dc.contributor.author | Rao, Navalgund | en_US |
dc.date.accessioned | 2006-12-18T18:25:19Z | en_US |
dc.date.available | 2006-12-18T18:25:19Z | en_US |
dc.date.issued | 1994-03 | en_US |
dc.identifier.citation | Journal of Medical and Biological Engineering and Computing 32N2 (1994) 181-188 | en_US |
dc.identifier.issn | 1741-0444 | en_US |
dc.identifier.uri | http://hdl.handle.net/1850/3213 | en_US |
dc.description | RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/ | |
dc.description.abstract | Pulse compression techniques that are capable of producing a large signal-to-noise (SNR) enhancement, have been used successfully in many different fields. For medical applications, frequency-dependent attenuation in soft tissue can limit the usefulness of this method. In the paper, this issue is examined through model-simulation studies. Frequency-modulation (FM) chirp, considered in the study, is just one form of pulse coding technique. Pulse propagation effects in soft tissue are modelled as a linear zero phase filter. A method to perform simulations and estimate the effective time-bandwidth product K is outlined. K describes the SNR enhancement attainable under limitations imposed by the soft-tissue medium. An effective time-bandwidth product is evaluated as a function of soft-tissue linear attenuation coefficient αo, scatterer depth z and the bandwidth of the interrogating FM pulse, under realistic conditions. Results indicate that, under certain conditions, K can be significantly lower than its expected value in a non-attenuating medium. It is argued that although limitations exist, pulse compression techniques can still be used to improve resolution or increase penetrational depth. The real advantage over conventional short-pulse imaging comes from the possibility that these improvements can be accomplished without increasing the peak intensity of the interrogating pulse above any threshold levels set by possible bio-effect considerations. | en_US |
dc.format.extent | 68858 bytes | en_US |
dc.format.mimetype | application/pdf | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Springer Berlin / Heidelberg | en_US |
dc.relation.ispartofseries | vol. 32 | en_US |
dc.relation.ispartofseries | no. 2 | en_US |
dc.subject | Pulse compression | en_US |
dc.subject | Signal-to-noise | en_US |
dc.subject | Ultrasonic imaging | en_US |
dc.title | Investigation of a pulse compression technique for medical ultrasound: a simulation study | en_US |
dc.type | Article | en_US |
dc.identifier.url | http://dx.doi.org/10.1007/BF02518916 | |