Title :
Thermoacoustic Tomography - Ultrasound Attenuation Artifacts
Author :
Patch, S.K. ; Haltmeier, M.
Author_Institution :
Dept. of Phys., Wisconsin Univ. Milwaukee, WI
fDate :
Oct. 29 2006-Nov. 1 2006
Abstract :
Thermoacoustic computerized tomography (TCT) is a hybrid imaging technique exploiting the thermoacoustic effect. TCT has many parallels with X-ray CT, including frequency dependent attenuation of the measured signal. However, the nature of these attenuation phenomena is nearly opposite: X-ray beams "harden", whereas ultrasound pulses "soften" An analytic formula for an attenuated TCT pulse generat.ed by a homogeneous spherical inclusion is presented. Resulting artifacts in reconstructed X-ray CT and TCT images are compared and contrasted.
Keywords :
bioacoustics; computerised tomography; thermoacoustics; ultrasonic absorption; attenuated TCT pulse; frequency dependent attenuation; homogeneous spherical inclusion; hybrid imaging technique; thermoacoustic computerized tomography; thermoacoustic effect; ultrasound attenuation artifacts; ultrasound pulses; Attenuation measurement; Computed tomography; Frequency dependence; Frequency measurement; Image reconstruction; Optical imaging; Pulse generation; Ultrasonic imaging; Ultrasonic variables measurement; X-ray imaging; Radon transform; artifacts; attenuation; beam hardening; biomedical acoustic imaging; inverse problems; optoacoustic; photoacoustic; thermoacoustic;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2006. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-0560-2
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2006.354441
