1.
IEEE Trans Biomed Eng
; 58(8)2011 Aug.
Article
in English
| MEDLINE
| ID: mdl-21421431
ABSTRACT
Thermoacoustic signals are generated over a large field of view by 900 ns TE10 pulses with 108 MHz carrier frequency. Test specimens selectively absorb the TE10 pulse energy producing rapid thermal expansions that generate ultrasonic pulses. 108 MHz irradiation provides excellent depth penetration in soft tissue, allowing blood and physiologic saline to generate strong signals. Thermoacoustic signal generation from a depth of several cm is well above our systems noise floor. Rotating the test specimen provides single-slice tomographic signal encoding. Filtered back-projection reconstruction yields images over a 6.4 cm field of view. Reconstructions of tissue mimicking prostate phantoms and fresh porcine kidney tissue are presented.