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https://www.readbyqxmd.com/read/28203163/is-the-deep-inspiration-breath-hold-technique-superior-to-the-free-breathing-technique-in-cardiac-and-lung-sparing-while-treating-both-left-sided-post-mastectomy-chest-wall-and-supraclavicular-regions
#1
Anupama Darapu, Rajesh Balakrishnan, Patricia Sebastian, Mohamathu Rafic Kather Hussain, Paul Ravindran, Subhashini John
AIMS: To evaluate the efficacy of the deep inspirational breath-hold (DIBH) technique and its dosimetric advantages over the free breathing (FB) technique in cardiac (heart and left anterior descending artery [LAD]) and ipsilateral lung sparing in left-sided post-mastectomy field-in-field conformal radiotherapy. DIBH is highly reproducible, and this study aims to find out its dosimetric benefits over FB. MATERIALS AND METHODS: Nineteen left-sided mastectomy patients were immobilized using breast boards with both arms positioned above the head...
January 2017: Case Reports in Oncology
https://www.readbyqxmd.com/read/28191342/dose-response-curves-of-the-fdxr-and-rad51-genes-with-6-and-18-mv-beam-energies-in-human-peripheral-blood-lymphocytes
#2
Alihossein Saberi, Ehsan Khodamoradi, Mohammad Javad Tahmasebi Birgani, Manoochehr Makvandi, Bijan Noori
BACKGROUND: Rapid dose assessment using biological dosimetry methods is essential to increase the chance of survival of exposed individuals in radiation accidents. OBJECTIVES: We compared the expression levels of the FDXR and RAD51 genes at 6 and 18 MV beam energies in human peripheral blood lymphocytes. The results of our study can be used to analyze radiation energy in biological dosimetry. METHODS: For this in vitro experimental study, from 36 students in the medical physics and virology departments, seven voluntary, healthy, non-smoking male blood donors of Khuzestan ethnicity with no history of exposure to ionization radiation were selected using simple randomized sampling...
November 2016: Iranian Red Crescent Medical Journal
https://www.readbyqxmd.com/read/28176287/metal-ions-removal-using-nano-oxide-pyrolox%C3%A2-material
#3
A Gładysz-Płaska, E Skwarek, T M Budnyak, D Kołodyńska
The paper presents the use of Pyrolox™ containing manganese nano oxides used for the removal of Cu(II), Zn(II), Cd(II), and Pb(II) as well as U(VI) ions. Their concentrations were analyzed using the atomic absorption spectrometer SpectrAA 240 FS (Varian) as well as UV-vis method. For this purpose the static kinetic and equilibrium studies were carried out using the batch technique. The effect of solution pH, shaking time, initial metal ion concentrations, sorbent dosage, and temperature was investigated. The equilibrium data were analyzed using the sorption isotherm models proposed by Freundlich, Langmuir-Freundlich, Temkin, and Dubinin-Radushkevich...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28152839/development-of-a-radiation-oncology-specific-prospective-data-registry-for-clinical-research-and-quality-improvement-a-clinical-workflow-based-solution
#4
Pin-Chieh Wang, Darlene Verittupong, Weber Shao, Susan Ann McCloskey, Vincent Basehart, Michael L Steinberg, Patrick Kupelian
: 197 Background: The computerized 'paperless' medical recording system has transformed the modern health information system and serves as an idea platform for cancer registry development, particularly in a specialty like radiation oncology, where technological advances generate unprecedented amounts of data. METHODS: From May 2011 to May 2015, physicians prospectively inputted data on patients seen during consultation in the Department of Radiation Oncology at UCLA...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28152195/a-2d-silicon-detector-array-for-quality-assurance-in-small-field-dosimetry-duo
#5
Khalsa Al Shukaili, Marco Petasecca, Matthew Newall, Anthony Espinoza, Vladimir L Perevertaylo, Stéphanie Corde, Michael Lerch, Anatoly B Rosenfeld
PURPOSE: Nowadays, there are many different applications that use small fields in radiotherapy treatments. The dosimetry of small radiation fields is not trivial due to the problems associated with lateral disequilibrium and source occlusion and requires reliable quality assurance (QA). Ideally such a QA tool should provide high spatial resolution, minimal beam perturbation and real time fast measurements. Many different types of silicon diode arrays are used for QA in radiotherapy; however, their application in small filed dosimetry is limited, in part, due to a lack of spatial resolution...
December 10, 2016: 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
#6
(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/28138176/comparison-amongst-pulse-sequences-for-enhanced-contrast-to-noise-ratio-in-magnetic-resonance-imaging
#7
Naima Amin, Rao Muhammad Afzal, Muhammad Yousaf, Muhammad Arshad Javid
OBJECTIVE: To provide optimised pulse sequence and imaging protocols for contrast-to-noise ratio and for tissues that have different signal intensities in magnetic resonance imaging. METHODS: A tissue equivalent material, ferrous benzoic xylenol orange gel, was prepared using gelatine, ferrous ammonium sulfate, sulfuric acid, xylenol orange tetrasodium salt and benzoic acid. The gel was irradiated using 6MV photons from a Varian Clinac 600C linear accelerator, with a dose of 5, 10, 15, 20 and 25 gray...
February 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28133821/total-skin-electron-therapy-as-treatment-for-epitheliotropic-lymphoma-in-a-dog
#8
Domenico Santoro, Lyndsay Kubicek, Bo Lu, William Craft, Julia Conway
BACKGROUND: Mycosis fungoides (MF) is an uncommon cutaneous neoplasm in dogs. Treatment options are limited. Total skin electron therapy (TSET) has been suggested as a possible therapy for canine MF. OBJECTIVE: To describe the use of TSET as palliative treatment for MF in a dog. RESULTS: An adult dog, previously diagnosed with nonepidermolytic ichthyosis, was presented with generalized erythroderma, alopecia and erosions. Histopathology revealed a densely cellular, well-demarcated, unencapsulated infiltrate extending from the epidermis to the mid-dermis compatible with MF...
January 29, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/28124771/development-and-verification-of-a-time-delivery-model-for-prostate-intensity-modulated-radiotherapy-using-a-siemens-%C3%A2-artiste%C3%A2-160-multi-leaf-collimator-linac
#9
Nicola Fourie, Omer A Ali, William I D Rae
Time delivery models thus far proposed for prediction of radiotherapy delivery times are not applicable to all makes of Linac. Our purpose was to develop a time delivery model, which would also be applicable for a Siemens(®) ARTISTE™ 160 Multi-leaf Collimator (MLC) linear accelerator (Linac) and validate the model using prostate Intensity Modulated Radiation Therapy (IMRT) treatment plans. To our knowledge, a time delivery model has not yet been proposed for a Siemens(®) ARTISTE™ 160 MLC Linac. We used the principles of the time delivery model created for a Varian(®) Linac and added the radio frequency (RF) wave component, and the MLC delay time to the MLC travel time component...
January 26, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28118613/prognostic-value-of-abnormally-expressed-lncrnas-in-ovarian-carcinoma-a-systematic-review-and-meta-analysis
#10
REVIEW
Ping Luo, Xue-Fang Liu, Ying-Chao Wang, Nan-Di Li, Shen-Jun Liao, Ming-Xia Yu, Chun-Zi Liang, Jian-Cheng Tu
Ovarian cancer (OC) is the most deadly gynecological cancer and it is urgently needed to find a new marker for the progress of OC. Many long noncoding RNAs (lncRNAs) have been reported to be aberrantly expressed in ovarian carcinoma, and may serve as prognostic markers. Therefore, we conducted this meta-analysis to gain a better understanding of the prognostic value of lncRNAs in patients with varian carcinoma. We systematically searched PubMed, EMBASE, and Web of Science. A total of 13 eligible studies, including 10 on clinicopathological features, 13 on prognosis were identified...
January 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28102954/dosimetric-impact-of-lipiodol-in-stereotactic-body-radiation-therapy-on-liver-after-trans-arterial-chemoembolization
#11
Daisuke Kawahara, Shuichi Ozawa, Akito Saito, Teiji Nishio, Tomoki Kimura, Tatsuhiko Suzuki, Kazunari Hioki, Takeo Nakashima, Yoshimi Ohno, Yuji Murakami, Yasushi Nagata
PURPOSE: Stereotactic body radiation therapy (SBRT) combining trans-arterial chemoembolization (TACE) with Lipiodol is expected to improve local control. This study is aimed to estimate the dose enhancement in Lipiodol's proximity and to evaluate the dose calculation accuracy of the Acuros XB (AXB) algorithm and anisotropic analytical algorithm (AAA) in the Eclipse treatment planning system (TPS) (ver. 11, Varian Medical Systems, Palo Alto, USA), compared with that of the Monte Carlo (MC) calculation (using BEAMnrc/DOSXYZnrc code) for a virtual phantom and a treatment plan for liver SBRT after TACE...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102946/a-portal-dosimetry-dose-prediction-method-based-on-collapsed-cone-algorithm-using-the-clinical-beam-model
#12
J Martínez Ortega, N Gómez González, P Castro Tejero, M Pinto Monedero, N B Tolani, L Núñez Martín, R Sánchez Montero
PURPOSE: Amorphous silicon electronical portal imaging devices (EPIDs) are widely used for dosimetric measurements in Radiation Therapy. The purpose of this work was to determine if a portal dose prediction method can be utilized for dose map calculations based on the linear accelerator model within a commercial treatment planning system (Pinnacle(3) v8.0 m). METHODS: The method was developed for a 6 MV photon beam on the Varian Clinac 21-EX, at a nominal dose rate of 400 MU/min...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102944/a-simple-and-robust-trajectory-based-stereotactic-radiosurgery-treatment
#13
Byron Wilson, Karl Otto, Ermias Gete
INTRODUCTION: We present a Trajectory-based Volumetric Modulated Arc Therapy (TVMAT) technique for Stereotactic Radiosurgery (SRS) that takes advantage of a modern linacs ability to modulate dose rate and move the couch dynamically. In addition, we investigate the quality of the developed TVMAT method and the dosimetric accuracy of the technique. METHODS: The main feature of the TVMAT technique is a standard beam trajectory formed by dynamic motion of the treatment couch and the linac gantry...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102479/peripherally-inserted-central-catheter-related-bloodstream-infection-caused-by-kocuria-marina-in-an-elderly-man
#14
Nobuaki Mori, Yuichi Nishihara, Hideki Tayama, Akiko Higuchi, Yasuko Aoki
BACKGROUND: Kocuria species are Gram-positive, aerobic cocci, and members of the Micrcoccaceae family that are known to be opportunistic pathogens. Although there have been sporadic reports of infections caused by Kocuria species, little is known regarding their human pathogenicity and clinical characteristics. CASE REPORT: We herein report a case of a peripherally inserted central catheter (PICC)-related bloodstream infection caused by Kocuria marina in a 90-year-old Japanese with multiple cancer...
January 19, 2017: Infection
https://www.readbyqxmd.com/read/28094209/simplified-low-dose-rate-infant-total-body-irradiation
#15
Nels Knutson, Y James Rao, Sridhar Yaddanapudi, Stephanie M Perkins, H Harold Li
PURPOSE: Low-dose-rate total body irradiation (LDR TBI) in infants possesses unique challenges because of the setup limitations imposed by anesthesia. We present an LDR TBI method with an anteroposterior/posteroanterior arrangement and dose rate < 10 cGy/minute for infants (thickness <14 cm) without the use of a beam attenuator. MATERIALS AND METHODS: The delivery used a 6 MV TrueBeam linear accelerator (Varian Medical Systems, Palo Alto, CA) with adjustable meterset rates below 100 MU/minute...
October 24, 2016: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28070864/factors-that-affect-the-content-of-cadmium-nickel-copper-and-zinc-in-tissues-of-the-knee-joint
#16
Wojciech Roczniak, Barbara Brodziak-Dopierała, Elżbieta Cipora, Agata Jakóbik-Kolon, Joanna Kluczka, Magdalena Babuśka-Roczniak
Osteoarthritis causes the degradation of the articular cartilage and periarticular bones. Trace elements influence the growth, development and condition of the bone tissue. Changes to the mineral composition of the bone tissue can cause degenerative changes and fractures. The aim of the research was to determine the content of cadmium (Cd), nickel (Ni), copper (Cu) and zinc (Zn) in the tibia, the femur and the meniscus in men and women who underwent a knee replacement surgery. Samples were collected from 50 patients, including 36 women and 14 men...
January 9, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28060314/analysis-of-simian-immunodeficiency-virus-specific-cd8-t-cells-in-rhesus-macaques-by-peptide-mhc-i-tetramer-staining
#17
Lucas Gonzalez-Nieto, Aline Domingues, Michael Ricciardi, Martin J Gutman, Helen S Maxwell, Nuria Pedreño-Lopez, Varian Bailey, Diogo M Magnani, Mauricio A Martins
Peptide-major histocompatibility complex class I (pMHC-I) tetramers have been an invaluable tool to study CD8(+) T-cell responses. Because these reagents directly bind to T-cell receptors on the surface of CD8(+) T-lymphocytes, fluorochrome-labeled pMHC-I tetramers enable the accurate detection of antigen (Ag)-specific CD8(+) T-cells without the need for in vitro re-stimulation. Moreover, when combined with multi-color flow cytometry, pMHC-I tetramer staining can reveal key aspects of Ag-specific CD8(+) T-cells, including differentiation stage, memory phenotype, and activation status...
December 23, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28048921/su-f-j-127-multi-institutional-evaluation-of-setup-organ-deformation-precision-dosimetry-in-total-marrow-irradiation
#18
D Zuro, S Hui
PURPOSE: Totals Marrow Irradiation (TMI) is a highly focused radiation delivery to the human skeleton structure therefore requiring a high amount of precision and accuracy for a quality treatment. Not much is known on how the patient position varies across multiple treatment fractions and how that positioning impacts the dose delivery. Currently TMI is studied as an international collaboration with multiple centers around the world; however, many of these centers used different pretreatment techniques...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048909/su-f-p-36-automation-of-linear-accelerator-star-shot-measurement-with-advanced-xml-scripting-and-electronic-portal-imaging-device
#19
N Nguyen, N Knutson, M Schmidt, M Price
PURPOSE: To verify a method used to automatically acquire jaw, MLC, collimator and couch star shots for a Varian TrueBeam linear accelerator utilizing Developer Mode and an Electronic Portal Imaging Device (EPID). METHODS: An XML script was written to automate motion of the jaws, MLC, collimator and couch in TrueBeam Developer Mode (TBDM) to acquire star shot measurements. The XML script also dictates MV imaging parameters to facilitate automatic acquisition and recording of integrated EPID images...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048903/su-f-e-17-a-dedicated-teaching-and-research-linac-as-a-stepping-stone-to-introduce-medical-physics-to-students
#20
L Beaulieu, L Gingras, M Bergeron, L Archambault
PURPOSE: This work describes how a non-clinical, research and teaching Linac is used as an extremely motivating and exciting way to introduce students to medical physics. METHODS: The dedicated facility was inaugurated in 2014. The facility is composed of a fully equipped and functional state-of-the-art Varian TrueBeam Linac and a complete set of physics instruments and QA phantoms for the Linac and onboard imaging. The Linac bunker and treatment console are oversized such that a class of 12-15 can comfortably fit, seated if needed for longer sessions...
June 2016: Medical Physics
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