An X-Ray and Computed Tomography based Registration Method for Patient to Beam Alignment designed for high Reliability despite of degraded X-Ray Image Quality

B. P. Selby, S. Walter, G. Sakas, W.-D. Groch & U. Stilla
Background: To benefit from particle beam cancer treatment accurate tumor to beam alignment is crucial. In image guided radiotherapy (IGRT) this is done by comparison of DRRs from pre-treatment CTs and stereoscopic intra-treatment digital radiography (DR) images. Mutual Information (MI) based similarity[for full text, please go to the a.m. URL]