Results 201 to 210 of about 2,542,698 (234)
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Proton dose calculation based on in-air fluence measurements
Physics in Medicine and Biology, 2008Proton dose calculation algorithms--as well as photon and electron algorithms--are usually based on configuration measurements taken in a water phantom. The exceptions to this are proton dose calculation algorithms for modulated scanning beams. There, it is usual to measure the spot profiles in air.
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Deterministic proton dose calculation from first principles
Physics in Medicine & Biology, 2018Abstract The purpose of this paper is to find a deterministic pencil beam algorithm that computes, from first principles, the dose in some region of interest when a known heterogeneous terrain is irradiated by known proton beams.
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Incorporation of the aperture thickness in proton pencil-beam dose calculations
Physics in Medicine and Biology, 2006Field-specific apertures, of sufficient range-absorbing thickness, are used in the majority of proton-therapy treatments today. In current practice, these apertures are modelled as objects of infinitesimal thickness. Such an approximation, however, is not accurate if the aperture edge is close to, or extends over, the beam axis. Practical situations in
Roelf L, Slopsema, Hanne M, Kooy
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A particle track-repeating algorithm for proton beam dose calculation
Physics in Medicine and Biology, 2005A particle track-repeating algorithm has been developed for proton beam dose calculation for radiotherapy. Monoenergetic protons with 250 MeV kinetic energy were simulated in an infinite water phantom using the GEANT3 Monte Carlo code. The changes in location, angle and energy for every transport step and the energy deposition along the track were ...
J S, Li, B, Shahine, E, Fourkal, C-M, Ma
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Development of an algorithm for proton dose calculation in magnetic fields
Medical PhysicsAbstractBackgroundThe advantages of proton therapy can be further enhanced with online magnetic resonance imaging (MRI) guidance. One of the challenges in the realization of MRI‐guided proton therapy (MRPT) is accurately calculating the radiation dose in the presence of magnetic fields.PurposeThis study aims to develop an efficient and accurate proton ...
Yue, Gu +4 more
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Monte Carlo dose calculations for spot scanned proton therapy
Physics in Medicine and Biology, 2005Density heterogeneities can have a profound effect on dose distributions for proton therapy. Although analytical calculations in homogeneous media are relatively straightforward, the modelling of the propagation of the beam through density heterogeneities can be more problematical.
Tourovsky, A. +3 more
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A simplified analytical random walk model for proton dose calculation
Physics in Medicine & Biology, 2016Abstract We propose an analytical random walk model for proton dose calculation in a laterally homogeneous medium. A formula for the spatial fluence distribution of primary protons is derived. The variance of the spatial distribution is in the form of a distance-squared law of the angular distribution.
Weiguang, Yao +2 more
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Proton Beam Secondary Depth Dose Calculation with Secondary Propagation Model
Radiation Physics and Chemistry, 2022PurposeThis work aims to construct a proton beam secondary depth dose calculation model, thus improving the depth dose accuracy in proton therapy.MethodSecondary dose contributed by the secondary particles is researched in this study. The Secondary Propagation Model (SPM) is constructed to calculate the absolute secondary depth dose.
Junyu Zhang, Yongfei Liang, Chaowen Yang
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Experimental assessment of proton dose calculation accuracy in inhomogeneous media
Physica Medica, 2017Proton therapy with Pencil Beam Scanning (PBS) has the potential to improve radiotherapy treatments. Unfortunately, its promises are jeopardized by the sensitivity of the dose distributions to uncertainties, including dose calculation accuracy in inhomogeneous media.
Sorriaux, Jefferson +8 more
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An efficient dose calculation strategy for intensity modulated proton therapy
Physics in Medicine and Biology, 2011While intensity-modulated proton therapy (IMPT) has great potential to improve the therapeutic efficacy of radiotherapy, IMPT optimization can be computationally demanding, particularly for large and complex tumors. Here we propose a dose calculation strategy to accelerate IMPT optimization while reducing memory requirements.
Yupeng, Li +2 more
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