Newsgroups: sci.image.processing,sci.med.radiology
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From: I.Browbank@lut.ac.uk (Ian Browbank) 
Subject: Digital X-ray Images - Segmentation/Registration
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Date: Wed, 8 Feb 1995 09:17:44 GMT
Reply-To: I.Browbank@lut.ac.uk (Ian Browbank)
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Our research application requires the extraction of 3-D measurements from a 
pair of medical X-ray images. This problem has previously been solved by the 
introduction of metallic (radiopaque) calibration markers into the X-ray images. 
Traditionally the image co-ordinates of these markers are then obtained by a 
lengthy manual inspection process involving X-ray films. In order to speed up 
this measurement process, we are investigating the use of digital image 
processing techniques in conjunction with fluoroscopically obtained images. 

The low resolution of digitised X-rays, in comparison with X-ray film, 
necessitates sub-pixel level segmentation/registration of the calibration markers. 
I would therefore be grateful if anybody could supply me with information/references 
concerning :-

i)   Commercially available image processing software which is suitable to 
     this task. 

ii)  Segmentation strategies which can cope with the variable contrast quality 
     across a X-ray image.

iii) The practicalities of sub-pixel registration techniques (centroiding etc.)


Thanks for your assistance.

Ian Browbank					Email : i.browbank@lut.ac.uk			
Department of Mechanical Engineering
Loughborough University of Technology
Leicestershire
England
LE11 3TU

