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Titolo:
REPRODUCIBILITY OF PATIENT POSITIONING DURING ROUTINE RADIOTHERAPY, AS ASSESSED BY AN INTEGRATED MEGAVOLTAGE IMAGING-SYSTEM
Autore:
GILDERSLEVE J; DEARNALEY DP; EVANS PM; SWINDELL W;
Indirizzi:
ROYAL MARSDEN HOSP,NHS TRUST,DEPT RADIOTHERAPY,DOWNS RD SUTTON SM2 5PT SURREY ENGLAND ROYAL MARSDEN HOSP,NHS TRUST,DEPT RADIOTHERAPY SUTTON SM2 5PT SURREY ENGLAND ROYAL MARSDEN HOSP,NHS TRUST,JOINT DEPT PHYS SUTTON SM2 5PT SURREY ENGLAND CANC RES INST SUTTON SM2 5PT SURREY ENGLAND
Titolo Testata:
Radiotherapy and oncology
fascicolo: 2, volume: 35, anno: 1995,
pagine: 151 - 160
SICI:
0167-8140(1995)35:2<151:ROPPDR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIGITAL PORTAL IMAGES; EXTERNAL-BEAM RADIOTHERAPY; FIELD PLACEMENT ERRORS; RADIATION-THERAPY; VERIFICATION; DEVICE; ACCURACY; SETUP; VISUALIZATION; LOCALIZATION;
Keywords:
RADIOTHERAPY; TREATMENT ACCURACY; RANDOM ERROR; SYSTEMATIC ERROR; MEGAVOLTAGE IMAGING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
J. Gildersleve et al., "REPRODUCIBILITY OF PATIENT POSITIONING DURING ROUTINE RADIOTHERAPY, AS ASSESSED BY AN INTEGRATED MEGAVOLTAGE IMAGING-SYSTEM", Radiotherapy and oncology, 35(2), 1995, pp. 151-160

Abstract

A portal imaging system has been used, in conjunction with a movie measurement technique to measure set-up errors for 15 patients treated with radiotherapy of the pelvis and for 12 patients treated with radiotherapy of the brain. The pelvic patients were treated without fixationdevices and the brain patients were treated with individually-mouldedplastic shells. As would be expected the brain treatments were found to be more accurate than the pelvic treatments. Results are presented in terms of five error types: random error from treatment to treatment, error between mean treatment position and simulation position, random simulation error, systematic simulator-to-treatment errors and totaltreatment error. For the brain patients the simulation-to-treatment error predominates and random treatment errors were small (95% less than or equal to 3 mm, 77% less than or equal to 1.5 mm). Vector components of the systematic simulation-to-treatment errors were 1-2 mm with maximal random simulation error of +/- 5 mm (2 S.D.). There is much interest in the number of verification films necessary to evaluate treatment accuracy. These results indicate that one check film performed at the first treatment is likely to be sufficient for set-up evaluation. For the pelvis the random treatment error is larger (95% less than or equal to 4.5 mm, 87% less than or equal to 3 mm). The systematic simulation-to-treatment error is up to 3 mm and the maximal random simulation error is +/- 6 mm (2 S.D.). Thus corrections made solely on the basis of a first day check film may not be sufficient for adequate set-upevaluation.

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Documento generato il 03/07/20 alle ore 15:30:39