13 April 2015 Dual-element needle transducer for intravascular ultrasound imaging
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A dual-element needle transducer for intravascular ultrasound imaging has been developed. A low-frequency element and a high-frequency element were integrated into one device to obtain images which conveyed both low- and high-frequency information from a single scan. The low-frequency element with a center frequency of 48 MHz was fabricated from the single crystal form of lead magnesium niobate-lead titanate solid solution with two matching layers (MLs) and the high frequency element with a center frequency of 152 MHz was fabricated from lithium niobate with one ML. The measured axial and lateral resolutions were 27 and 122  μm, respectively, for the low-frequency element, and 14 and 40  μm, respectively, for the high-frequency element. The performance of the dual-element needle transducer was validated by imaging a tissue-mimicking phantom with lesion-mimicking area, and ex vivo rabbit aortas in water and rabbit whole blood. The results suggest that a low-frequency element effectively provides depth resolved images of the whole vessel and its adjacent tissue, and a high-frequency element visualizes detailed structure near the surface of the lumen wall in the presence of blood within the lumen. The advantages of a dual-element approach for intravascular imaging are also discussed.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Sangpil Yoon, Sangpil Yoon, Min Gon Kim, Min Gon Kim, Jay A. Williams, Jay A. Williams, Changhan Yoon, Changhan Yoon, Bong Jin Kang, Bong Jin Kang, Nestor Cabrera-Munoz, Nestor Cabrera-Munoz, K. Kirk Shung, K. Kirk Shung, Hyung Ham Kim, Hyung Ham Kim, } "Dual-element needle transducer for intravascular ultrasound imaging," Journal of Medical Imaging 2(2), 027001 (13 April 2015). https://doi.org/10.1117/1.JMI.2.2.027001 . Submission:

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