Ultrasonic pulsed echo tomography using narrow aperture phased array

Author

Akiyama, Iwaki ; Takizawa, Naoki ; Ohya, Akihisa

Author_Institution

Dept. of Electr. Eng., Shonan Inst. of Technol., Fujisawa, Japan

Volume

2

fYear

1999

fDate

1999

Firstpage

1613

Abstract

This method is based on the Radon transform of echoes using narrow aperture phased array (NAPA). When the NAPA is used, the echoes are expressed as the summation of the wavelets that are returned from the scatterers on the arc. It means that a series of the echoes as a sector scanning is a projection of reflectivity coefficient distribution on the hemispherical surface. Here, the authors discuss the spatial resolution between NAPA-CT and conventional B-mode image by numerical calculation. As a result, for both of lateral direction and the direction of elevation NAPA-CT has better resolution than the conventional B-mode image

Keywords

Radon transforms; acoustic tomography; biomedical ultrasonics; image reconstruction; image resolution; medical image processing; wavelet transforms; conventional B-mode image; hemispherical surface; lateral direction; medical diagnostic imaging; narrow aperture phased array; numerical calculation; reflectivity coefficient distribution; ultrasonic pulsed echo tomography; wavelets summation; Acoustic beams; Acoustic scattering; Apertures; Focusing; Image resolution; Lenses; Phased arrays; Spatial resolution; Tomography; Ultrasonic imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE

Conference_Location

Caesars Tahoe, NV

ISSN

1051-0117

Print_ISBN

0-7803-5722-1

Type

conf

DOI

10.1109/ULTSYM.1999.849304

Filename

849304