The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 2006
Filed:
Dec. 10, 2003
John C. Lazenby, Fall City, WA (US);
John C. Lazenby, Fall City, WA (US);
Siemens Medical Solutions USA, Inc., Malvern, PA (US);
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.