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Titolo:
A protocol for the reduction of systematic patient setup errors with minimal portal imaging workload
Autore:
De Boer, HCJ; Heijmen, BJM;
Indirizzi:
Univ Rotterdam Hosp, Dr Daniel Den Hoed Canc Ctr, Div Clin Phys, Dept Radiat Oncol, NL-3008 AE Rotterdam, Netherlands Univ Rotterdam Hosp RotterdamNetherlands NL-3008 AE terdam, Netherlands
Titolo Testata:
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
fascicolo: 5, volume: 50, anno: 2001,
pagine: 1350 - 1365
SICI:
0360-3016(20010801)50:5<1350:APFTRO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
3-DIMENSIONAL CONFORMAL RADIOTHERAPY; RADIATION-THERAPY; VERIFICATION PROCEDURE; CANCER; IRRADIATION; PROSTATE; IMAGES; IMPLEMENTATION; IMMOBILIZATION; SIMULATION;
Keywords:
patient setup accuracy; portal imaging; off-line verification; EPID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: De Boer, HCJ Univ Rotterdam Hosp, Dr Daniel Den Hoed Canc Ctr, Div Clin Phys, Dept Radiat Oncol, Groene Hilledijk 301,POB 5201, NL-3008 AE Rotterdam,Netherlands Univ Rotterdam Hosp Groene Hilledijk 301,POB 5201 Rotterdam Netherlands NL-3008 AE
Citazione:
H.C.J. De Boer e B.J.M. Heijmen, "A protocol for the reduction of systematic patient setup errors with minimal portal imaging workload", INT J RAD O, 50(5), 2001, pp. 1350-1365

Abstract

Purpose: To evaluate a new off-line patient setup correction protocol thatminimises the required number of portal images and perform a comparison with currently applied protocols. Methods and Materials: We compared two types of off-line protocols: (a) the widely applied shrinking action level (SAL) protocol, in which the setup error, averaged over the measured treatment fractions, is compared with a threshold that decreases with the number of measurements, to decide if a correction is necessary; and (b) a new "no-action-level" (NAL) protocol, whichsimply calculates the mean setup error over a filed number of fractions, and always corrects for it. The performance of the protocols was evaluated by applying them to (a) a database of measured setup errors from 600 prostate patients (with, on average, 10 imaged fractions/patient) and (b) Monte Carlo-generated setup error distributions for various values of the population systematic and random errors. Results: The NAL protocol achieved a significantly higher accuracy than the SAI. protocol for a similar workload in terms of image acquisition and analysis, as well as in setup corrections. The SAL protocol required approximately three times more images than the NAL protocol to obtain the same reduction of systematic errors. Application of the NAL protocol to measured setup errors confirmed its efficacy in systematic error reduction in a real patient population. Conclusion: The NAL protocol performed much more efficiently than the SAL protocol for both actually measured and simulated setup data. The resultingdecrease in required portal images not only reduces workload, but also dose to healthy tissue, if dedicated large fields are required for portal imaging (double exposure). (C) 2001 Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 02:55:03