Print Email Facebook Twitter Real-Time Coded Excitation Imaging Using a CMUT-based Side Looking Array for Intravascular Ultrasound Title Real-Time Coded Excitation Imaging Using a CMUT-based Side Looking Array for Intravascular Ultrasound Author Zangabad, Reza Pakdaman (Erasmus MC) Bosch, Johan G. (Erasmus MC) Mastik, Frits (Erasmus MC) Beurskens, Robert H.S.H. (Erasmus MC) Henneken, Vincent A. (Philips Research) Weekamp, Johannes W. (Philips Research) van der Steen, A.F.W. (TU Delft ImPhys/Medical Imaging; Erasmus MC; Philips Research) van Soest, Gijs (Erasmus MC) Date 2021 Abstract 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. Subject Atherosclerotic plaquecapacitive micromachined ultrasound transducer (CMUT)coded excitation (CE)coronary heart diseaseintravascular ultrasound (IVUS)mismatched filteringpixel-based beam-forming To reference this document use: http://resolver.tudelft.nl/uuid:968cf3c4-5b50-4e76-a5c0-b8b2f4cde20a DOI https://doi.org/10.1109/TUFFC.2021.3054971 ISSN 0885-3010 Source IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 68 (6), 2048-2058 Part of collection Institutional Repository Document type journal article Rights © 2021 Reza Pakdaman Zangabad, Johan G. Bosch, Frits Mastik, Robert H.S.H. Beurskens, Vincent A. Henneken, Johannes W. Weekamp, A.F.W. van der Steen, Gijs van Soest Files PDF 09336716.pdf 23.09 MB Close viewer /islandora/object/uuid:968cf3c4-5b50-4e76-a5c0-b8b2f4cde20a/datastream/OBJ/view