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Titolo:
PERFORMANCE OF A VIDEO-IMAGE-SUBTRACTION-BASED PATIENT POSITIONING SYSTEM
Autore:
MILLIKEN BD; RUBIN SJ; HAMILTON RJ; JOHNSON LS; CHEN GTY;
Indirizzi:
UNIV ILLINOIS,CHICAGO HOSP,M-C 933 EM C-200,1740 W TAYLOR ST CHICAGO IL 60612 UNIV CHICAGO,DEPT RADIOL CHICAGO IL 60637 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL CHICAGO IL 60637
Titolo Testata:
International journal of radiation oncology, biology, physics
fascicolo: 4, volume: 38, anno: 1997,
pagine: 855 - 866
SICI:
0360-3016(1997)38:4<855:POAVPP>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
RADIATION-THERAPY; PORTAL IMAGES; RADIOTHERAPY; ACCURACY; FILM; HEAD;
Keywords:
PATIENT POSITIONING; VIDEO IMAGING; CONFORMAL THERAPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
B.D. Milliken et al., "PERFORMANCE OF A VIDEO-IMAGE-SUBTRACTION-BASED PATIENT POSITIONING SYSTEM", International journal of radiation oncology, biology, physics, 38(4), 1997, pp. 855-866

Abstract

Purpose: We have developed and tested an interactive video system that utilizes image subtraction techniques to enable high precision patient repositioning using surface features. We report quantitative measurements of system performance characteristics. Methods and Materials: Video images can provide a high precision, low cost measure of patient position. Image subtraction techniques enable one to incorporate detailed information contained in the image of a carefully verified reference position into real-time images. We have developed a system using video cameras providing orthogonal images of the treatment setup. The images are acquired, processed and viewed using an inexpensive frame grabber and a PC. The subtraction images provide the interactive guidanceneeded to quickly and accurately place a patient in the same positionfor each treatment session,We describe the design and implementation of our system, and its quantitative performance, using images both to measure changes in position, and to achieve accurate setup reproducibility. Results: Under clinical conditions (60 cm field of view, 3.6 m object distance), the position of static, high contrast objects could be measured with a resolution of 0.04 mm (rms) in each of two dimensions. The two-dimensional position could be reproduced using the real-time image display with a resolution of 0.15 mm (rms). Two-dimensional measurement resolution of the head of a patient undergoing treatment forhead and neck cancer was 0.1 mm (rms), using a lateral view, measuring the variation in position of the nose and the ear over the course ofa single radiation treatment. Three-dimensional repositioning accuracy of the head of a healthy volunteer using orthogonal camera views wasless than 0.7 mm (systematic error) with an rms variation of 1.2 mm. Setup adjustments based on the video images were typically performed within a few minutes. The higher precision achieved using the system tomeasure objects than to reposition them suggests that the variabilityin repositioning is dominated by the ability of the therapist to makesmall, controlled changes in the position of the patient. Conclusion:Using affordable, off-the-shelf technology, we have developed a patient positioning system that achieves repositioning accuracy normally associated with fractionated stereotactic systems. The technique provides real-time guidance and can be used to easily and quickly correct patient setup before every treatment, thus significantly reducing overallrandom positioning error. This improved positioning capability provides the precision required to realize the potential gains of conformal radiotherapy. (C) 1997 Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 20:15:39