NDLI: Practical improvement of geometric parameter estimation for cone beam microCT imaging

Content Provider	IEEE Xplore Digital Library
Author	Sawyer, S.A. Frey, E.C.
Copyright Year	2005
Description	Author affiliation: Dept. of Radiol., Johns Hopkins Univ., Baltimore, MD, USA (Sawyer, S.A.; Frey, E.C.)
Abstract	Accurate physical measurement of system geometric misalignments is difficult, so an accurate method of estimating the geometric parameters is needed. Several methods have been proposed that involve measuring projections of spheres at multiple projection views. For high resolution microCT systems, the estimation accuracy of the projected position of the sphere center is a critical factor in determining the geometric parameter accuracy. We have investigated several methods for improving the sphere center estimation. We simulated spheres of varying diameters and used several methods to estimate the positions of the projected sphere centers. The estimated center positions served as the input to methods for estimating the geometric parameters in order to assess the effect on geometric parameter accuracy. The center estimation methods investigated included computing the centroid and fitting the projection with a Gaussian or the analytic equation for the cone beam projection of a sphere. We found that the differences between the true and estimated projected center positions were smaller when fitted with the sphere's projection equation. In addition, using smaller spheres resulted in improved estimate accuracy. Using a phantom consisting of three 1 mm diameter spheres and with curve fitting to estimate the position of the spherical center, we were are able to obtain artifact-free reconstructions for a 42 /spl mu/m pixel size on our prototype physical microCT system.
Starting Page	2315
Ending Page	2319
File Size	354671
Page Count	5
File Format	PDF
ISBN	0780392213
ISSN	10957863
DOI	10.1109/NSSMIC.2005.1596797
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-23
Publisher Place	Puerto Rico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Parameter estimation Detectors Image reconstruction Equations Imaging phantoms Biomedical imaging Physics Radiology Telephony Computational modeling
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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