Search for dissertations about: "pencil beam"

Showing result 6 - 10 of 17 swedish dissertations containing the words pencil beam.

2. 6. Modeling Silicon Diode Dose Response in Radiotherapy Fields using Fluence Pencil Kernels

   Author : Karin Eklund; Anders Ahnesjö; Erik Grusell; Hugo Palmans; Uppsala universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radiological physics; Radiofysik; Medicinsk radiofysik; Medical Radiophysics;

   Abstract : In radiotherapy, cancer is treated with ionizing radiation, most commonly bremsstrahlung photons from electrons of several MeV. Secondary electrons produced in photon-interactions results in dose deposition. The treatment response is low for low doses, raises sharply for normal treatment doses and saturates at higher doses. READ MORE

4. 7. Development and application of composite energy deposition kernels for photon therapy planning

   Author : Anders Eklöf; Simo Hyödynmaa; Stockholms universitet; []
   Keywords : Energy deposition kernels; volume overlap algorithm; radiotherapy planning; photon pencil beams; treatment optimization; biological treatment objectives; medicinsk strålningsfysik; Medical Radiation Physics;

   Abstract : In recent years, the use of optimization algorithms in radiation therapy planning has increased dramatically. All optimization algorithms as well as most modern implementations of conventional therapy planning, use energy deposition kernels as a fundamental part of the calculations. READ MORE

5. 8. Fast neutron dosimetry : a study of basic dosimetric properties of fast-neutrons for external beam radiotherapy and problems associated with corrections of measured charged particle cross-sections

   Author : Jonas Söderberg; Lennart Lindborg; Linköpings universitet; []
   Keywords : MEDICINE; MEDICIN;

   Abstract : Basic dosimetric properties of fast-neutron beams with energies ≤80 MeV were explored using Monte Carlo techniques. Elementary pencil-beam dose distributions taking into account transport of all relevant types of released charged particles (protons, deuterons, tritons, 3He and a particles) were calculated and used to derive several absorbed dose distributions. READ MORE

6. 9. Dosimetry and radiation quality in fast-neutron radiation therapy : A study of radiation quality and basic dosimetric properties of fast-neutrons for external beam radiotherapy and problems associated with corrections of measured charged particle cross-sections

   Author : Jonas Söderberg; Gudrun Alm Carlsson; Crister Ceberg; Linköpings universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Neutron; Dosimetry; Radiotherapy; Monte Carlo; Microdosimetry; Cross-section; RBE; LET; Energy-loss corrections; Radiological physics; Radiofysik;

   Abstract : The dosimetric properties of fast-neutron beams with energies ≤80 MeV were explored using Monte Carlo techniques. Taking into account transport of all relevant types of released charged particles (electrons, protons, deuterons, tritons, 3He and α particles) pencil-beam dose distributions were derived and used to calculate absorbed dose distributions. READ MORE

7. 10. From Particle-Production Cross Sections to KERMA and Absorbed Dose for the Case 96 MeV n-12C Interactions

   Author : Bel E. Bergenwall; Ayşe Ataç; Eva Lund; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; Fast neutrons; En = 96 MeV; charged-particle production; 12C n; px ; 12C n; dx ; 12C n; tx ; 12C n; 3Hex ; 12C n; ax reactions; cross sections; KERMA; microscopic measurements; absorbed dose; Kärnfysik; Nuclear physics; Kärnfysik;

   Abstract : Neutron-carbon interactions have been studied with a focus on charged-particle production of relevance to radiation protection and medical applications, such as cancer therapy. The measurements have been performed using the particle-detection setup, MEDLEY, and the 96 MeV neutron beam at the The Svedberg Laboratory in Uppsala. READ MORE