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Titolo:
METHODS FOR FULLY AUTOMATED VERIFICATION OF PATIENT SET-UP IN EXTERNAL-BEAM RADIOTHERAPY WITH POLYGON SHAPED FIELDS
Autore:
EILERTSEN K; SKRETTING A; TENNVASSAS TL;
Indirizzi:
NORWEGIAN RADIUM HOSP,DEPT MED PHYS N-0310 OSLO NORWAY UNIV TROMSO,INST MATH & PHYS SCI N-9037 TROMSO NORWAY
Titolo Testata:
Physics in medicine and biology
fascicolo: 6, volume: 39, anno: 1994,
pagine: 993 - 1012
SICI:
0031-9155(1994)39:6<993:MFFAVO>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIGITAL PORTAL IMAGES; EDGE-DETECTION; RADON-TRANSFORM; ACCURACY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
K. Eilertsen et al., "METHODS FOR FULLY AUTOMATED VERIFICATION OF PATIENT SET-UP IN EXTERNAL-BEAM RADIOTHERAPY WITH POLYGON SHAPED FIELDS", Physics in medicine and biology, 39(6), 1994, pp. 993-1012

Abstract

Methods have been developed to perform fully automated comparisons ofthe radiotherapy simulator and portal images in the most common caseswhere the field edges consist of straight lines. The field defining wires or rods in the simulator image, and the edges of the portal image, are localized by means of a truncated Radon transform. Edges are enhanced with the use of a generalized Laplacian operator. From the detected field outlines, a geometrical mapping function is determined that rotates, scales, and translates one image with respect to the other. Asubsequent match of field shapes is executed. If satisfactory agreement is established, the anatomical structures of the simulator and portal images are compared by correlating a new pair of images that only contain the intensity ridges representing bone outlines. The correlation determines the rotation and translation that must be applied to align the anatomical structures. With the simulator image already processed, the remaining automatic processing takes approximately 2 min on a SUN Sparcstation 2. By use of a priori knowledge of the fields, the computation time needed after acquisition of the portal image may be reduced to about 40 s for 512 x 512 images and about 12 s for 256 x 256 images.

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Documento generato il 07/08/20 alle ore 21:06:27