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Titolo:
Comparison of two immobilization techniques using portal film and digitally reconstructed radiographs for pediatric patients with brain tumors
Autore:
Zhu, YP; Stovall, J; Butler, L; Ji, Q; Gaber, MW; Samant, S; Sontag, MR; de Armendi, AJ; Merchant, TE;
Indirizzi:
St Jude Childrens Res Hosp, Dept Radiat Oncol, Memphis, TN 38105 USA St Jude Childrens Res Hosp Memphis TN USA 38105 ol, Memphis, TN 38105 USA St Jude Childrens Res Hosp, Dept Anesthesiol, Memphis, TN 38105 USA St Jude Childrens Res Hosp Memphis TN USA 38105 ol, Memphis, TN 38105 USA
Titolo Testata:
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
fascicolo: 4, volume: 48, anno: 2000,
pagine: 1233 - 1240
SICI:
0360-3016(20001101)48:4<1233:COTITU>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLINICAL-PRACTICE; RADIOTHERAPY; CANCER; VERIFICATION;
Keywords:
patient position verification; portal images; digitally reconstructed radiographs; radiotherapy; conformal; immobilization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Zhu, YP St Jude Childrens Res Hosp, Dept Radiat Oncol, 332 N Lauderdale St, Memphis, TN 38105 USA St Jude Childrens Res Hosp 332 N Lauderdale St Memphis TN USA 38105
Citazione:
Y.P. Zhu et al., "Comparison of two immobilization techniques using portal film and digitally reconstructed radiographs for pediatric patients with brain tumors", INT J RAD O, 48(4), 2000, pp. 1233-1240

Abstract

Purpose: To compare the accuracy of two immobilization techniques for pediatric brain tumor patients. Methods and Materials: We analyzed data from 128 treatments involving 22 patients. Patients were immobilized with either a relocatable head frame (12patients) or a vacuum bag (10 patients). Orthogonal portal films were usedas verification images. Errors in patient positioning were measured by comparing verification images with digitally reconstructed radiographs generated by a three-dimensional treatment-planning system. Results: With the head frame, systematic errors ranged from 1.4 mm to 2.1 mm; random errors, from 1.7 mm to 2.1 mm. With the vacuum bag, systematic errors ranged from 2.1 mm to 2.5 mm; random errors, from 2.0 mm to 2.6 mm, For the head frame, the mean length of the radial displacement was 4.4 mm; 90% of the total three-dimensional deviation was less than 6.8 mm, The corresponding values for the vacuum bag were 5.0 and 6.6 mm, respectively. Conclusions: The head frame and vacuum bag techniques limit the random andsystematic errors in each of the three directions to within +/-5 mm, We have used these results to determine the margin used to create the planning target volume for conformal radiation therapy. (C) 2000 Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 17:43:43