Continuous wave ultrasonic tomography

Liang, Hai-Dong, Halliwell, M. and Wells, Peter Neil Temple ORCID: https://orcid.org/0000-0002-0409-2841 2001. Continuous wave ultrasonic tomography. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 48 (1) , pp. 285-292. 10.1109/58.896141

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Abstract

As an object rotates with respect to a stationary ultrasonic beam, the scattering centers within the object return echoes that are Doppler-shifted in frequency by amounts depending on the velocities of the individual scatterers. The scattering centers that lie on a line of constant cross-range all have the same effective velocity in the direction pointing toward the transducer; therefore, the backscattered echo amplitude at any particular frequency is the line integral of the scattered radiation at the cross-range corresponding to that frequency. The amplitudes of the returned signals at other frequencies give the line integrals for the scatterers at the corresponding cross-ranges. The amplitude as a function of frequency can be interpreted as a tomographic projection. A continuum of the projections at different positions is generated while the object is rotating. A tomographic reconstruction algorithm can produce an image of the distribution of scattering centers in the insonified object from these projections. A microscanner was developed to investigate the approach of using continuous wave (CW) ultrasound for cross-sectional imaging. The resolution is limited by the target size and the ultrasonic wavelength.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	Q Science > QC Physics R Medicine > R Medicine (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords:	INSPEC Controlled Indexing Doppler shift; acoustic tomography; biomedical ultrasonics; computerised tomography; image reconstruction; medical image processing; ultrasonic equipment; ultrasonic imaging; ultrasonic materials testing; ultrasonic scattering Non Controlled Indexing CW Doppler ultrasound; CW ultrasonic tomography; Doppler-shifted echoes; backscattered echo amplitude; continuous wave US tomography; cross-sectional imaging; line integral; microscanner; resolution limitation; scattering centers; stationary ultrasonic beam; target size; tomographic projection; tomographic reconstruction algorithm; ultrasonic wavelength Medical Subject Heading (MeSH Terms) Algorithms; Anatomy; Cross-Sectional; Image Processing; Computer-Assisted; Phantoms; Imaging; Tomography; X-Ray Computed; Transducers; Ultrasonography; Doppler
ISSN:	0885-3010
Last Modified:	17 Oct 2022 09:07
URI:	https://orca.cardiff.ac.uk/id/eprint/2114

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