Title :
Image restoration in chirp-pulse microwave CT (CP-MCT)
Author :
Bertero, Mario ; Miyakawa, Michio ; Boccacci, Patrizia ; Conte, Francesco ; Orikasa, Kentaroh ; Furutani, Masatoshi
Author_Institution :
Dipt. di Inf. e Sci. dell´´Inf., Genova Univ., Italy
fDate :
5/1/2000 12:00:00 AM
Abstract :
Chirp-pulse microwave computed tomography (CP-MCT) is a technique for imaging the distribution of temperature variations inside biological tissues. Even if resolution and contrast are adequate to this purpose, a further improvement of image quality is desirable. In this paper, we discuss the blur of CP-MCT images and we propose a method for estimating the corresponding point spread function (PSF). To this purpose we use both a measured and a computed projection of a cylindrical phantom. We find a good agreement between the two cases. Finally the estimated PSF is used for deconvolving data corresponding to various kinds of cylindrical phantoms. We use an iterative nonlinear deconvolution method which assures nonnegative solutions and we demonstrate the improvement of image quality which can be obtained in such a way.
Keywords :
biological tissues; biomedical imaging; biothermics; chirp modulation; computerised tomography; deconvolution; image restoration; iterative methods; medical image processing; microwave imaging; temperature distribution; biological tissues; blur; chirp-pulse microwave CT; chirp-pulse microwave computed tomography; computed projection; contrast; cylindrical phantom; image quality; image restoration; iterative nonlinear deconvolution method; nonnegative solutions; point spread function; resolution; temperature variations; Biological tissues; Chirp; Computed tomography; Image quality; Image resolution; Image restoration; Imaging phantoms; Microwave imaging; Microwave theory and techniques; Temperature distribution; Algorithms; Body Temperature; Image Processing, Computer-Assisted; Microwaves; Phantoms, Imaging; Signal Processing, Computer-Assisted; Tomography, X-Ray Computed;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
