An image registration scheme applied to verification of radiation therapy

The British Journal of Radiology
K LeszczynskiS Boyko

Abstract

The introduction of modern conformal radiation therapy techniques requires high geometric precision in treatment delivery which must be verified. For that purpose we have developed an automated system based on registration of portal and simulation (or planning) image pairs. The image registration is performed on anatomical features which are automatically extracted from the portal image. The portal image is then registered with a planning or simulation radiographic image which represents the geometric prescription for the treatment, using an optimized version of the chamfer matching algorithm. Subsequently, the magnitude of the radiation field displacement during treatment is measured by registering the prescribed and treated field boundaries. Algorithms based on chamfer matching and polygon matching have been used for the field boundary registration. Performance of the entire scheme was evaluated on a series of 15 portal images of a pelvic phantom representing various known degrees of the radiation field displacement. The measurements of the radiation field displacements performed by the automated system proved very reliable and after correction for systematic bias agreed to within 1.5 mm or 1 degree with the displacements app...Continue Reading

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Citations

Sep 19, 2001·The British Journal of Radiology·K A Langmack
Apr 22, 2003·IEEE Transactions on Medical Imaging·Ravi BansalJames S Duncan
May 13, 2006·International Journal of Radiation Oncology, Biology, Physics·Sudhakar ChelikaniJames Duncan
Sep 11, 2001·Medical Physics·S Loose, K W Leszczynski
Nov 21, 2008·Journal of Applied Clinical Medical Physics·Patricia LasserreJames Moffat
Mar 11, 1999·Physics in Medicine and Biology·K LeszczynskiE Mvilongo
Feb 24, 2001·Physics in Medicine and Biology·K W Leszczynski, S G Boyko
Oct 25, 2001·Journal of Applied Clinical Medical Physics·M G HermanC R Hagness

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