Share Email Print

Journal of Biomedical Optics

Highly resolved diffuse optical tomography: a systematic approach using high-pass filtering for value-preserved images
Author(s): Min-Cheng Pan; Chien-Hung Chen; Liang-Yu Chen; Min-Chun Pan; Yi-Ming Shyr
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper Abstract

We attempt to develop a systematic scheme through adopting high-pass filtering (HPF) to well resolve value-preserved images such as medical images. Our approach is derived from the Poisson maximum a posteriori superresolution algorithm employing the HP filters, where four filters are considered such as two low-pass-filter-combination based filters, wavelet filter, and negative-oriented Laplacian HP filter. The proposed approach is incorporated into the procedure of finite-element-method (FEM)-based image reconstruction for diffuse optical tomography in the direct current domain, posterior to each iteration without altering the original FEM modeling. This approach is justified with various HPF for different cases that breast-like phantoms embedded with two or three inclusions that imitate tumors are employed to examine the resolution performances under certain extreme conditions. The proposed approach to enhancing image resolution is evaluated for all tested cases. A qualitative investigation of reconstruction performance for each case is presented. Following this, we define a set of measures on the quantitative evaluation for a range of resolutions including separation, size, contrast, and location, thereby providing a comparable evaluation to the visual quality. The most satisfactory result is obtained by using the wavelet HP filter, and it successfully justifies our proposed scheme.

Paper Details

Date Published: 1 March 2008
PDF: 14 pages
J. Biomed. Opt. 13(2) 024022 doi: 10.1117/1.2907344
Published in: Journal of Biomedical Optics Volume 13, Issue 2
Show Author Affiliations
Min-Cheng Pan, Tung Nan Institute of Technology (Taiwan)
Chien-Hung Chen, National Central Univ. (Taiwan)
Liang-Yu Chen, National Central Univ. (Taiwan)
Min-Chun Pan, National Central Univ. (Taiwan)
Yi-Ming Shyr, Taipei Veterans General Hospital (Taiwan)

© SPIE. Terms of Use
Back to Top