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Titolo:
TRANSFER ERRORS OF PLANNING CT TO SIMULATOR - A POSSIBLE SOURCE OF SETUP INACCURACIES
Autore:
BEL A; BARTELINK H; VIJLBRIEF RE; LEBESQUE JV;
Indirizzi:
NETHERLANDS CANC INST,DEPT RADIOTHERAPY,ANTONI VAN LEEUWENHOEK HUIS,PLESMANLAAN 121 1066 CX AMSTERDAM NETHERLANDS
Titolo Testata:
Radiotherapy and oncology
fascicolo: 2, volume: 31, anno: 1994,
pagine: 176 - 180
SICI:
0167-8140(1994)31:2<176:TEOPCT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
PORTAL IMAGES; IONIZATION-CHAMBER; BOOST TECHNIQUE; IMAGING DEVICE; PATIENT SETUP; RADIOTHERAPY; ACCURACY;
Keywords:
PORTAL IMAGING; DRR; PATIENT SETUP ACCURACY;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
A. Bel et al., "TRANSFER ERRORS OF PLANNING CT TO SIMULATOR - A POSSIBLE SOURCE OF SETUP INACCURACIES", Radiotherapy and oncology, 31(2), 1994, pp. 176-180

Abstract

The purpose of this study was to analyse whether the intended patientsetup, based on a CT scan, was different from the setup at the simulator. Furthermore, we investigated how these possible transfer errors between the planned patient setup and the actual simulator setup affected the resulting overall treatment setup accuracy. Two groups, of 15 prostate patients each, were studied. For one group (group II), the simulation time was about twice as large as for the other (group I), since digitally reconstructed radiographs (DRRs) were used to get a good visual agreement between the intended and the simulator setup. For the purpose of this study DRRs were also calculated for the patients in group I, and for both groups DRRs were matched with the simulator imagesto obtain quantitative data of the transfer errors. The resulting overall treatment setup accuracy was determined by comparing the DRRs with portal images. For group I, the standard deviations (SD) of the differences between the DRRs and the simulator images ('transfer errors') were 1.5 mm and 4.5 mm in the lateral (x) and cranio-caudal (y) direction, respectively. For group II the SDs were smaller: 1.4 mm and 1.5 mm in the x- and y-direction, respectively. For both groups, the magnitude of the overall mean was less than 1.3 mm. For group I, the SDs of the resulting overall setup deviations during treatment were 1.6 mm and 4.1 mm in the x- and y-direction, respectively. For group II, these figures were 2.4 mm and 2.6 mm, respectively. For both groups, the magnitude of the overall mean was less than 1.0 mm. It can be concluded that transfer errors can be the predominant factor in the treatment accuracy since the transfer errors from CT to simulator can be larger than differences between the simulator and accelerator. By a careful simulation, including the use of a DRR, the amount of transfer errors, andconsequently the treatment inaccuracy, can be reduced considerably.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 06:36:37