Print Email Facebook Twitter Feasibility study of superharmonic imaging using chirps Title Feasibility study of superharmonic imaging using chirps Author Van Neer, P. Danilouchkine, M.G. Matte, G. Voormolen, M.M. Verweij, M.D. De Jong, N. Faculty Applied Sciences Department IST/Imaging Science and Technology Date 2010-04-28 Abstract Superharmonic imaging (SHI) targets a combination of the 3rd to 5th harmonics. It was proven to have certain advantages in comparison with the established imaging standards in medical utrasound. SHI enhances the spatial resolution and improves the quality of echographic images, mainly by eliminating reverberation artifacts at the chest wall. However, SHI suffers from ripple artifacts, originating from the spectral gaps in between harmonics, and degrading the temporal resolution. To solve this a chirp-based SHI protocol was employed and its characteristics investigated, i.e. point spread function (PSF). The protocol was implemented for an interleaved phased array probe (44+44 elements tuned at 1.0+3.7MHz), connected to a fully programmable ultrasound system. A linear chirp (center frequency 1MHz; bandwidth 40%) was used for excitation. To obtain the PSF, the RF traces were recorded at focus along the lateral axis and convolved with the decoding signal. This was computed using KZK simulations. A PSF comparison between a superharmonic chirp and the 3rd-harmonic of a 2.5-cycle Gaussian apodized sinus burst at 1MHz showed a decrease in axial pulse length of 46% at -6dB and 32% at the -20dB level in favor of SHI. Chirp based SHI is virtually free of ripple artifacts and therefore feasible. To reference this document use: http://resolver.tudelft.nl/uuid:d5d68cbf-e259-467d-aac3-5dbe9321a5df DOI https://doi.org/10.1121/1.3430889 Publisher Acoustical Society of America ISSN 1939-800X Source Proceedings of Meetings on Acoustics, 9, 2010: 159th Meeting Acoustical Society of America/NOISE-CON 2010, Baltimore, USA, 19-23 April 2010 Part of collection Institutional Repository Document type conference paper Rights © 2010 The Author(s)Acoustical Society of America Files PDF Verweij.pdf 343.28 KB Close viewer /islandora/object/uuid:d5d68cbf-e259-467d-aac3-5dbe9321a5df/datastream/OBJ/view