Frequency modulated pulse for ultrasonic imaging in an attenuating medium

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dc.contributor.author Rao, Navalgund en_US
dc.date.accessioned 2006-12-18T18:27:08Z en_US
dc.date.available 2006-12-18T18:27:08Z en_US
dc.date.issued 1990-06-03 en_US
dc.identifier.citation Proceedings of the 3rd Annual IEEE Symposium on Computer-based Medical Systems (1990) 89-96 en_US
dc.identifier.isbn 0-8186-9040-2 en_US
dc.identifier.uri http://hdl.handle.net/1850/3223 en_US
dc.description "Frequency modulated pulse for ultrasonic imaging in an attenuating medium," Proceedings of the 3rd Annual IEEE Symposium on Computer-based Medical Systems. The Institute of Electrical and Electronics Engineers. Held in Chapel Hill, North Carolina: 3-6 June 1990. ©1990 Institute of Electrical and Electronics Engineers (IEEE). Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. en_US
dc.description.abstract It is argued that the probability that ultrasound used at the intensities employed clinically will cause bioeffects characteristic of transient cavitation is immensely greater above a threshold peak intensity of the interrogating ultrasound pulse. Simulations and experiments in nonattenuating media show that a factor of 16 to 50 reduction in peak intensity is possible without sacrificing the signal primarily used for imaging, or the resolution. This factor depends on the effective time-bandwidth product of the frequency modulated pulse. However, in a frequency-dependent attenuating medium, such as soft tissue, this advantage could diminish. A linear-frequency and linear-phase model for attenuation was incorporated in the simulation process. The time-bandwidth product was evaluated for reflectors at various depths and as a function of the center frequency and bandwidth of the frequency-modulated pulse. en_US
dc.description.sponsorship This work was supported in part by American Heart Association grant-in-aid award N. 881095. I would like to acknowledge help of Sumat Mehra in performing some of the simulations. en_US
dc.format.extent 375984 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher The Institute of Electrical and Electronics Engineers (IEEE) en_US
dc.subject Acoustic imaging en_US
dc.subject Biomedical ultrasonics en_US
dc.subject Patient diagnosis en_US
dc.title Frequency modulated pulse for ultrasonic imaging in an attenuating medium en_US
dc.type Proceedings en_US

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