A 3D model to calculate water-to-air stopping power ratio in therapeutic carbon ion fields
نویسندگان
چکیده
Siemens AG, Healthcare Sector, Imaging, Particle Therapy, Hofmannstr. 26, 91052 Erlangen, Germany Ruprecht-Karls-Universität Heidelberg, Faculty of Physics and Astronomy, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany Heidelberg Ion Therapy Center and Department of Radiation Oncology, Im Neuenheimer Feld 450, 69120 Heidelberg, Germany Present address: Department of Radiation Oncology, University of Pennsylvania, TRC 4 West, 3400 Civic Center Bvd, Philadelphia, 19104 PA, USA Present address: Faculty of Physics at Ludwig Maximilian University of Munich, Am Coulombwall 1, 85748 Garching b. Munich, Germany *Corresponding author. Department of Radiation Oncology, University of Pennsylvania, TRC 4 West, 3400 Civic Center Bvd, Philadelphia, 19104 PA, USA. Tel: +1-215-662-3088; Fax: +1-215-616-5600; Email: [email protected]
منابع مشابه
Ionization chamber dosimetry of small photon fields: a Monte Carlo study on stopping-power ratios for radiosurgery and IMRT beams.
Absolute dosimetry with ionization chambers of the narrow photon fields used in stereotactic techniques and IMRT beamlets is constrained by lack of electron equilibrium in the radiation field. It is questionable that stopping-power ratio in dosimetry protocols, obtained for broad photon beams and quasi-electron equilibrium conditions, can be used in the dosimetry of narrow fields while keeping ...
متن کاملAnalytical expressions for water-to-air stopping-power ratios relevant for accurate dosimetry in particle therapy.
In particle therapy, knowledge of the stopping-power ratio (STPR) of the ion beam for water and air is necessary for accurate ionization chamber dosimetry. Earlier work has investigated the STPR for pristine carbon ion beams, but here we expand the calculations to a range of ions (1 ≤ z ≤ 18) as well as spread-out Bragg peaks (SOBPs) and provide a theoretical in-depth study with a special focus...
متن کاملThe Comparison of the shares of stopping power in a soft tissue-equivalent material
Introduction: Proton therapy is a type of radiation treatment that it uses protons to treat cancer. Because of the protons’ unique ability to distribute the radiation dose more directly to the tumor, it minimizes the damage to nearby healthy tissues. The rate of energy loss by the ion in the target is called stopping power. The total stopping power is sum nuclear and electroni...
متن کاملApplication of MCNP4C Monte Carlo code in radiation dosimetry in heterogeneous phantom
Background: In treating patients with radiation, the degree of accuracy for the delivery of tumor dose is recommended to be within ± 5% by ICRU in report 24. The experimental studies have shown that the presence of low-density inhomogeneity in areas such as the lung can lead to a greater than 30% change in the water dose data. Therefore, inhomogeneity corrections should be used in treatment pla...
متن کاملLocal Field Correction Effect on Dicluster Stopping Power in a Strongly Coupled Two-Dimensional Electron Gas System
We calculate the stopping power for heavy-ion diclusters moving in a strongly coupled two-dimensional electron gas system by using the local field corrected dielectric function at finite temperature. We obtain a parameterized local field correction factor based on a relation between the thermal compressibility and exchange-correlation energy in two-dimension. The interpolated parameter is deriv...
متن کامل