Pixel intensity distribution models for filtered back-projection

Author

Guedon, J.-P. ; Unser, M. ; Bizais, Y.

Author_Institution

FDA, Rockville, MD, USA

fYear

1991

fDate

2-9 Nov. 1991

Firstpage

2063

Abstract

The authors define a pixel intensity distribution model (PIDM) to study the discretization of direct reconstruction schemes in a proper way. For the filtered backprojection (FBP) algorithm, this leads to a derivation of the filter for a B-spline PIDM and its discretization, a simple but exact implementation for this class of functions, and a rule for the sampling ratio relating pixel size to projection cell size according to the device characteristics. Actual phantom reconstructions are presented both for standard and spline FBP schemes. The degree of the B-spline reconstruction is discussed in connection with the angular sampling and the kind of detection task to be applied on the image.<>

Keywords

computerised tomography; image reconstruction; modelling; B-spline reconstruction; angular sampling; device characteristics; filtered back-projection; medical diagnostic imaging; phantom reconstructions; pixel intensity distribution model; pixel size; projection cell size; reconstruction schemes; sampling ratio; Biological system modeling; Biomedical engineering; Convolution; Engineering in medicine and biology; Equations; Filters; Image reconstruction; Image sampling; Sampling methods; Spline;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE

Conference_Location

Santa Fe, NM, USA

Print_ISBN

0-7803-0513-2

Type

conf

DOI

10.1109/NSSMIC.1991.259278

Filename

259278