oped. The acoustic stack for the angled-focused transducer was made of PMN-PT single crystal with one
matching layer, one protective coating layer, and a highly damped backing layer.It was then press-focused
to a desired focal length and inserted into a thin needle housing with an angled tip. A transducer with an
angled and unfocused aperture was also made, following the same fabrication procedure, to compare the
performance ofthe two transducers. The focused and unfocused transducers were tested to measure their
center frequencies, bandwidths, and spatial resolutions. Lateral resolution of the angled-focused transducer
(AFT) improved more than two times compared to that of the angled-unfocused transducer (AUT).
A tissue-mimicking phantom in water and a rabbit aorta tissue sample in rabbit blood were scanned
using AFT and AUT. Imaging with AFT offered improved contrast, over imaging with AUT, of the tissuemimicking
phantom and the rabbit aorta tissue sample by 23 dB and 8 dB, respectively. The results show
that AFT has strong potential to provide morphological and pathological information of coronary arteries
with high resolution and high contrast
oped. The acoustic stack for the angled-focused transducer was made of PMN-PT single crystal with onematching layer, one protective coating layer, and a highly damped backing layer.It was then press-focusedto a desired focal length and inserted into a thin needle housing with an angled tip. A transducer with anangled and unfocused aperture was also made, following the same fabrication procedure, to compare theperformance ofthe two transducers. The focused and unfocused transducers were tested to measure theircenter frequencies, bandwidths, and spatial resolutions. Lateral resolution of the angled-focused transducer(AFT) improved more than two times compared to that of the angled-unfocused transducer (AUT).A tissue-mimicking phantom in water and a rabbit aorta tissue sample in rabbit blood were scannedusing AFT and AUT. Imaging with AFT offered improved contrast, over imaging with AUT, of the tissuemimickingphantom and the rabbit aorta tissue sample by 23 dB and 8 dB, respectively. The results showthat AFT has strong potential to provide morphological and pathological information of coronary arterieswith high resolution and high contrast
การแปล กรุณารอสักครู่..
