Reconstruction method for compensation of surface effects in transillumination laser CT

Author

Yuasa, Tetsuya ; Devaraj, Balasigamani ; Tanosaki, Shinji ; Taniguchi, Hiroshi ; Akatsuka, Takao

Author_Institution

Yamagata Univ., Yonezawa, Japan

Volume

1

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

341

Abstract

A reconstruction method for transillumination laser CT using optical heterodyne detection is proposed. Laser CT does not obey the Radon transform due to surface effects, which occur as a result of refractive index mismatch and bring about an annulus artifact. Optical attenuation with surface effects is described using an affine model. In addition, the constraint derived from the quantitative relationship between projections is introduced in order to obtain a stable solution to the system of equations. This reconstruction produces a least squares problem with the above-mentioned constraint, which is solved via the conjugate gradient method. The method is applied to data from a physical phantom

Keywords

Radon transforms; computerised tomography; conjugate gradient methods; heterodyne detection; image reconstruction; least squares approximations; light absorption; medical image processing; optical tomography; Radon transform; affine model; annulus artifact; coherent detection imaging; conjugate gradient method; least squares problem; medical diagnosis; optical attenuation; optical heterodyne detection; physical phantom; reconstruction method; refractive index mismatch; surface effects compensation; transillumination laser CT; Laser modes; Optical attenuators; Optical detectors; Optical mixing; Optical refraction; Optical variables control; Reconstruction algorithms; Refractive index; Surface emitting lasers; Surface reconstruction;

fLanguage

English

Publisher

ieee

Conference_Titel

Image Processing, 2001. Proceedings. 2001 International Conference on

Conference_Location

Thessaloniki

Print_ISBN

0-7803-6725-1

Type

conf

DOI

10.1109/ICIP.2001.959023

Filename

959023