Feasibility of motion estimation and tracking in portal images during treatment of pulmonary cancers by conformal radiotherapy

• Autorzy: Orkisz M. , Frery A. , Durning B. , Chapet O. , Magnin I.
• Konferencja: International Conference on Computer Analysis of Images and Patterns (9 ; 2001 ; Warszawa)
• Języki publikacji: EN

Abstrakty

EN

Medical objective of this work is to compensate tumor's displacements due to free breathing, so as to reduce the irradiated zone and thus preserve healthy tissues. For this purpose, we are studying the feasibility of tracking the tumor's motion in portal images, i.e. in images generated by the treatment beam (high-energy X-rays). Two reference algorithms were tested on sequences of portal images of a phantom and of patients. Target tracking algorithm (block-matching), was able to correctly track the target only when the tumor was perceptible in the images. Otherwise it would require implanting of radioopaque markers in tumor's vicinity. Optical flow estimation was expected to deduce "invisible" tumor's displacements from the motion of neighboring tissues. However, the standard Horn & Schunck's algorithm gave poor results because of low contrast and absence of texture in the images. We are suggesting a modified version of this approach, based on intersections of motion constraint lines for a limited number of pixels carrying reliable and complementary motion information.

Słowa kluczowe

EN

cancer; conformal radiotherapy; image sequence; medical imaging; motion estimation; target tracking

PL

estymacja ruchu; obrazowanie w medycynie; radioterapia konforemna; rak; sekwencja obrazu; śledzenie celu

• Wydawca: Instytut Telekomunikacji i Informatyki Uniwersytetu Technologiczno-Przyrodniczego w Bydgoszczy
• Czasopismo: Image Processing & Communications
• Rocznik: 2001
• Tom: Vol. 7, no 3-4
• Strony: 63--76
• Opis fizyczny: Bibliogr. 17 poz.,Rys., wykr.,

Twórcy

autor

Orkisz M.

autor

Frery A.

autor

Durning B.

autor

Chapet O.

autor

Magnin I.

• CREATIS, CNRS Research Unit #5515 affliated to INSERM, INSA de Lyon, Bt. Blaise Pascal, 7 rue J. Capelle, F-69621 Villeurbanne codex Lyon, France