TY - JOUR
T1 - Real-Time Coded Excitation Imaging Using a CMUT-based Side Looking Array for Intravascular Ultrasound
AU - Zangabad, Reza Pakdaman
AU - Bosch, Johan G.
AU - Mastik, Frits
AU - Beurskens, Robert H.S.H.
AU - Henneken, Vincent A.
AU - Weekamp, Johannes W.
AU - van der Steen, Antonius F.W.
AU - van Soest, Gijs
PY - 2021
Y1 - 2021
N2 - Intravascular ultrasound (IVUS) is a well-established diagnostic method that provides images of the vessel wall and atherosclerotic plaques. We investigate the potential for phased-array IVUS utilizing coded excitation (CE) for improving the penetration depth and image signal-to-noise ratio (SNR). It is realized on a new experimental broadband capacitive micromachined ultrasound transducer (CMUT) array, operated in collapse mode, with 96 elements placed at the circumference of a catheter tip with a 1.2- {mm} diameter. We characterized the array performance for CE imaging and showed that the -6-dB device bandwidth at a 30-V dc biasing is 25 MHz with a 20-MHz center frequency, with a transmit sensitivity of 37 kPa/V at that frequency. We designed a linear frequency modulation code to improve penetration depth by compensating for high-frequency attenuation while preserving resolution by a mismatched filter reconstruction. We imaged a wire phantom and a human coronary artery plaque. By assessing the image quality of the reconstructed wire phantom image, we achieved 60- and 70- mu{mathrm {m}} axial resolutions using the short pulse and coded signal, respectively, and gained 8 dB in SNR for CE. Our developed system shows 20-frames/s, pixel-based beam-formed, real-time IVUS images.
AB - Intravascular ultrasound (IVUS) is a well-established diagnostic method that provides images of the vessel wall and atherosclerotic plaques. We investigate the potential for phased-array IVUS utilizing coded excitation (CE) for improving the penetration depth and image signal-to-noise ratio (SNR). It is realized on a new experimental broadband capacitive micromachined ultrasound transducer (CMUT) array, operated in collapse mode, with 96 elements placed at the circumference of a catheter tip with a 1.2- {mm} diameter. We characterized the array performance for CE imaging and showed that the -6-dB device bandwidth at a 30-V dc biasing is 25 MHz with a 20-MHz center frequency, with a transmit sensitivity of 37 kPa/V at that frequency. We designed a linear frequency modulation code to improve penetration depth by compensating for high-frequency attenuation while preserving resolution by a mismatched filter reconstruction. We imaged a wire phantom and a human coronary artery plaque. By assessing the image quality of the reconstructed wire phantom image, we achieved 60- and 70- mu{mathrm {m}} axial resolutions using the short pulse and coded signal, respectively, and gained 8 dB in SNR for CE. Our developed system shows 20-frames/s, pixel-based beam-formed, real-time IVUS images.
KW - Atherosclerotic plaque
KW - capacitive micromachined ultrasound transducer (CMUT)
KW - coded excitation (CE)
KW - coronary heart disease
KW - intravascular ultrasound (IVUS)
KW - mismatched filtering
KW - pixel-based beam-forming
UR - http://www.scopus.com/inward/record.url?scp=85100489310&partnerID=8YFLogxK
U2 - 10.1109/TUFFC.2021.3054971
DO - 10.1109/TUFFC.2021.3054971
M3 - Article
AN - SCOPUS:85100489310
SN - 0885-3010
VL - 68
SP - 2048
EP - 2058
JO - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
IS - 6
M1 - 9336716
ER -