Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-09-12
2006-09-12
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C600S443000, C600S447000
Reexamination Certificate
active
07105981
ABSTRACT:
Methods and systems are provided for controlling the transmit spectrum in medical imaging. A combination of different delays and/or sign changes are used control the spectrum. The different delays and/or sign changes are applied across the transmit aperture. For example, a repeating pattern of three different delays in addition to focusing delays is provided, such as no additional delay, a quarter cycle advance and a quarter cycle delay. As another example, a repeating pattern is applied where one waveform has an additional delay and a sign change. The use of three or more different amounts of delay in addition to focusing delays and/or the use of delay and sign change may be used in simple unipolar or bipolar transmitters or in more complex transmitters. For example, delay is implemented with a phase shift. The combinations of delays, phase shifts and sign changes is selected to cause acoustic summation along the transmit beam with desired spectral content. By summing the waveforms in the acoustic domain, a more desired spectral content than available for any given transmit waveform is provided. For example, harmonic, second harmonic, odd harmonics, even harmonics or any other frequency bands may be suppressed.
REFERENCES:
patent: 5549111 (1996-08-01), Wright et al.
patent: 5675554 (1997-10-01), Cole et al.
patent: 5833614 (1998-11-01), Dodd et al.
patent: 5913823 (1999-06-01), Hedberg et al.
patent: 6132375 (2000-10-01), Napolitano
patent: 6193659 (2001-02-01), Ramamurthy et al.
patent: 6193663 (2001-02-01), Napolitano et al.
patent: 6221018 (2001-04-01), Ramamurthy et al.
patent: 6312379 (2001-11-01), Bradley et al.
patent: 6436046 (2002-08-01), Napolitano et al.
patent: 6443897 (2002-09-01), Dubberstein et al.
patent: 6679846 (2004-01-01), Napolitano et al.
patent: 6806623 (2004-10-01), Petersen et al.
“Transmit Aperture Processing for Nonlinear Contrast Agent Imaging,” by S. Krishnan and M. O'Donnell; Electrical Engineering and Computer Science Department and Bioengineering Program, University of Michigan, Ann Arbor, Michigan; Ultrasonic Imaging 18, 77-105 (1996), Article No. 0005; Copyright 1996 by the Academic Press, Inc.
Dougherty Thomas M.
Siemens Medical Solutions USA , Inc.
LandOfFree
Medical imaging transmit spectral control using aperture... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Medical imaging transmit spectral control using aperture..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Medical imaging transmit spectral control using aperture... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3561074