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Journal of Medical Physics

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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
#1
(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
#2
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
#3
(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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/28144112/clinical-implementation-of-an-electron-monitor-unit-dosimetry-system-based-on-task-group-71-report-and-a-commercial-calculation-program
#10
Huijun Xu, Mariana Guerrero, Shifeng Chen, Xiaocheng Yang, Karl Prado, Colleen Schinkel
Many clinics still use monitor unit (MU) calculations for electron treatment planning and/or quality assurance (QA). This work (1) investigates the clinical implementation of a dosimetry system including a modified American Association of Physicists in Medicine-task group-71 (TG-71)-based electron MU calculation protocol (modified TG-71 electron [mTG-71E] and an independent commercial calculation program and (2) provides the practice recommendations for clinical usage. Following the recently published TG-71 guidance, an organized mTG-71E databook was developed to facilitate data access and subsequent MU computation according to our clinical need...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28144111/biological-bases-for-the-revision-of-dose-limits-to-the-eye-lens
#11
EDITORIAL
Srinivasa Badanidiyoor Rao
No abstract text is available yet for this article.
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651568/radiological-risk-assessment-of-cosmic-radiation-at-aviation-altitudes-a-trip-from-houston-intercontinental-airport-to-lagos-international-airport
#12
Paschal Ikenna Enyinna
Radiological risk parameters associated with aircrew members traveling from Houston Intercontinental Airport to Lagos International Airport have been computed using computer software called EPCARD (version 3.2). The mean annual effective dose of radiation was computed to be 2.94 mSv/year. This result is above the standard permissible limit of 1 mSv/year set for the public and pregnant aircrew members but below the limit set for occupationally exposed workers. The Risk of cancer mortality and excess career time cancer risk computed ranged from 3...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651567/analysis-of-dose-distribution-in-organs-at-risk-in-patients-with-prostate-cancer-treated-with-the-intensity-modulated-radiation-therapy-and-arc-technique
#13
Michał Biegała, Adam Hydzik
This study describes a comparative analysis of treatment plans in 48 patients with prostate cancer treated with ionizing radiation. Each patient was subjected to the intensity-modulated radiation therapy (IMRT) and arc technique. In each treatment plan, the organs at risk were assessed: the urinary bladder, rectum and heads of the femur, as well as the volume of normal tissue. The following features were compared: treatment time, conformity indices for the planning target volume, mean doses and standard deviation in organs at risk, and organ volumes for each particular dose...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651566/comparative-study-of-old-and-new-versions-of-treatment-planning-system-using-dose-volume-histogram-indices-of-clinical-plans
#14
Gangarapu Sri Krishna, Vuppu Srinivas, K M Ayyangar, Palreddy Yadagiri Reddy
Recently, Eclipse treatment planning system (TPS) version 8.8 was upgraded to the latest version 13.6. It is customary that the vendor gives training on how to upgrade the existing software to the new version. However, the customer is provided less inner details about changes in the new software version. According to manufacturer, accuracy of point dose calculations and irregular treatment planning is better in the new version (13.6) compared to the old version (8.8). Furthermore, the new version uses voxel-based calculations while the earlier version used point dose calculations...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651565/radioprotective-effects-of-hesperidin-on-oxidative-damages-and-histopathological-changes-induced-by-x-irradiation-in-rats-heart-tissue
#15
Abolhasan Rezaeyan, Gholam Hassan Haddadi, Massood Hosseinzadeh, Maryam Moradi, Masoud Najafi
This study was carried out to evaluate radioprotective effects of hesperidin (HES) administration before the irradiation on the cardiac oxidative stress and histopathological changes in an experimental rat model. The cardiovascular complications of radiation exposure cause morbidity and mortality in patients who received radiotherapy. HES, an antioxidant flavonoid found in citrus fruits, suggests the protection against the tissue damage. Fifty-eight rats were divided into four groups: Group 1 received phosphate buffered saline (PBS) and sham radiation; Group 2, HES and sham radiation; Group 3, PBS and radiation; and Group 4, HES and radiation...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651564/measurement-of-eye-lens-dose-for-varian-on-board-imaging-with-different-cone-beam-computed-tomography-acquisition-techniques
#16
Sudesh Deshpande, Deepak Dhote, Kalpna Thakur, Amol Pawar, Rajesh Kumar, Munish Kumar, M S Kulkarni, S D Sharma, V Kannan
The objective of this work was to measure patient eye lens dose for different cone-beam computed tomography (CBCT) acquisition protocols of Varian's On-Board Imaging (OBI) system using optically stimulated luminescence dosimeter (OSLD) and to study the variation in eye lens dose with patient geometry and distance of isocenter to the eye lens. During the experimental measurements, OSLD was placed on the patient between the eyebrows of both eyes in line of nose during CBCT image acquisition to measure eye lens doses...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651563/gamma-putty-dosimetric-studies-in-electron-beam
#17
Aime M Gloi
Traditionally, lead has been used for field shaping in megavoltage electron beams in radiation therapy. In this study, we analyze the dosimetric parameters of a nontoxic, high atomic number (Z = 83), bismuth-loaded material called Gamma Putty that is malleable and can be easily molded to any desired shape. First, we placed an ionization chamber at different depths in a solid water phantom under a Gamma Putty shield of thickness (t = 0, 3, 5, 10, 15, 20, and 25 mm, respectively) and measured the ionizing radiation on the central axis (CAX) for electron beam ranging in energies from 6 to 20 MeV...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651562/dosimetric-and-radiobiological-characterizations-of-prostate-intensity-modulated-radiotherapy-and-volumetric-modulated-arc-therapy-a-single-institution-review-of-ninety-cases
#18
Muhammad Isa Khan, Runqing Jiang, Alexander Kiciak, Jalil Ur Rehman, Muhammad Afzal, James C L Chow
This study reviewed prostate volumetric-modulated arc therapy (VMAT) plans with intensity-modulated radiotherapy (IMRT) plans after prostate IMRT technique was replaced by VMAT in an institution. Characterizations of dosimetry and radiobiological variation in prostate were determined based on treatment plans of 40 prostate IMRT patients (planning target volume = 77.8-335 cm(3)) and 50 VMAT patients (planning target volume = 120-351 cm(3)) treated before and after 2013, respectively. Both IMRT and VMAT plans used the same dose-volume criteria in the inverse planning optimization...
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27651561/medical-physics-aspects-in-accreditation-of-radiation-oncology-practice
#19
EDITORIAL
Surendra Nath Rustgi
No abstract text is available yet for this article.
July 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27217629/assessment-of-some-image-quality-tests-on-a-128-slice-computed-tomography-scanner-using-a-catphan700-phantom
#20
Eric Naab Manson, John Justice Fletcher, Vivian Della Atuwo-Ampoh, Eric K T Addison, Cyril Schandorf, Luc Bambara
No abstract text is available yet for this article.
April 2016: Journal of Medical Physics
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