Title :
A novel portal imaging device for advanced radiation therapy
Author :
Iacobaeus, C. ; Brahme, A. ; Danielsson, M. ; Fonte, P. ; Ostling, J. ; Peskov, V. ; Wallmark, M.
Author_Institution :
Dept. of Med. Radiat. Phys., Karolinska Inst., Stockholm, Sweden
fDate :
8/1/2001 12:00:00 AM
Abstract :
A new detector for portal imaging is under development, which could greatly improve the alignment of the radiation beam with respect to the tumor during radiation treatment. The detector is based on gaseous and solid converters combined with gas electron multipliers (GEMs) as an amplification structure. The detector will have a large area and will be operated in a very high-rate environment. A prototype has been built and extensively tested, both with high-rate X-rays as well, in a clinical environment at the Karolinska Hospital. High rates and alpha particles could cause discharges in the GEM and discharge propagation from GEM to GEM and to the readout electronics. Since reliability is one of the main requirements for the portal imaging device, we performed systematic studies to find a safe-operating range of the device, free from typical high-rate problems, such as discharges
Keywords :
X-ray detection; biomedical electronics; biomedical equipment; diagnostic radiography; electron multiplier detectors; image convertors; proportional counters; radiation therapy; readout electronics; Racetrack unit; advanced radiation therapy; delayed breakdown; gas chamber; gas electron multipliers; gaseous converters; high-rate X-rays; large area detector; photon imaging detector; portal imaging detector; radiation beam alignment; readout electronics; reliability; safe-operating range; solid converters; tumour treatment; Alpha particles; Biomedical applications of radiation; Electron multipliers; Hospitals; Neoplasms; Portals; Prototypes; Radiation detectors; Testing; X-rays;
Journal_Title :
Nuclear Science, IEEE Transactions on
