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PARTICLE BEAM THERAPY

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https://www.readbyqxmd.com/read/27885084/analysis-of-neutron-production-in-passively-scattered-ion-beam-therapy
#1
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/27880740/beam-angle-selection-incorporation-of-anatomical-heterogeneities-for-pencil-beam-scanning-charged-particle-therapy
#2
Chie Toramatsu, Taku Inaniwa
In charged particle therapy with pencil beam scanning (PBS), localization of the dose in the Bragg peak makes dose distributions sensitive to lateral tissue heterogeneities. The sensitivity of a PBS plan to lateral tissue heterogeneities can be reduced by selecting appropriate beam angles. The purpose of this study is to develop a fast and accurate method of beam angle selection for PBS. The lateral tissue heterogeneity surrounding the path of the pencil beams at a given angle was quantified with the heterogeneity number representing the variation of the Bragg peak depth across the cross section of the beams using the stopping power ratio of body tissues with respect to water...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27875901/reducing-radiation-related-morbidity-in-the-treatment-of-nasopharyngeal-carcinoma
#3
Jason W Chan, Upendra Parvathaneni, Sue S Yom
While radiation therapy is the mainstay of treatment for nasopharyngeal carcinoma, the anatomic location of the nasopharynx in close proximity to radiation-sensitive organs such as the salivary glands, optic nerves and chiasm, cochlea, brainstem and temporal lobes presents a special challenge. Technological approaches to reducing the morbidity of nasopharyngeal cancer irradiation have been historically successful with the evolution from 2D techniques to increasingly conformal forms of radiation therapy. This report reviews normal tissue dose constraints and major considerations in target delineation for patients with nasopharyngeal cancer in the intensity-modulated radiation therapy era...
November 23, 2016: Future Oncology
https://www.readbyqxmd.com/read/27818559/operation-of-the-preclinical-head-scanner-for-proton-ct
#4
H F-W Sadrozinski, T Geoghegan, E Harvey, R P Johnson, T E Plautz, A Zatserklyaniy, V Bashkirov, R F Hurley, P Piersimoni, R W Schulte, P Karbasi, K E Schubert, B Schultze, V Giacometti
We report on the operation and performance tests of a preclinical head scanner developed for proton computed tomography (pCT). After extensive preclinical testing, pCT is intended to be employed in support of proton therapy treatment planning and pre-treatment verification in patients undergoing particle-beam therapy. In order to assess the performance of the scanner, we have performed CT scans with 200 MeV protons from both the synchrotron of the Loma Linda University Medical Center (LLUMC) and the cyclotron of the Northwestern Medicine Chicago Proton Center (NMCPC)...
September 21, 2016: Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
https://www.readbyqxmd.com/read/27806590/a-scintillator-based-approach-to-monitor-secondary-neutron-production-during-proton-therapy
#5
S D Clarke, E Pryser, B M Wieger, S A Pozzi, R A Haelg, V A Bashkirov, R W Schulte
PURPOSE: The primary objective of this work is to measure the secondary neutron field produced by an uncollimated proton pencil beam impinging on different tissue-equivalent phantom materials using organic scintillation detectors. Additionally, the Monte Carlo code mcnpx-PoliMi was used to simulate the detector response for comparison to the measured data. Comparison of the measured and simulated data will validate this approach for monitoring secondary neutron dose during proton therapy...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27782720/a-general-algorithm-for-calculation-of-recombination-losses-in-ionization-chambers-exposed-to-ion-beams
#6
Jeppe Brage Christensen, Heikki Tölli, Niels Bassler
PURPOSE: Dosimetry with ionization chambers in clinical ion beams for radiation therapy requires correction for recombination effects. However, common radiation protocols discriminate between initial and general recombination and provide no universal correction method for the presence of both recombination types in ion beams of charged particles heavier than protons. The advent of multiple field optimization in ion beams, allowing for complex patterns of dose delivery in both temporal and spatial domains, results in new challenges for recombination correction where the resulting recombination depends on the plan delivered...
October 2016: Medical Physics
https://www.readbyqxmd.com/read/27742257/production-of-the-pet-isotope-11-c-in-hadron-therapy-via-neutron-knockout
#7
E C Simpson
PURPOSE: Positron emitting isotopes such as (11)C and (10)C can be used for vital dose verification in hadron therapy. These isotopes are produced when the high energy (12)C primary beam particles undergo nuclear reactions within the patient. METHODS: We discuss a model for calculating cross sections for the production (11)C in (12)C+(12)C collisions, applicable at hadron therapy energies. RESULTS: Good agreement with the available cross section measurements is found for (12)C(-1n), though more detailed, systematic measurements would be very valuable...
October 11, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27740939/accelerated-prompt-gamma-estimation-for-clinical-proton-therapy-simulations
#8
Brent F B Huisman, J M Létang, É Testa, D Sarrut
There is interest in the particle therapy community in using prompt gammas (PGs), a natural byproduct of particle treatment, for range verification and eventually dose control. However, PG production is a rare process and therefore estimation of PGs exiting a patient during a proton treatment plan executed by a Monte Carlo (MC) simulation converges slowly. Recently, different approaches to accelerating the estimation of PG yield have been presented. Sterpin et al (2015 Phys. Med. Biol. 60 4915-46) described a fast analytic method, which is still sensitive to heterogeneities...
October 14, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27736917/optimization-of-carbon-ion-treatment-plans-by-integrating-tissue-specific-%C3%AE-%C3%AE-values-for-patients-with-non-resectable-pancreatic-cancer
#9
Constantin Dreher, Christian Scholz, Mira Pommer, Stephan Brons, Hannah Prokesch, Swantje Ecker, Jürgen Debus, Oliver Jäkel, Stephanie E Combs, Daniel Habermehl
BACKGROUND: The aim of the thesis is to improve treatment plans of carbon ion irradiation by integrating the tissues' specific [Formula: see text]-values for patients with locally advanced pancreatic cancer (LAPC). MATERIAL AND METHODS: Five patients with LAPC were included in this study. By the use of the treatment planning system Syngo RT Planning (Siemens, Erlangen, Germany) treatment plans with carbon ion beams have been created. Dose calculation was based on [Formula: see text]-values for both organs at risk (OAR) and the tumor...
2016: PloS One
https://www.readbyqxmd.com/read/27720205/a-novel-conformal-superficial-high-dose-rate-brachytherapy-device-for-the-treatment-of-nonmelanoma-skin-cancer-and-keloids
#10
Clara Ferreira, Daniel Johnson, Karl Rasmussen, Clinton Leinweber, Salahuddin Ahmad, Jae Won Jung
PURPOSE: To develop a novel conformal superficial brachytherapy (CSBT) device as a treatment option for the patient-specific radiation therapy of conditions including superficial lesions, postsurgical positive margins, Dupuytren's contractures, keloid scars, and complex anatomic sites (eyelids, nose, ears, etc.). METHODS AND MATERIALS: A preliminary CSBT device prototype was designed, built, and tested using readily available radioactive seeds. Iodine-125 ((125)I) seeds were independently guided to the treatment surface to conform to the target...
October 3, 2016: Brachytherapy
https://www.readbyqxmd.com/read/27694712/recent-developments-and-comprehensive-evaluations-of-a-gpu-based-monte-carlo-package-for-proton-therapy
#11
Nan Qin, Pablo Botas, Drosoula Giantsoudi, Jan Schuemann, Zhen Tian, Steve B Jiang, Harald Paganetti, Xun Jia
Monte Carlo (MC) simulation is commonly considered as the most accurate dose calculation method for proton therapy. Aiming at achieving fast MC dose calculations for clinical applications, we have previously developed a graphics-processing unit (GPU)-based MC tool, gPMC. In this paper, we report our recent updates on gPMC in terms of its accuracy, portability, and functionality, as well as comprehensive tests on this tool. The new version, gPMC v2.0, was developed under the OpenCL environment to enable portability across different computational platforms...
October 3, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27688469/optical-imaging-of-ionizing-radiation-from-clinical-sources
#12
Travis M Shaffer, Charles Michael Drain, Jan Grimm
Nuclear medicine uses ionizing radiation for both in vivo diagnosis and therapy. Ionizing radiation comes from a variety of sources, including x-rays, beam therapy, brachytherapy, and various injected radionuclides. Although PET and SPECT remain clinical mainstays, optical readouts of ionizing radiation offer numerous benefits and complement these standard techniques. Furthermore, for ionizing radiation sources that cannot be imaged using these standard techniques, optical imaging offers a unique imaging alternative...
November 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27667884/a-new-silicon-tracker-for-proton-imaging-and-dosimetry
#13
J T Taylor, C Waltham, T Price, N M Allinson, P P Allport, G L Casse, A Kacperek, S Manger, N A Smith, I Tsurin
For many years, silicon micro-strip detectors have been successfully used as tracking detectors for particle and nuclear physics experiments. A new application of this technology is to the field of particle therapy where radiotherapy is carried out by use of charged particles such as protons or carbon ions. Such a treatment has been shown to have advantages over standard x-ray radiotherapy and as a result of this, many new centres offering particle therapy are currently under construction around the world today...
September 21, 2016: Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
https://www.readbyqxmd.com/read/27662784/mechanisms-of-phosphene-generation-in-ocular-proton-therapy-as-related-to-space-radiation-exposure
#14
D Chuard, V Anthonipillai, R Dendale, C Nauraye, E Khan, C Mabit, L De Marzi, L Narici
Particle therapy provides an opportunity to study the human response to space radiation in ground-based facilities. On this basis, a study of light flashes analogous to astronauts' phosphenes reported by patients undergoing ocular proton therapy has been undertaken. The influence of treatment parameters on phosphene generation was investigated for 430 patients treated for a choroidal melanoma at the proton therapy centre of the Institut Curie (ICPO) in Orsay, France, between 2008 and 2011. 60% of them report light flashes, which are predominantly (74%) blue...
August 2016: Life Sciences in Space Research
https://www.readbyqxmd.com/read/27659007/review-of-geant4-dna-applications-for-micro-and-nanoscale-simulations
#15
S Incerti, M Douglass, S Penfold, S Guatelli, E Bezak
Emerging radiotherapy treatments including targeted particle therapy, hadron therapy or radiosensitisation of cells by high-Z nanoparticles demand the theoretical determination of radiation track structure at the nanoscale. This is essential in order to evaluate radiation damage at the cellular and DNA level. Since 2007, Geant4 offers physics models to describe particle interactions in liquid water at the nanometre level through the Geant4-DNA Package. This package currently provides a complete set of models describing the event-by-event electromagnetic interactions of particles with liquid water, as well as developments for the modelling of water radiolysis...
September 19, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27563457/clinical-outcomes-and-toxicities-of-proton-radiotherapy-for-gastrointestinal-neoplasms-a-systematic-review
#16
Vivek Verma, Steven H Lin, Charles B Simone, Minesh P Mehta
BACKGROUND: Proton beam radiotherapy (PBT) is frequently shown to be dosimetrically superior to photon radiotherapy (RT), though supporting data for clinical benefit are severely limited. Because of the potential for toxicity reduction in gastrointestinal (GI) malignancies, we systematically reviewed the literature on clinical outcomes (survival/toxicity) of PBT. METHODS: A systematic search of PubMed, EMBASE, abstracts from meetings of the American Society for Radiation Oncology, Particle Therapy Co-Operative Group, and American Society of Clinical Oncology was conducted for publications from 2000-2015...
August 2016: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/27540827/nuclear-physics-in-particle-therapy-a-review
#17
Marco Durante, Harald Paganetti
Charged particle therapy has been largely driven and influenced by nuclear physics. The increase in energy deposition density along the ion path in the body allows reducing the dose to normal tissues during radiotherapy compared to photons. Clinical results of particle therapy support the physical rationale for this treatment, but the method remains controversial because of the high cost and of the lack of comparative clinical trials proving the benefit compared to x-rays. Research in applied nuclear physics, including nuclear interactions, dosimetry, image guidance, range verification, novel accelerators and beam delivery technologies, can significantly improve the clinical outcome in particle therapy...
September 2016: Reports on Progress in Physics
https://www.readbyqxmd.com/read/27536555/monitoring-of-hadrontherapy-treatments-by-means-of-charged-particle-detection
#18
REVIEW
Silvia Muraro, Giuseppe Battistoni, Francesco Collamati, Erika De Lucia, Riccardo Faccini, Fernando Ferroni, Salvatore Fiore, Paola Frallicciardi, Michela Marafini, Ilaria Mattei, Silvio Morganti, Riccardo Paramatti, Luca Piersanti, Davide Pinci, Antoni Rucinski, Andrea Russomando, Alessio Sarti, Adalberto Sciubba, Elena Solfaroli-Camillocci, Marco Toppi, Giacomo Traini, Cecilia Voena, Vincenzo Patera
The interaction of the incoming beam radiation with the patient body in hadrontherapy treatments produces secondary charged and neutral particles, whose detection can be used for monitoring purposes and to perform an on-line check of beam particle range. In the context of ion-therapy with active scanning, charged particles are potentially attractive since they can be easily tracked with a high efficiency, in presence of a relatively low background contamination. In order to verify the possibility of exploiting this approach for in-beam monitoring in ion-therapy, and to guide the design of specific detectors, both simulations and experimental tests are being performed with ion beams impinging on simple homogeneous tissue-like targets (PMMA)...
2016: Frontiers in Oncology
https://www.readbyqxmd.com/read/27511858/time-lapse-monitoring-of-dna-damage-colocalized-with-particle-tracks-in-single-living%C3%A2-cells
#19
Conor H McFadden, Timothy M Hallacy, David B Flint, Dal A Granville, Aroumougame Asaithamby, Narayan Sahoo, Mark S Akselrod, Gabriel O Sawakuchi
PURPOSE: Understanding the DNA damage and repair induced by hadron therapy (HT) beams is crucial for developing novel strategies to maximize the use of HT beams to treat cancer patients. However, spatiotemporal studies of DNA damage and repair for beam energies relevant to HT have been challenging. We report a technique that enables spatiotemporal measurement of radiation-induced damage in live cells and colocalization of this damage with charged particle tracks over a broad range of clinically relevant beam energies...
September 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27500710/proton-radiotherapy-for-gynecologic-neoplasms
#20
Vivek Verma, Charles B Simone, Andrew O Wahl, Sushil Beriwal, Minesh P Mehta
BACKGROUND: Proton beam therapy (PBT) is increasingly being used globally to treat a variety of malignancies. This is the first review assessing PBT for gynecologic neoplasms. Dose distribution to organs-at-risk (OARs), particularly bone marrow (BM), is addressed. Clinical outcomes and toxicity data are detailed. MATERIAL AND METHODS: Systematic searches of PubMed, EMBASE, abstracts from meetings of the American Society for Radiation Oncology, Particle Therapy Co-Operative Group, and American Society of Clinical Oncology were conducted for publications...
November 2016: Acta Oncologica
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