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PARTICLE BEAM THERAPY

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https://www.readbyqxmd.com/read/28945054/intracranial-stereotactic-radiosurgery
#1
Andrew A Fanous, Dheerendra Prasad, David Mathieu, Andrew J Fabiano
Stereotactic radiosurgery (SRS) is the use of a single high dose of radiation, stereotactically directed to an intracranial region of interest, in order to create a lesion or obliterate a preexisting one. This technology has evolved over the years into the use of multiple radiation sources oriented at a variety of angles, thus permitting the creation of various treatment target shapes. This allows for non-open surgical treatment of intracranial pathologies, which significantly decreases the risk of morbidity...
September 22, 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28924096/revision-of-calibration-method-of-ct-number-to-stopping-power-ratio-conversion-for-treatment-planning-of-particle-therapy
#2
Nobuyuki Kanematsu, Shinichiro Mori, Taku Inaniwa
A calibration method for CT-number to stopping-power-ratio conversion was recently proposed as a revision of the Japanese de facto standard method that has been used at particle therapy centers in Japan for over a decade. The revised method deals with 11 representative tissues of specific elemental composition and density, based on a latest compilation of standard tissue data. We report here how the revision was actually implemented into clinical practice. We applied the revised method to 7 CT-scanning conditions currently in use for treatment planning...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28895552/measurement-of-track-structure-parameters-of-low-and-medium-energy-helium-and-carbon-ions-in-nanometric-volumes
#3
G Hilgers, M U Bug, H Rabus
Ionization cluster size distributions produced in the sensitive volume of an ion-counting wall-less nanodosimeter by monoenergetic carbon ions with energies between 45 MeV and 150 MeV were measured at the TANDEM-ALPI ion accelerator facility complex of the LNL-INFN in Legnaro. Those produced by monoenergetic helium ions with energies between 2 MeV and 20 MeV were measured at the accelerator facilities of PTB and with a (241)Am alpha particle source. C3H8 was used as the target gas. The ionization cluster size distributions were measured in narrow beam geometry with the primary beam passing the target volume at specified distances from its centre, and in broad beam geometry with a fan-like primary beam...
September 12, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28886211/homogeneity-study-of-proton-and-carbon-ion-scanning-beams-using-combinations-of-different-spot-sizes-and-grid-sizes
#4
Ying Xing, Xianwei Wu, Yongqiang Li, Jun Zhao
PURPOSE: Different scanning ion beam delivery systems have different delivery accuracies, and the resulting delivery errors will affect field homogeneity. This study was performed to determine an appropriate combination of spot size (FWHM) and spot grid size (GS), which can provide homogenous dose distributions for both proton and carbon ion scanning beam radiotherapy. The combination of the two parameters is represented by a combination factor named n, which is the quotient of FWHM divided by GS...
September 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28885189/addendum-measurement-of-charged-particle-yields-from-pmma-irradiated-by-a-220-mev-u-sup-12-sup-c-beam
#5
Ilaria Mattei, Giuseppe Battistoni, Francesco Collini, Erika De Lucia, Marco Durante, Salvatore Fiore, Chiara Latessa, Carlo Mancini-Terracciano, Michela Marafini, Riccardo Mirabelli, Silvia Muraro, Riccardo Paramatti, Luca Piersanti, Antoni Rucinski, Andrea Russomando, Alessio Sarti, Christoph Schuy, Adalberto Sciubba, Elena Solfaroli Camillocci, Marco Toppi, Giacomo Traini, Serena Marta Valle, Marie Vanstalle, Vincenzo Patera
In this paper we report the re-analysis of the data published in (Piersanti et al. 2014) documenting the charged secondary particles production induced by the interaction of a 220 MeV/u 12C ion beam impinging on a polymethyl methacrylate (PMMA) target, measured in 2012 at the GSI facility in Darmstadt (Germany). This re-analysis takes into account the inhomogeneous light response of the LYSO crystal in the experimental setup measured in a subsequent experiment (2014) performed in the Heidelberg Ion- Beam Therapy Center...
September 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28884707/review-of-medical-radiography-and-tomography-with-proton-beams
#6
Robert P Johnson
The use of hadron beams, especially proton beams, in cancer radiotherapy has expanded rapidly in the past two decades. To fully realize the advantages of hadron therapy over traditional X-ray and gamma-ray therapy requires accurate positioning of the Bragg peak throughout the tumor being treated. Already a half century ago suggestions were made to use protons themselves to develop images of tumors and surrounding tissue, to be used for treatment planning. The recent global expansion of hadron therapy coupled with modern advances in computation and particle detection has led several collaborations around the world to develop prototype detector systems and associated reconstruction codes for proton computed tomography (pCT) as well as more simple proton radiography, with the ultimate intention to use such systems in clinical treatment planning and verification...
September 8, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28880368/optimization-of-monte-carlo-particle-transport-parameters-and-validation-of-a-novel-high-throughput-experimental-setup-to-measure-the-biological-effects-of-particle-beams
#7
Darshana Patel, Lawrence Bronk, Fada Guan, Christopher R Peeler, Stephan Brons, Ivana Dokic, Amir Abdollahi, Claudia Rittmüller, Oliver Jäkel, David Grosshans, Radhe Mohan, Uwe Titt
PURPOSE: Accurate modeling of the relative biological effectiveness (RBE) of particle beams requires increased systematic in vitro studies with human cell lines with care towards minimizing uncertainties in biologic assays as well as physical parameters. In this study we describe a novel high-throughput experimental setup and an optimized parameterization of the Monte Carlo (MC) simulation technique that is universally applicable for accurate determination of RBE of clinical ion beams...
September 7, 2017: Medical Physics
https://www.readbyqxmd.com/read/28873069/fred-a-gpu-accelerated-fast-monte-carlo-code-for-rapid-treatment-plan-recalculation-in-ion-beam-therapy
#8
A Schiavi, M Senzacqua, S Pioli, A Mairani, G Magro, S Molinelli, M Ciocca, G Battistoni, V Patera
Ion beam therapy is a rapidly growing technique for tumor radiation therapy. Ions allow for a high dose deposition in the tumor region, while sparing the surrounding healthy tissue. For this reason, the highest possible accuracy in the calculation of dose and its spatial distribution is required in treatment planning. On one hand, commonly used treatment planning software solutions adopt a simplified beam-body interaction model by remapping pre-calculated dose distributions into a 3D water-equivalent representation of the patient morphology...
September 5, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28871342/a-systematic-review-of-publications-on-charged-particle-therapy-for-hepatocellular-carcinoma
#9
REVIEW
Hiroshi Igaki, Masashi Mizumoto, Toshiyuki Okumura, Kiyoshi Hasegawa, Norihiro Kokudo, Hideyuki Sakurai
Charged particle therapy (proton beam therapy and carbon ion therapy) is a form of radiotherapy which has the unique characteristic of superior depth dose distribution, and has been used for the treatment of hepatocellular carcinoma (HCC) in a limited number of patients, especially in Japan. We undertook a systematic review to define the clinical utility of charged particle therapy for patients with HCC. We searched the MEDLINE database from 1983 to June 2016 to identify clinical studies on charged particle therapy for HCC...
September 4, 2017: International Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28862152/tumor-control-in-ion-beam-radiotherapy-with-different-ions-in-presence-of-hypoxia-an-oxygen-enhancement-ratio-model-based-on-the-microdosimetric-kinetic-model
#10
Lidia Strigari, Francesca Torriani, Lorenzo Manganaro, Taku Inaniwa, Federico Dalmasso, Roberto Cirio, Andrea Attili
Few attempts to include the oxygen enhancement ratio (OER) in treatment planning for ion beam therapy have been made and systematic studies to evaluate the impact of hypoxia in treatments with beam of different ion species are missing. The radiobiological models used to quantify the OER in such studies are mainly based on the dose-averaged LET estimates and do not explicitly distinguish between ion species and fractionation schemes. In this study a new OER modelling, based on the microdosimetric kinetic model, taking into account the specificity of the different ions, LET spectra, tissues and fractionation schemes, has been developed...
September 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28832343/a-new-formalism-for-modelling-parameters-%C3%AE-and-%C3%AE-of-the-linear-quadratic-model-of-cell-survival-for-hadron-therapy
#11
Oleg N Vassiliev, David R Grosshans, Radhe Mohan
We propose a new formalism for calculating parameters α and β of the linear quadratic model of cell survival. This formalism, primarily intended for calculating relative biological effectiveness (RBE) for treatment planning in hadron therapy, is based on a recently proposed microdosimetric revision of the single-target multi-hit model. The main advantage of our formalism is that it reliably produces α and β that have correct general properties with respect to their dependence on physical properties of the beam, including the asymptotic behavior for very low and high linear energy transfer (LET) beams...
August 23, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28826292/radiobiological-issues-in-proton-therapy
#12
Radhe Mohan, Christopher R Peeler, Fada Guan, Lawrence Bronk, Wenhua Cao, David R Grosshans
The relative biological effectiveness (RBE) for particle therapy is a complex function of particle type, radiation dose, linear energy transfer (LET), cell type, endpoint, etc. In the clinical practice of proton therapy, the RBE is assumed to have a fixed value of 1.1. This assumption, along with the effects of physical uncertainties, may mean that the biologically effective dose distributions received by the patient may be significantly different from what is seen on treatment plans. This may contribute to unforeseen toxicities and/or failure to control the disease...
August 22, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28825918/investigation-of-mixed-ion-fields-in-the-forward-direction-for-220-5-mev-u-helium-ion-beams-comparison-between-water-and-pmma-targets
#13
Giulia Arico, Tim Gehrke, Jan Jakubek, Raya Gallas, Simon Berke, Oliver Jaekel, Andrea Mairani, Alfredo Ferrari, Maria Martisikova
Currently there is a rising interest in helium ion beams for radiotherapy. For benchmarking of the physical beam models used in treatment planning, there is a need of experimental data on the composition and spatial distribution of mixed ion fields. Of particular interest are the attenuation of the primary helium ion fluence and the build-up of secondary hydrogen ions due to nuclear interactions. The aim of this work was to provide such data with an enhanced precision. Moreover, the validity and limits of the mixed ion field equivalence were investigated between water and PMMA targets...
August 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28809759/independent-dose-verification-system-with-monte-carlo-simulations-using-topas-for-passive-scattering-proton-therapy-at-the-national-cancer-center-in-korea
#14
Wook-Geun Shin, Mauro Testa, Hak Soo Kim, Jong Hwi Jeong, Se Byeong Lee, Yeon-Joo Kim, Chul Hee Min
For the independent validation of treatment plans, we developed a Monte Carlo (MC)-based patient dose calculation system with the tool for particle simulation (TOPAS) to enable routine and automatic dose recalculation for each patient. The proton beam nozzle was modeled with TOPAS to simulate the therapeutic beam, and MC commissioning was performed by comparing percent depth dose with the measurement. The beam set-up based on the prescribed beam range and modulation width was automated by modifying the vendor-specific method...
August 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28770316/hepatic-arterial-embolization-using-cone-beam-ct-with-tumor-feeding-vessel-detection-software-impact-on-hepatocellular-carcinoma-response
#15
F H Cornelis, A Borgheresi, E N Petre, E Santos, S B Solomon, K Brown
PURPOSE: Dedicated tumor feeding vessel detection software (TFVDS) using cone beam CT has shown a higher sensitivity to detect tumor feeding vessels during hepatic arterial embolization (HAE) of hepatocellular carcinoma (HCC) compared to 2D imaging. Our primary hypothesis was that HCC tumors treated with HAE guided by a TFVDS would show more complete response (CR) than when treated with 2D imaging alone. Secondary analysis of the impact on X-ray exposure was performed. MATERIALS AND METHODS: Nineteen males and 8 females (median age: 69 year, 46-85) with 44 tumors (median size: 38 mm, 6-100) treated with selective HAE between January 2013 and December 2014 were included...
August 2, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28764925/profile-of-european-proton-and-carbon-ion-therapy-centers-assessed-by-the-eortc-facility-questionnaire
#16
Damien C Weber, André Abrunhosa-Branquinho, Alessandra Bolsi, Andrzej Kacperek, Rémi Dendale, Dirk Geismar, Barbara Bachtiary, Annika Hall, Jens Heufelder, Klaus Herfarth, Jürgen Debus, Maurizio Amichetti, Mechthild Krause, Roberto Orecchia, Vladimir Vondracek, Juliette Thariat, Tomasz Kajdrowicz, Kristina Nilsson, Cai Grau
BACKGROUND: We performed a survey using the modified EORTC Facility questionnaire (pFQ) to evaluate the human, technical and organizational resources of particle centers in Europe. MATERIAL AND METHODS: The modified pFQ consisted of 235 questions distributed in 11 sections accessible on line on an EORTC server. Fifteen centers from 8 countries completed the pFQ between May 2015 and December 2015. RESULTS: The average number of patients treated per year and per particle center was 221 (range, 40-557)...
July 29, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28762335/helium-ions-at-the-heidelberg-ion-beam-therapy-center-comparisons-between-fluka-monte-carlo-code-predictions-and-dosimetric-measurements
#17
T Tessonnier, A Mairani, S Brons, P Sala, F Cerutti, A Ferrari, T Haberer, J Debus, K Parodi
In the field of particle therapy helium ion beams could offer an alternative for radiotherapy treatments, owing to their interesting physical and biological properties intermediate between protons and carbon ions. We present in this work the comparisons and validations of the Monte Carlo FLUKA code against in-depth dosimetric measurements acquired at the Heidelberg Ion Beam Therapy Center (HIT). Depth dose distributions in water with and without ripple filter, lateral profiles at different depths in water and a spread-out Bragg peak were investigated...
August 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28758407/radiation-for-skull-base-meningiomas-review-of-the-literature-on-the-approach-to-radiotherapy
#18
Fabio Y Moraes, Caroline Chung
Skull base meningiomas (SBM) pose unique challenges for radiotherapy as these tumors are often in close proximity to a number of critical structures and may not be surgically addressed in many cases, leaving the question about the tumor grade and expected biological behaviour. External beam radiotherapy and radiosurgery are longstanding treatments for meningioma that are typically used as upfront primary therapy, for recurrent tumors and as adjuvant therapy following surgical resection. There is controversy regarding the optimal timing and approach for radiation therapy in various clinical settings such as the role of adjuvant radiotherapy for completely resected grade 2 tumours...
July 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28741595/3d-range-modulator-for-scanned-particle-therapy-development-monte-carlo-simulations-and-experimental-evaluation
#19
Yuri Simeonov, Uli Weber, Petar Penchev, Toke Printz Ringbæk, Christoph Schuy, Stephan Brons, Rita Engenhart-Cabillic, Jens Bliedtner, Klemens Zink
The purpose of this work was to design and manufacture a 3D range-modulator for scanned particle therapy. The modulator is intended to create a highly conformal dose distribution with only one fixed energy, simultaneously reducing considerably the treatment time. As a proof of concept, a 3D range-modulator was developed for a spherical target volume with a diameter of 5 cm, placed at a depth of 25 cm in a water phantom. It consists of a large number of thin pins with a well-defined shape and different lengths to modulate the necessary shift of the Bragg peak...
August 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28698432/-treatment-strategy-for-soft-tissue-sarcomas
#20
Akihiko Matsumine
Surgical excision is the most reliable treatment for the localized soft tissue sarcoma, and chemotherapy and/or radiation therapy may be recommended as adjuvant therapy, depending on the histologic type, grading, tumor size and location. For the unresectable tumors, radiation therapy including particle beam radiation therapy may be taken into consideration. For the recurrent or metastatic disease, the combination therapy with chemotherapy, radiation therapy and surgical excision may be indicated to improve the patient's prognosis and QOL...
June 2017: Gan to Kagaku Ryoho. Cancer & Chemotherapy
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