| Literature DB >> 17112951 |
Martijn E Frijlink1, David E Goertz, Hendrik J Vos, Erik Tesselaar, Gerrit Blacquière, Andries Gisolf, Rob Krams, Antonius F W van der Steen.
Abstract
Recent studies have shown the feasibility of tissue and contrast harmonic imaging with a prototype nonlinear intravascular ultrasound (IVUS) system using a conventional single-element rotating IVUS catheter. In this study, a dual-frequency transducer element was mounted in an IVUS catheter and its second harmonic imaging performance was investigated and compared with that of a conventional IVUS catheter. Hydrophone measurements showed a transmit efficiency improvement of >6 dB for the dual-frequency catheter at 20 MHz. In vitro phantom experiments showed a signal-to noise ratio improvement of >5 dB in second harmonic mode at 40 MHz (H40) with the dual-frequency catheter, when using equal transmit voltage for both catheters. Finally, in vivo experiments were conducted and showed image improvement in H40 acquisitions with respect to the conventional IVUS catheter.Mesh:
Year: 2006 PMID: 17112951 DOI: 10.1016/j.ultrasmedbio.2006.05.024
Source DB: PubMed Journal: Ultrasound Med Biol ISSN: 0301-5629 Impact factor: 2.998