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Mevion nabs FDA OK for proton therapy system

Mevion Medical Systems has received 510(k) clearance from the U.S. Food and...Read more on AuntMinnie.comRelated Reading: Mevion submits 510(k) to FDA for proton therapy system Mevion touts scanning milestone Mevion joins forces with MedPhoton Mevion completes milestone installation Mevion completes Fla. installation
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news

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This study describes the development of a beam monitoring system for the verification of entrance dose map in pencil beam scanning (PBS) proton therapy based on fiber optic radiation sensors (FORS) and the validation of this system through a feasibility study. The beam monitoring system consisted of 128 optical fibers optically coupled to photo-multiplier tubes. The performance of the beam monitoring system based on FORS was verified by comparing 2D dose maps of square-shaped fields of various sizes, which were obtained using conventional dosimeters such as MatriXX and EBT3 film, with those measured using FORS. The resulti...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
In conclusion, collimated edge-enhancement combined with the variable pre-absorber is the recommended setting to minimize the lateral penumbra for PBS. Without collimator, it would be favourable to use a variable pre-absorber for large air gaps and an automatic pre-absorber for small air gaps. PMID: 29324441 [PubMed - in process]
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research
Mevion Medical Systems, a company specializing in accelerating protons to very high energies, has now received FDA clearance for its new MEVION S250i system for intensity modulated proton therapy. The product features the company’s HYPERSCAN pe...
Source: Medgadget - Category: Medical Devices Authors: Tags: Oncology Radiation Oncology Source Type: blogs
Mevion Medical Systems said yesterday it won FDA 510(k) clearance for its Mevion S250i proton therapy system featuring pencil beam scanning technology, and touted that the first unit was installed at MedStar Georgetown University Hospital in Washington D.C. The Mevion S250i features improved pencil beam scanning fields and Hyperscan pencil beam scanning tech to allow for faster energy layer switching, the Littleton, Mass.-based company said. “The S250i system represents the next generation of intensity modulated proton therapy (IMPT) delivered in the most compact proton therapy platform. We are proud that the ME...
Source: Mass Device - Category: Medical Devices Authors: Tags: 510(k) Food & Drug Administration (FDA) Oncology Regulatory/Compliance Mevion Medical Systems Source Type: news
ltran With robust optimization for spot scanning proton therapy now commercially available, the ability exists to account for setup, range, and interfield uncertainties during optimization. Robust optimization is particularly beneficial for craniospinal irradiation (CSI) where the large target volume lends itself to larger setup uncertainties and the need for robust match lines can all be handled with the uncertainty parameters found inside the optimizer. Suggested robust optimization settings, parameters, and image guidance for CSI patients using proton therapy spot scanning are provided. Useful structures are defined...
Source: Cancers - Category: Cancer & Oncology Authors: Tags: Technical Note Source Type: research
In conclusion, collimated edge-enhancement combined with the variable pre-absorber is the recommended setting to minimize the lateral penumbra for PBS. Without collimator, it would be favourable to use a variable pre-absorber for large air gaps and an automatic pre-absorber for small air gaps. PMID: 29256441 [PubMed - as supplied by publisher]
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research
This study quantifies the dosimetric accuracy of a commercial treatment planning system as functions of treatment depth, air gap, and range shifter thickness for superficial pencil beam scanning proton therapy treatments. The RayStation 6 pencil beam and Monte Carlo dose engines were each used to calculate the dose distributions for a single treatment plan with varying range shifter air gaps. Central axis dose values extracted from each of the calculated plans were compared to dose values measured with a calibrated PTW Markus chamber at various depths in RW3 solid water. Dose was measured at 12 depths, ranging from the sur...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research
Abstract In spot-scanning proton therapy, highly precise beam control is required in the treatment nozzle such that the proton beam does not spread out during transportation by restraining the divergence of the beam angle and spot size, simultaneously. In order to evaluate the beam-broadening behaviour induced by passing through the various nozzle components, we have developed a new method to calculate the angular divergence profile of a proton beam in the nozzle. The angular divergence of the proton beam for each nozzle component is calculated by the Monte Carlo simulation code, Geant4, assuming that the initial ...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research
There was an error in the D5-D95 in Figure  4 on page 179. The data has been corrected here. The correction to this parameter still supports the conclusion if the criteria of D5-D95 was taken as 7%.
Source: International Journal of Radiation Oncology * Biology * Physics - Category: Radiology Tags: Erratum Source Type: research
CONCLUSION: Both Eclipse and Raystation PB TPS are not always accurate within ±3% for a 5 cm range shifters or for small targets. This was improved with the Raystation MC model. The point dose calculations of Eclipse, Raystation PB, and Raystation MC compare within ±3% to measured doses for the other scenarios tested. PMID: 29205763 [PubMed - as supplied by publisher]
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research
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