbed-dose-calibration-curve-for-the-low-dose-range-from-gafchromic-ebt3-film
#13
Tatsuhiro Gotanda, Toshizo Katsuda, Rumi Gotanda, Tadao Kuwano, Takuya Akagawa, Nobuyoshi Tanki, Akihiko Tabuchi, Tetsunori Shimono, Yasuyuki Kawaji
Radiochromic film dosimeters have a disadvantage in comparison with an ionization chamber in that the dosimetry process is time-consuming for creating a density-absorbed dose calibration curve. The purpose of this study was the development of a simplified method of creating a density-absorbed dose calibration curve from radiochromic film within a short time. This simplified method was performed using Gafchromic EBT3 film with a low energy dependence and step-shaped Al filter. The simplified method was compared with the standard method...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144119/erratum-measurement-of-eye-lens-dose-for-varian-on-board-imaging-with-different-cone-beam-computedtomography-acquisition-techniques
#14
(no author information available yet)
[This corrects the article on p. 177 in vol. 41, PMID: 27651564.].
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144118/a-partial-differential-equation-based-general-framework-adapted-to-rayleigh-s-rician-s-and-gaussian-s-distributed-noise-for-restoration-and-enhancement-of-magnetic-resonance-image
#15
Ram Bharos Yadav, Subodh Srivastava, Rajeev Srivastava
The proposed framework is obtained by casting the noise removal problem into a variational framework. This framework automatically identifies the various types of noise present in the magnetic resonance image and filters them by choosing an appropriate filter. This filter includes two terms: the first term is a data likelihood term and the second term is a prior function. The first term is obtained by minimizing the negative log likelihood of the corresponding probability density functions: Gaussian or Rayleigh or Rician...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144117/a-monte-carlo-study-on-quantifying-the-amount-of-dose-reduction-by-shielding-the-superficial-organs-of-an-iranian-11-year-old-boy
#16
Parisa Akhlaghi, Elie Hoseinian-Azghadi, Hashem Miri-Hakimabad, Laleh Rafat-Motavalli
A method for minimizing organ dose during computed tomography examinations is the use of shielding to protect superficial organs. There are some scientific reports that usage of shielding technique reduces the surface dose to patients with no appreciable loss in diagnostic quality. Therefore, in this Monte Carlo study based on the phantom of a 11-year-old Iranian boy, the effect of using an optimized shield on dose reduction to body organs was quantified. Based on the impact of shield on image quality, lead shields with thicknesses of 0...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144116/a-method-to-obtain-correct-standard-uptake-values-in-pinnacle-treatment-planning-system-for-target-volume-delineation
#17
Farshid Salehzahi, Jason Tse, Jonathan Lee, Jothybasu Selvaraj
Standardized uptake value (SUV) is an advanced tool for quantitative tumor identification and metabolic target volume delineation (TVD) in diagnostic and therapeutic settings. It is thus important to establish a quality assured process to maintain the traceability of data correctly by positron emission tomography (PET) systems. Patient administration of (18)fluoro-deoxy-glucose is increasingly delivered by automated infusion systems (AISs). Whenever AIS is used, its accuracy and traceability measurement need verification...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144115/dosimetric-evaluation-of-newly-developed-well-type-ionization-chamber-for-use-in-the-calibration-of-brachytherapy-sources
#18
Sathiyan Saminathan, Henry Finlay Godson, Retna Ponmalar, Ravikumar Manickam, James Mazarello
The well-type ionization chamber has been designed for convenient use in brachytherapy source strength calibration. The chamber has a volume of 240 cm(3), weight of 2.5 kg, and is open to atmospheric conditions. The well-type ionization chamber dosimetric characteristics such as leakage current, stability, scattering effect, ion collection efficiency, and nominal response with energy were studied. The evaluated dosimetric characteristics of well-type ionization chamber were compared with two other commercially available well-type ionization chambers...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144114/on-line-estimations-of-delivered-radiation-doses-in-three-dimensional-conformal-radiotherapy-treatments-of-carcinoma-uterine-cervix-patients-in-linear-accelerator
#19
Suman Kumar Putha, P U Saxena, S Banerjee, Challapalli Srinivas, B M Vadhiraja, Ramamoorthy Ravichandran, Mary Joan, K Dinesh Pai
Transmission of radiation fluence through patient's body has a correlation to the planned target dose. A method to estimate the delivered dose to target volumes was standardized using a beam level 0.6 cc ionization chamber (IC) positioned at electronic portal imaging device (EPID) plane from the measured transit signal (St) in patients with cancer of uterine cervix treated with three-dimensional conformal radiotherapy (3DCRT). The IC with buildup cap was mounted on linear accelerator EPID frame with fixed source to chamber distance of 146...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144113/clinical-implications-of-eclipse-analytical-anisotropic-algorithm-and-acuros-xb-algorithm-for-the-treatment-of-lung-cancer
#20
Gangarapu Sri Krishna, Vuppu Srinivas, Palreddy Yadagiri Reddy
The aim of the present study was to investigate the dose-volume variations of planning target volume (PTV) and organs at risks (OARs) in 15 left lung cancer patients comparing analytical anisotropic algorithm (AAA) versus Acuros XB algorithm. Originally, all plans were created using AAA with a template of dose constraints and optimization parameters, and the patients were treated using intensity modulated radiotherapy. In addition, another set of plans was created by performing only dose calculations using Acuros algorithm without doing any reoptimization...
October 2016: Journal of Medical Physics
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