In the quality assurance of photon and ion beam radiotherapy with EBT films, the dose response curves of thesefilms should previously be calibrated. The traditional calibration method is to cut a big piece of EBT film...In the quality assurance of photon and ion beam radiotherapy with EBT films, the dose response curves of thesefilms should previously be calibrated. The traditional calibration method is to cut a big piece of EBT film intomany small ones, which are separately irradiated with different doses. Then these small EBT films are digitizedwith a commercial flatbed color scanner to get the net optical density (netOD) values, which are fitted against thedoses. In this work, we present a fast calibration method of EBT films in scanned ion radiotherapy.展开更多
Based on the periodic synchrotron-based beam delivery,a bio-audiovisual feedback breathing guidance technique has been developed to mitigate the interplay between target motion and dynamic beam delivery for ion beam t...Based on the periodic synchrotron-based beam delivery,a bio-audiovisual feedback breathing guidance technique has been developed to mitigate the interplay between target motion and dynamic beam delivery for ion beam therapy,in which variable beam extraction and generation of individualized breathing guidance curve are two key factors.Shown in Fig.1 is the schematic diagram of the breathing guidance technique.Through the simulations with 15 healthy volunteers for the breathing guidance technique,we found not only the treatment efficiency of synchrotron-based pulsed ion beam could be increased effectively,but also the residual movement of respiration during gating window could be reduced.展开更多
To obtain carbon ion beam suitable for the active spot scanning beam delivery system at the Heavy Ion ResearchFacility in Lanzhou (HIRFL), the Monte Carlo (MC) program SHIELD-HIT12A was used to study the influencesof ...To obtain carbon ion beam suitable for the active spot scanning beam delivery system at the Heavy Ion ResearchFacility in Lanzhou (HIRFL), the Monte Carlo (MC) program SHIELD-HIT12A was used to study the influencesof beam delivery distance and structure period of mini ridge filter on full width at the half maximum (FWHM) ofbeam spot and dose flatness at the iso-center of the treatment room.展开更多
文摘In the quality assurance of photon and ion beam radiotherapy with EBT films, the dose response curves of thesefilms should previously be calibrated. The traditional calibration method is to cut a big piece of EBT film intomany small ones, which are separately irradiated with different doses. Then these small EBT films are digitizedwith a commercial flatbed color scanner to get the net optical density (netOD) values, which are fitted against thedoses. In this work, we present a fast calibration method of EBT films in scanned ion radiotherapy.
文摘Based on the periodic synchrotron-based beam delivery,a bio-audiovisual feedback breathing guidance technique has been developed to mitigate the interplay between target motion and dynamic beam delivery for ion beam therapy,in which variable beam extraction and generation of individualized breathing guidance curve are two key factors.Shown in Fig.1 is the schematic diagram of the breathing guidance technique.Through the simulations with 15 healthy volunteers for the breathing guidance technique,we found not only the treatment efficiency of synchrotron-based pulsed ion beam could be increased effectively,but also the residual movement of respiration during gating window could be reduced.
文摘To obtain carbon ion beam suitable for the active spot scanning beam delivery system at the Heavy Ion ResearchFacility in Lanzhou (HIRFL), the Monte Carlo (MC) program SHIELD-HIT12A was used to study the influencesof beam delivery distance and structure period of mini ridge filter on full width at the half maximum (FWHM) ofbeam spot and dose flatness at the iso-center of the treatment room.
