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Titolo:
Radiotherapy of pelvic malignancies: impact of two types of rigid immobilisation devices on localisation errors
Autore:
Mitine, C; Hoornaert, MT; Dutreix, A; Beauduin, M;
Indirizzi:
Jolimont Hosp, Dept Radiat Oncol, B-7100 Haine St Paul, Belgium Jolimont Hosp Haine St Paul Belgium B-7100 B-7100 Haine St Paul, Belgium Univ Hosp Gasthuisberg, Dept Radiotherapy, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg Louvain Belgium B-3000 y, B-3000 Louvain, Belgium
Titolo Testata:
RADIOTHERAPY AND ONCOLOGY
fascicolo: 1, volume: 52, anno: 1999,
pagine: 19 - 27
SICI:
0167-8140(199907)52:1<19:ROPMIO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
RADIATION-THERAPY; PORTAL IMAGES; IMMOBILIZATION; ACCURACY; PROSTATE; CANCER; REPRODUCIBILITY; IRRADIATION; HEAD;
Keywords:
radiotherapy treatment errors; immobilisation devices; pelvic cancer; portal films;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Mitine, C Jolimont Hosp, Dept Radiat Oncol, Rue Ferrer 159, B-7100 Haine St Paul, Belgium Jolimont Hosp Rue Ferrer 159 Haine St Paul Belgium B-7100 lgium
Citazione:
C. Mitine et al., "Radiotherapy of pelvic malignancies: impact of two types of rigid immobilisation devices on localisation errors", RADIOTH ONC, 52(1), 1999, pp. 19-27

Abstract

Background and purpose: To determine the distribution of set-up errors forpatients treated with and without two rigid partial immobilisation devicesfor pelvic malignancies. Materials and methods: 30 patients receiving pelvic irradiation with a four field technique underwent a total of 524 portal films. The patients are divided into 3 cohorts of 10 patients. The first cohort is treated on a standard treatment couch without immobilisation device (NI); the second and third cohorts are treated with a custom-made immobilisation device used in an attempt to improve set-up accuracy: an Alpha-Cradle mattress (1) (AM) or anOrfit cast (2) (OC). Set-up deviations are analysed in the X, Y, Z directions of a fixed coordinate system, corresponding to the lateral, cranio-caudal and antero-posterior direction, respectively. Results: Considering the percentage of discrepancies less than or equal to5 mm between the simulation films and the portal films as a measure of set-up accuracy, immobilisation devices seem to increase accuracy: 88.5% (X) 79% (Y) and 100% (Z) with AM; 84% (X-Y), 97.5% (Z) with OC and only 76.5% (X), 40% (Y) and 65.5% (Z) far NI. The distribution of the systematic set-up errors for the three patient cohorts, defined as the mean patient displacement for the treatment course, had a mean and a standard deviation of (0.7 +/- 2.7) mm in the X-axis, (-5.5 +/- 2.6) mm in the Y-axis and (-0.9 +/- 2.2) mm in the Z-axis when no immobilisation is addled; (0.8 +/- 1.7) mm, (-2 /- 2.7) mm and (0.3 +/- 0.4) mm for the Alpha-Cradle group; (0.3 +/- 1.4) mm, (0.5 +/- 1.1) mm and (0.5 +/- 0.6) mm for the Orfit cast group. The distribution of random errors about the mean approximated a normal distribution and the standard deviations are 4.4 mm (X), 4.2 mm (Y) and 4.8 mm (Z) forNI; 3.3, 3.5 and 2.5 mm for the AM; 3.4, 3.3 and 2.7 mm for the OC. Conclusions: The two rigid immobilisation devices improve the reproducibility of a given pelvic held but there is a small benefit comparative to the cost and the cumbersome place of the devices. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 20:11:52