Harmonic chirp imaging method for ultrasound contrast agent

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Borsboom, Jerome M.G. and Chin, Chien Ting and Bouakaz, Ayache and Versluis, Michel and Jong, Nico de (2005) Harmonic chirp imaging method for ultrasound contrast agent. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 52 (2). pp. 241-249. ISSN 0885-3010

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Abstract:Coded excitation is currently used in medical ultrasound to increase signal-to-noise ratio (SNR) and penetration depth. We propose a chirp excitation method
for contrast agents using the second harmonic component of the response. This method is based on a compression filter that selectively compresses and extracts the second harmonic component from the received echo signal. Simulations have shown a clear increase in response for chirp excitation
over pulse excitation with the same peak amplitude. This was confirmed by two-dimensional (2-D) optical observations of bubble response with a fast framing camera. To evaluate the harmonic compression method, we applied it to
simulated bubble echoes, to measured propagation harmonics, and to B-mode scans of a flow phantom and compared it to regular pulse excitation imaging. An increase of approximately 10 dB in SNR was found for chirp excitation. The
compression method was found to perform well in terms of resolution. Axial resolution was in all cases within 10% of the axial resolution from pulse excitation. Range side-lobe levels were 30 dB below the main lobe for the simulated bubble echoes and measured propagation harmonics. However,
side-lobes were visible in the B-mode contrast images.
Item Type:Article
Copyright:© 2005 IEEE
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/54373
Official URL:http://dx.doi.org/10.1109/TUFFC.2005.1406550
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