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https://www.readbyqxmd.com/read/28077128/treatment-planning-comparison-of-impt-vmat-and-4%C3%AF-radiotherapy-for-prostate-cases
#1
Angelia Tran, Jingjing Zhang, Kaley Woods, Victoria Yu, Dan Nguyen, Gary Gustafson, Lane Rosen, Ke Sheng
BACKGROUND: Intensity-modulated proton therapy (IMPT), non-coplanar 4π intensity-modulated radiation therapy (IMRT), and volumetric-modulated arc therapy (VMAT) represent the most advanced treatment methods based on heavy ion and X-rays, respectively. Here we compare their performance for prostate cancer treatment. METHODS: Ten prostate patients were planned using IMPT with robustness optimization, VMAT, and 4π to an initial dose of 54 Gy to a clinical target volume (CTV) that encompassed the prostate and seminal vesicles, then a boost prescription dose of 25...
January 11, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28048551/we-fg-brb-02-spatial-mapping-of-the-rbe-of-scanned-particle-beams
#2
D Grosshans
: The physical pattern of energy deposition and the enhanced relative biological effectiveness (RBE) of protons and carbon ions compared to photons offer unique and not fully understood or exploited opportunities to improve the efficacy of radiation therapy. Variations in RBE within a pristine or spread out Bragg peak and between particle types may be exploited to enhance cell killing in target regions without a corresponding increase in damage to normal tissue structures. In addition, the decreased sensitivity of hypoxic tumors to photon-based therapies may be partially overcome through the use of more densely ionizing radiations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048194/we-fg-brb-01-clinical-significance-of-rbe-variations-in-proton-therapy
#3
H Paganetti
: The physical pattern of energy deposition and the enhanced relative biological effectiveness (RBE) of protons and carbon ions compared to photons offer unique and not fully understood or exploited opportunities to improve the efficacy of radiation therapy. Variations in RBE within a pristine or spread out Bragg peak and between particle types may be exploited to enhance cell killing in target regions without a corresponding increase in damage to normal tissue structures. In addition, the decreased sensitivity of hypoxic tumors to photon-based therapies may be partially overcome through the use of more densely ionizing radiations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048070/su-f-t-149-development-of-the-monte-carlo-simulation-platform-using-geant4-for-designing-heavy-ion-therapy-beam-nozzle
#4
Jae-Ik Shin, SeungHoon Yoo, Sungho Cho, Eun Ho Kim, Yongkeun Song, Won-Gyun Jung
PURPOSE: The significant issue of particle therapy such as proton and carbon ion was a accurate dose delivery from beam line to patient. For designing the complex delivery system, Monte Carlo simulation can be used for the simulation of various physical interaction in scatters and filters. In this report, we present the development of Monte Carlo simulation platform to help design the prototype of particle therapy nozzle and performed the Monte Carlo simulation using Geant4. Also we show the prototype design of particle therapy beam nozzle for Korea Heavy Ion Medical Accelerator (KHIMA) project in Korea Institute of Radiological and Medical Science(KIRAMS) at Republic of Korea...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047192/su-c-204-04-irradiation-of-human-cell-lines-using-various-ions
#5
Y Lin, C Tessa, A Rusek, S McMahon, T Kaminuma, K Held
PURPOSE: The purpose of this study is to investigate and quantify the biological effects of ion radiation using several human cell lines. We aim to answer the question of whether carbon ion the most ideal ion species for heavy ion radiotherapy. METHODS: The cells were irradiated at different positions along the pristine Bragg peak of several ions with different atomic number. The biological effectiveness was evaluated using the clonogenic cell survival assay. Irradiation of three human lung cancer cell lines and a fibroblast cell line were undertaken using the charged particle beam at the NASA Space Radiation Laboratory at Brookhaven National Lab...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047170/su-f-t-376-the-efficiency-of-calculating-photonuclear-reaction-on-high-energy-photon-therapy-by-monte-carlo-method
#6
S Hirayama, T Fujibuchi
PURPOSE: Secondary-neutrons having harmful influences to a human body are generated by photonuclear reaction on high-energy photon therapy. Their characteristics are not known in detail since the calculation to evaluate them takes very long time. PHITS(Particle and Heavy Ion Transport code System) Monte Carlo code since versions 2.80 has the new parameter "pnimul" raising the probability of occurring photonuclear reaction forcibly to make the efficiency of calculation. We investigated the optimum value of "pnimul" on high-energy photon therapy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047053/we-h-bra-06-experimental-investigation-of-rbe-for-lung-cancer-cell-lines-as-a-function-of-dose-and-let-in-proton-helium-and-carbon-beams
#7
D Patel, L Bronk, F Guan, C Peeler, D Mirkovic, D Grosshans, O Jakel, A Abdollahi, U Titt, R Mohan
PURPOSE: Investigate and quantify the effect of dose and LET on the RBE of protons, helium and carbon ions. METHODS: High throughput, high accuracy experimental setups were custom designed to investigate the Relative Biological Effectiveness (RBE) dependence on the dose and Linear Energy Transfer (LET) values for proton, helium and carbon ion beams. The experiment was conducted at the HIT facility in collaboration with the DKFZ in Heidelberg/Germany. Clonogenic assays of two human lung cancer cell lines, H460 and H1437, were investigated in this study...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046959/we-fg-brb-03-challenges-and-opportunities-for-implementing-biological-optimization-in-particle-therapy
#8
D Carlson
: The physical pattern of energy deposition and the enhanced relative biological effectiveness (RBE) of protons and carbon ions compared to photons offer unique and not fully understood or exploited opportunities to improve the efficacy of radiation therapy. Variations in RBE within a pristine or spread out Bragg peak and between particle types may be exploited to enhance cell killing in target regions without a corresponding increase in damage to normal tissue structures. In addition, the decreased sensitivity of hypoxic tumors to photon-based therapies may be partially overcome through the use of more densely ionizing radiations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046841/su-g-bra-01-a-real-time-tumor-localization-and-guidance-platform-for-radiotherapy-using-us-and-mri
#9
B Bednarz, W Culberson, M Bassetti, A McMillan, C Matrosic, A Shepard, J Zagzebski, S Smith, W Lee, D Mills, K Cao, B Wang, E Fiveland, R Darrow, T Foo
PURPOSE: To develop and validate a real-time motion management platform for radiotherapy that directly tracks tumor motion using ultrasound and MRI. This will be a cost-effective and non-invasive real-time platform combining the excellent temporal resolution of ultrasound with the excellent soft-tissue contrast of MRI. METHODS: A 4D planar ultrasound acquisition during the treatment that is coupled to a pre-treatment calibration training image set consisting of a simultaneous 4D ultrasound and 4D MRI acquisition...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046645/su-f-t-125-radial-dose-distributions-from-carbon-ions-of-therapeutic-energies-calculated-with-geant4-dna
#10
O Vassiliev
PURPOSE: Radial dose distribution D(r) is the dose as a function of lateral distance from the path of a heavy charged particle. Its main application is in modelling of biological effects of heavy ions, including applications to hadron therapy. It is the main physical parameter of a broad group of radiobiological models known as the amorphous track models. Our purpose was to calculate D(r) with Monte Carlo for carbon ions of therapeutic energies, find a simple formula for D(r) and fit it to the Monte Carlo data...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046508/we-fg-brb-00-the-challenges-of-predicting-rbe-effects-in-particle-therapy-and-opportunities-for-improving-cancer-therapy
#11
David Carlson
: The physical pattern of energy deposition and the enhanced relative biological effectiveness (RBE) of protons and carbon ions compared to photons offer unique and not fully understood or exploited opportunities to improve the efficacy of radiation therapy. Variations in RBE within a pristine or spread out Bragg peak and between particle types may be exploited to enhance cell killing in target regions without a corresponding increase in damage to normal tissue structures. In addition, the decreased sensitivity of hypoxic tumors to photon-based therapies may be partially overcome through the use of more densely ionizing radiations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046397/we-h-bra-07-mechanistic-modelling-of-the-relative-biological-effectiveness-of-heavy-charged-particles
#12
S McMahon, A McNamara, J Schuemann, K Prise, H Paganetti
Purpose Uncertainty in the Relative Biological Effectiveness (RBE) of heavy charged particles compared to photons remains one of the major uncertainties in particle therapy. As RBEs depend strongly on clinical variables such as tissue type, dose, and radiation quality, more accurate individualised models are needed to fully optimise treatments. MethodsWe have developed a model of DNA damage and repair following X-ray irradiation in a number of settings, incorporating mechanistic descriptions of DNA repair pathways, geometric effects on DNA repair, cell cycle effects and cell death...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046319/we-h-bra-09-application-of-a-modified-microdosimetric-kinetic-model-to-analyze-relative-biological-effectiveness-of-ions-relevant-to-light-ion-therapy-using-the-particle-heavy-ion-transport-system
#13
M Butkus, T Palmer
PURPOSE: To evaluate the dose and biological effectiveness of various ions that could potentially be used for actively scanned particle therapy. METHODS: The PHITS Monte Carlo code paired with a microscopic analytical function was used to determine probability distribution functions of the lineal energy in 0.3µm diameter spheres throughout a water phantom. Twenty million primary particles for 1H beams and ten million particles for 4He, 7Li, 10B, 12C, 14N, 16O, and 20Ne were simulated for 0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046299/we-fg-brb-04-rbes-for-human-lung-cancer-cells-exposed-to-protons-and-heavier-ions-implications-for-clinical-use-of-charged-particles-in-cancer-therapy
#14
K Held
: The physical pattern of energy deposition and the enhanced relative biological effectiveness (RBE) of protons and carbon ions compared to photons offer unique and not fully understood or exploited opportunities to improve the efficacy of radiation therapy. Variations in RBE within a pristine or spread out Bragg peak and between particle types may be exploited to enhance cell killing in target regions without a corresponding increase in damage to normal tissue structures. In addition, the decreased sensitivity of hypoxic tumors to photon-based therapies may be partially overcome through the use of more densely ionizing radiations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28007028/phase-i-ii-trial-evaluating-concurrent-carbon-ion-radiotherapy-plus-chemotherapy-for-salvage-treatment-of-locally-recurrent-nasopharyngeal-carcinoma
#15
Lin Kong, Jing Gao, Jiyi Hu, Weixu Hu, Xiyin Guan, Rong Lu, Jiade J Lu
BACKGROUND: After definitive chemoradiotherapy for non-metastatic nasopharyngeal carcinoma (NPC), more than 10% of patients will experience a local recurrence. Salvage treatments present significant challenges for locally recurrent NPC. Surgery, stereotactic ablative body radiotherapy, and brachytherapy have been used to treat locally recurrent NPC. However, only patients with small-volume tumors can benefit from these treatments. Re-irradiation with X-ray-based intensity-modulated radiotherapy (IMXT) has been more widely used for salvage treatment of locally recurrent NPC with a large tumor burden, but over-irradiation to the surrounding normal tissues has been shown to cause frequent and severe toxicities...
December 22, 2016: Chinese Journal of Cancer
https://www.readbyqxmd.com/read/27996023/feasibility-study-on-cardiac-arrhythmia-ablation-using-high-energy-heavy-ion-beams
#16
H Immo Lehmann, Christian Graeff, Palma Simoniello, Anna Constantinescu, Mitsuru Takami, Patrick Lugenbiel, Daniel Richter, Anna Eichhorn, Matthias Prall, Robert Kaderka, Fine Fiedler, Stephan Helmbrecht, Claudia Fournier, Nadine Erbeldinger, Ann-Kathrin Rahm, Rasmus Rivinius, Dierk Thomas, Hugo A Katus, Susan B Johnson, Kay D Parker, Jürgen Debus, Samuel J Asirvatham, Christoph Bert, Marco Durante, Douglas L Packer
High-energy ion beams are successfully used in cancer therapy and precisely deliver high doses of ionizing radiation to small deep-seated target volumes. A similar noninvasive treatment modality for cardiac arrhythmias was tested here. This study used high-energy carbon ions for ablation of cardiac tissue in pigs. Doses of 25, 40, and 55 Gy were applied in forced-breath-hold to the atrioventricular junction, left atrial pulmonary vein junction, and freewall left ventricle of intact animals. Procedural success was tracked by (1...
December 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27968861/effects-of-induction-taxotere-platinum-and-fluorouracil-tpf-chemotherapy-in-patients-with-stage-iii-and-iva-b-nasopharyngeal-cancer-treated-with-concurrent-chemoradiation-therapy-final-results-of-two-parallel-phase-2-clinical-trials
#17
Lin Kong, Youwang Zhang, Chaosu Hu, Ye Guo, Jiade J Lu
BACKGROUND: Concurrent chemoradiotherapy (CCRT) is the standard treatment for locally advanced nasopharyngeal cancer. The effect of induction chemotherapy plus CCRT in patients with this stage of disease is unclear. We therefore examined the long-term outcomes of the addition of induction chemotherapy (consisting of docetaxel, cisplatin, and fluorouracil [TPF]) to CCRT in patients with stage III and IVA/B nasopharyngeal cancer. METHODS: Between January, 2007, and July, 2011, we synchronously undertook two parallel phase 2 single-arm trials to evaluate the efficacy and toxicity of TPF-based induction chemotherapy...
October 2016: Lancet
https://www.readbyqxmd.com/read/27925861/modeling-heavy-ion-impairment-of-hippocampal-neurogenesis-after-acute-and-fractionated-irradiation
#18
Eliedonna Cacao, Francis A Cucinotta
Radiation-induced impairment of neurogenesis in the hippocampal dentate gyrus is a concern due to its reported association with cognitive detriments after radiotherapy for brain cancers and the possible risks to astronauts chronically exposed to space radiation. Here, we have extended our recent work in a mouse model of impaired neurogenesis after exposure to low-linear energy transfer (LET) radiation to heavy ion irradiation. To our knowledge, this is the first report of a predictive mathematical model of radiation-induced changes to neurogenesis for a variety of radiation types after acute or fractionated irradiation...
December 2016: Radiation Research
https://www.readbyqxmd.com/read/27885084/analysis-of-neutron-production-in-passively-scattered-ion-beam-therapy
#19
Seunguk Heo, Seunghoon Yoo, Yongkeun Song, Eunho Kim, Jaeik Shin, Soorim Han, Wongyun Jung, Sanghee Nam, Rena Lee, Kitae Lee, Sungho Cho
A new treatment facility for heavy ion therapy since 2010 was constructed. In the broad beam, a range shifter, ridge filter and multi leaf collimator (MLC) for the generation of the spread-out Bragg peak is used. In this case, secondary neutrons produced by the interactions of the ion field with beam-modifying devices (e.g. double-scattering system, beam shaping collimators and range compensators) are very important for patient safety. Therefore, these components must be carefully examined in the context of secondary neutron yield and associated secondary cancer risk...
November 24, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27884156/targeted-myocardial-gene-expression-in-failing-hearts-by-rna-sequencing
#20
Kajari Dhar, Alexandra M Moulton, Eric Rome, Fang Qiu, Jeff Kittrell, Eugenia Raichlin, Ronald Zolty, John Y Um, Michael J Moulton, Hesham Basma, Daniel R Anderson, James D Eudy, Brian D Lowes
BACKGROUND: Myocardial recovery with left ventricular assist device (LVAD) therapy is highly variable and difficult to predict. Next generation ribonucleic acid (RNA) sequencing is an innovative, rapid, and quantitative approach to gene expression profiling in small amounts of tissue. Our primary goal was to identify baseline transcriptional profiles in non-ischemic cardiomyopathies that predict myocardial recovery in response to LVAD therapy. We also sought to verify transcriptional differences between failing and non-failing human hearts...
November 25, 2016: Journal of Translational Medicine
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