Title :
Exact frequency-domain reconstruction for thermoacoustic tomography. II. Cylindrical geometry
Author :
Xu, Yuan ; Xu, Minghua ; Wang, Lihong V.
Author_Institution :
Opt. Imaging Lab., Texas A&M Univ., College Station, TX, USA
fDate :
7/1/2002 12:00:00 AM
Abstract :
For pt. I see ibid., vol. 21, no. 7, p. 823-8 (2002). Microwave-induced thermoacoustic tomography (TAT) in a cylindrical configuration is developed to image biological tissue. Thermoacoustic signals are acquired by scanning a flat ultrasonic transducer. Using a new expansion of a spherical wave in cylindrical coordinates, we apply the Fourier and Hankel transforms to TAT and obtain an exact frequency-domain reconstruction method. The effect of discrete spatial sampling on image quality is analyzed. An aliasing-proof reconstruction method is proposed. Numerical and experimental results are included.
Keywords :
Fourier transforms; acoustic tomography; biomedical ultrasonics; image reconstruction; medical image processing; microwave imaging; thermoacoustics; Hankel transform; aliasing-proof reconstruction method; cylindrical geometry; discrete spatial sampling effect; flat ultrasonic transducer; frequency-domain reconstruction; medical diagnostic imaging; spherical wave expansion; thermoacoustic tomography; ultrasound imaging; Biological tissues; Discrete Fourier transforms; Fourier transforms; Frequency domain analysis; Geometry; Image reconstruction; Image sampling; Reconstruction algorithms; Tomography; Ultrasonic transducers; Adipose Tissue; Algorithms; Animals; Computer Simulation; Fourier Analysis; Image Enhancement; Microwaves; Muscle, Skeletal; Phantoms, Imaging; Reproducibility of Results; Scattering, Radiation; Sensitivity and Specificity; Signal Processing, Computer-Assisted; Swine; Temperature; Tomography; Ultrasonography;
Journal_Title :
Medical Imaging, IEEE Transactions on
DOI :
10.1109/TMI.2002.801171
