TY - JOUR
T1 - Tangential resolution improvement in thermoacoustic and photoacoustic tomography using a negative acoustic lens
AU - Pramanik, Manojit
AU - Ku, Geng
AU - Wang, Lihong V.
N1 - Funding Information:
This work was supported by National Institutes of Health Grant Nos. R01 EB000712 and R01 NS046214. L.W. has a financial interest in Endra, Inc., which however did not support this work. We would also like to thank Dr. Changhui Li for his assistance with the accurate reconstruction algorithm used for TAT and PAT image reconstruction.
PY - 2009
Y1 - 2009
N2 - We developed a novel concept of using a negative acoustic lens to increase the acceptance angle of an unfocused large-area ultrasonic transducer (detector), leading to more than twofold improvement of the tangential resolution in both thermoacoustic and photoacoustic tomography. In both thermoacoustic and photoacoustic tomography, for a given transducer bandwidth, the aperture size of the detector affects the tangential resolution greatly when the object of interest is near the detector surface. We were able to overcome such tangential resolution deterioration by attaching an acoustic concave lens, made of acrylic in front of the flat detector surface. We then quantified the tangential resolution improvement using phantom images. We also showed that the use of the negative lens preserves the shape of an object after the image is reconstructed.
AB - We developed a novel concept of using a negative acoustic lens to increase the acceptance angle of an unfocused large-area ultrasonic transducer (detector), leading to more than twofold improvement of the tangential resolution in both thermoacoustic and photoacoustic tomography. In both thermoacoustic and photoacoustic tomography, for a given transducer bandwidth, the aperture size of the detector affects the tangential resolution greatly when the object of interest is near the detector surface. We were able to overcome such tangential resolution deterioration by attaching an acoustic concave lens, made of acrylic in front of the flat detector surface. We then quantified the tangential resolution improvement using phantom images. We also showed that the use of the negative lens preserves the shape of an object after the image is reconstructed.
KW - negative acoustic lens
KW - photoacoustic tomography
KW - tangential resolution
KW - thermoacoustic tomography
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U2 - 10.1117/1.3103778
DO - 10.1117/1.3103778
M3 - Article
C2 - 19405757
AN - SCOPUS:67650308512
SN - 1083-3668
VL - 14
JO - Journal of biomedical optics
JF - Journal of biomedical optics
IS - 2
M1 - 024028
ER -