Browsing Meeting minutes, announcements and publications from RIT Colleges by Author "Rao, Navalgund"
Now showing items 1-9 of 9
-
Combining pulse compression and adaptive drive signal design to inverse filter the transducer system response and improve resolution in medical ultrasound
Venkatraman, Shyam; Rao, Navalgund (Springer Berlin/Heidelberg, 1996-07)An adaptive inverse filtering technique has been incorporated into a medical ultrasound B-scan scheme that used a linear frequency modulated pulse for imaging. Resolution improvement is demonstrated with imaging experiments ... -
Experimental investigation of the resistance in thin superconducting films of niobium-germanium
Rao, Navalgund; Dahlberg, E. Dan; Goldman, Allen; Toth, Louis; Umbach, Corwin (American Institute of Physics, 1980-01-15)We discuss the resistance of thin superconducting films of amorphous niobium-germanium below the BCS thermodynamic transition temperature as determined by measurements of the heat capacity. This resistance is shown to be ... -
Experimental point spread function of FM pulse imaging scheme
Rao, Navalgund; Mehra, Sumat; Bridges, J.; Venkatraman, S. (Elsevier, 1995)In this paper, we have examined the possibility of incorporating pulse compression techniques into a conventional medical B-scan imaging scheme. Linear frequency modulation fm, one form of pulse coding among many others, ... -
Investigation of a pulse compression technique for medical ultrasound: a simulation study
Rao, Navalgund (Springer Berlin / Heidelberg, 1994-03)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 ... -
On Understanding the relationship between ultrasound speckle and the scattering microstructure
Rao, Navalgund; Venkataraman, S.; Helguera, Maria (Acoustical Imaging, 1997)Recent studies on the statistics of the envelope of the ultrasound echo signal from a random scattering medium suggest that the statistical moments of the signal may carry quantitative information about the scattering ... -
Pulse coding in medical ultrasound: Some possible applications
Rao, Navalgund; Yang, D.; Raman, R.; Chandaroy, P.; Venkatraman, S. (Acoustical Imaging, 1995)Pulse coding and pulse compression techniques have been used extensively in radar, sonar, non-destructive testing and seismic imaging1-4. Its application in medical imaging has been sparse and few5-8. Possible reasons ... -
Simulation study of changes in ultrasound speckle statistics with the system point spread function
Rao, Navalgund; Aubry, W. (Journal of the Acoustical Society of America, 1994)The intensity point signal-to-noise ratio, SNRI, characterizing the ultrasound speckle statistics, depends on the tissue scattering microstructure and the imaging systems point spread function. Both should be described in ... -
Spatial averaging in the beam of a piston transducer
Daly, Charles; Rao, Navalgund (Elsevier Science, 2001-05)This paper presents a theoretical analysis of the spatially averaged free-field responses of phase-sensitive and phase-insensitive receivers centered in the beam of a harmonically excited piston transmitter. The responses ... -
Time- and frequency-domain descriptions of spatially averaged one-way diffraction for an unfocused piston transducer
Daly, Charles; Rao, Navalgund (Elsevier Science, 1999-03)Time-domain and frequency-domain expressions describing spatially averaged effects of one-way diffraction in the case of an unfocused piston transmitter and finite receiver are of theoretical and practical interest. Here, ...