US5856955A
Expired / Lapsed
US
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Method and apparatus for transmit beamformer system
Assignee: Siemens Medical Solutions USA Inc
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Filing: 1997-07-10
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Granted: 1999-01-05
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Expires: 2017-07-10
Abstract
Abstract A digital transmit beamformer system with multiple beam transmit capability has a plurality of multi-channel transmitters, each channel with a source of sampled, complex-valued initial waveform information representative of the ultimate desired waveform to be applied to one or more corresponding transducer elements for each beam. Each multi-channel transmitter applies beamformation delays and apodization to each channel's respective initial waveform information digitally, digitally modulates the information by a carrier frequency, and interpolates the information to the DAC sample rate for conversion to an analog signal and application to the associated transducer element(s). The beamformer transmitters can be programmed per channel and per beam with carrier frequency, delay, apodization and calibration values. For pulsed wave operation, pulse waveform parameters can be specified to the beamformer transmitters on a per firing basis, without degrading the scan frame rate to non-useful diagnostic levels. Waveform parameters can be specified to the transmitters by an external central control system which is responsible for higher level flexibility, such as scan formats, focusing depths and fields of view. The transmit pulse delay specified per-channel to each transmitter is applied in at least two components: a focusing time delay component and a focusing phase component. The carrier frequency can be specified for each transmit beam, to any desired frequency within a substantially continuous predefined range of frequencies, and a beam-interleaved signal processing path permits operation in any of several predefined processing modes, which define different parameter sets in a trade-off among (1) the number of beams produced; (2) per-beam waveform sample interval; and (3) transmit frequency.
Inventors
- 👤 Christopher R. Cole
- 👤 Albert Gee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:03
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8979; G01S15/8988; G01S15/8909; G01S15/8915; G01S7/00; G01S7/52; G01S7/52017; G01S7/52019; G01S7/52023; G01S7/52025; G01S7/52026; G01S7/52046; G01S7/52053; G01S7/52057; G01S7/5206; G01S7/52066; G01S7/52085; G01S7/5209; G01S7/52095; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/34; G10K11/341; G10K11/345; G01S7/52049
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
74 words
A method for transmitting ultrasonic waveforms from an ultrasound system, the method comprising the steps of: (a) transmitting at least first and second beams substantially simultaneously along a first scan line, the first and second beams associated with a substantially same transmit center frequency; and (b) focusing the first beam at a first focal depth and the second beam at a second focal depth, the second focal depth different than the first focal depth.
Claim 2
Independent Claim
74 words
A method for transmitting ultrasonic waveforms from an ultrasound system, the method comprising the steps of: (a) transmitting at least first and second beams substantially simultaneously along a first scan line, the first and second beams associated with a substantially same transmit center frequency; and (b) focusing the first beam at a first focal depth and the second beam at a second focal depth, the second focal depth different than the first focal depth.
Claim 3
Dependent Claim
23 words
The method of claim 1 further comprising the step of (c) repeating the steps (a) and (b) for a plurality of scan lines.
Claim 4
Dependent Claim
35 words
The method of claim 1 further comprising the steps of: (c) transmitting at least a third beam substantially simultaneously along the first scan line; and (d) focusing the third beam at a third focal depth.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein the step (a) comprises generating first and second electrical signals for each transducer element in first and second pluralities of transducer elements, respectively.
Claim 6
Dependent Claim
38 words
The method of claim 4 wherein the step (a) comprises transmitting a superposition of the first and second electrical signals for each of the transducer elements, the first plurality comprising the same transducer elements as the second plurality.
Claim 7
Dependent Claim
26 words
The method of claim 5 wherein the step (b) comprises applying a different apodization function across the transducer elements for the first and second electrical signals.
Claim 8
Dependent Claim
26 words
The method of claim 5 wherein the step (b) comprises applying a different delay function across the transducer elements for the first and second electrical signals.
Claim 9
Dependent Claim
127 words
The method of claim 4 wherein the step (a) comprises: providing to a signal path associated with each transducer element initial waveform samples; and applying to an ultrasonic transducer comprising the transducer elements output waveforms responsive to said initial waveform samples, said method further comprising, prior to said step of applying, at least one of: the step of modulating by a desired frequency samples in said signal path, the step of upsampling samples in said signal path, the step of interpolating samples in said signal path, the step of time delaying by a time delay samples in said signal path, the step of focus filtering with a filter samples in said signal path, and the step of phase rotating by a phase samples in said signal path.
Claim 10
Dependent Claim
56 words
The method of claim 5 wherein the step (a) comprises: (a1) interleaving the first and second electrical signals in first parts of a plurality of channels, each channel associated with a respective one of the transducer elements; and (a2) superposing the first and second electrical signals in second parts of each of the plurality of channels.
Claim 11
Dependent Claim
25 words
The method of claim 1 wherein the step (a) comprises transmitting N B beams associated with a transmit signal nominal center frequency F 0 .
Claim 12
Dependent Claim
100 words
An ultrasound beamformer apparatus for transmitting ultrasonic waveforms, the apparatus comprising: first and second sources of first and second initial waveform samples, respectively, for an output waveform; a transducer comprising a plurality of transducer elements; and a plurality of signal paths coupled between each of said first and second sources and the plurality of transducer elements; wherein the transducer and signal paths are operative to transmit along a scan line substantially simultaneous first and second beams corresponding to the output waveform, the first and second beams associated with a substantially same transmit center frequency and focused at different focal depths.
Claim 13
Dependent Claim
100 words
An ultrasound beamformer apparatus for transmitting ultrasonic waveforms, the apparatus comprising: first and second sources of first and second initial waveform samples, respectively, for an output waveform; a transducer comprising a plurality of transducer elements; and a plurality of signal paths coupled between each of said first and second sources and the plurality of transducer elements; wherein the transducer and signal paths are operative to transmit along a scan line substantially simultaneous first and second beams corresponding to the output waveform, the first and second beams associated with a substantially same transmit center frequency and focused at different focal depths.
Claim 14
Dependent Claim
41 words
The apparatus of claim 11 wherein at least a first signal path of said plurality of signal paths including at least one of the following elements: an upsampler, an interpolator, a modulator, a time delay element, and a phase rotation element.
Claim 15
Dependent Claim
70 words
Apparatus according to claim 1, wherein said first signal path includes a digital-to-analog converter having an input sample rate F s , wherein said first output waveform has an associated carrier frequency F c approximately equal to a factor v times a nominal center frequency F 0 , and wherein F 0 is specifiable to said first signal path from a predetermined plurality of available fractions of F s .
Claim 16
Dependent Claim
82 words
Apparatus according to claim 13, wherein said initial waveform samples occur at regular discrete times at a rate R E , wherein said first signal path comprises: said modulator, said modulator modulating samples in said first signal path by a desired frequency; and said upsampler, said upsampler, preceding said modulator and said upsampler increasing the sample rate of samples in said first signal path by a factor n=4F 0 /R E , where n is a specifiable integer no less than 1.
Claim 17
Dependent Claim
177 words
Apparatus according to claim 1, wherein said initial waveform samples define at least one of a plurality N B of first signal path waveforms to produce said first output waveform, wherein the initial waveform samples associated with the j'th one of said first signal path waveforms is produced in said first output waveform with a respective carrier frequency equal to a respective factor v j times a common nominal center frequency F 0 , wherein each of said first signal path waveforms is specified at a rate R E , and wherein said first signal path is specifiable to operate in one of a plurality of processing modes defining a respective parameter set comprising at least (1) the maximum number N B of said first signal path waveforms which said first signal path can superpose to produce said first output waveform, (2) F 0 , and (3) a nominal-center-frequency-normalized initial waveform sample rate R E /F 0 , said processing modes reflecting a trade-off among N B , F 0 , and R E /F 0 .
Claim 18
Dependent Claim
84 words
The apparatus of claim 1 wherein a time delay in said first signal path has a portion representing a coarse time delay, a portion representing a fine time delay, and a portion representing a residual delay, and further wherein said first signal path includes a first time delay element that applies the coarse time delay portion, a second time delay element that applies the fine time delay portion, and a phase rotation element that applies the residual time delay portion as a phase rotation.
Claim 19
Dependent Claim
76 words
The apparatus of claim 1 wherein the first signal path comprises a first modulator and a second modulator, and wherein said first modulator modulates samples in said first signal path by a nominal center frequency F 0 , and said second modulator modulates samples in said first signal path by a vernier frequency ranging between -F 0 and F 0 to produce output waveform samples with a resultant carrier frequency between 0 and 2F 0 .
Claim 20
Dependent Claim
46 words
The apparatus of claim 17 wherein at least one of the plurality of signal paths comprises: said first source of initial waveform samples a digital signal processing path; a DAC coupled to said digital signal processing path; and an output signal path coupled to said DAC.
Claim 21
Dependent Claim
195 words
Apparatus according to claim 18, wherein said first source of initial waveform samples comprises one of the group consisting of (I)(a) a memory containing said first initial waveform samples, (b) in combination, (1) a memory containing said first initial waveform samples and having data output coupled to said digital signal processing path, said memory further having an address input, and (2) a counter having an output coupled to said address input of said memory, (c) a source of an impulse coupled to a waveshaping filter in said digital signal processing path, and (d) means for computing said first initial waveform samples sequentially and providing the first initial waveform samples sequentially to said digital signal processing path; and wherein said digital signal processing path includes at least one of the following: (II)(a) an upsampler, (b) an interpolator, (c) a modulator, (d) a time delay element, (e) a phase rotation element, (f) an apodization multiplier, (g) an encoder which provides to said DAC samples from said digital signal path in encoded form, (h) a filter, and (i) means for time delaying samples in said digital signal path by creating interpolated samples which approximate a desired time delay.
Claim 22
Independent Claim
95 words
A method for transmitting ultrasonic waveforms from an ultrasound system, the method comprising the steps of: (a) summing first and second waveforms corresponding to first and second beams, respectively; (b) applying the summed first and second waveforms to a transducer; (c) transmitting in response to step (b) at least the first and second beams substantially simultaneously along first and second scan lines, the first and second beams associated with a substantially same transmit center frequency; and (d) focusing the first beam at a first focal depth and the second beam at a second focal depth.
Claim 23
Independent Claim
95 words
A method for transmitting ultrasonic waveforms from an ultrasound system, the method comprising the steps of: (a) summing first and second waveforms corresponding to first and second beams, respectively; (b) applying the summed first and second waveforms to a transducer; (c) transmitting in response to step (b) at least the first and second beams substantially simultaneously along first and second scan lines, the first and second beams associated with a substantially same transmit center frequency; and (d) focusing the first beam at a first focal depth and the second beam at a second focal depth.
References Cited (Backward Citations)
US4234940A
Cited
US4207772A
Cited
US4140022A
Cited
US4140022B1
Cited
US4155258A
Cited
WO1980000497A1
Cited
US4470308A
Cited
US4456982A
Cited
WO1983002330A1
Cited
EP0104928A2
Cited
US4534221A
Cited
US4545250A
Cited
US4549533A
Cited
US4550607A
Cited
US4699009A
Cited
US4779622A
Cited
US4881190A
Cited
USRE33816E
Cited
US4809184A
Cited
US4815043A
Cited
US4839652A
Cited
EP0302554A1
Cited
US4870971A
Cited
WO1989005122A1
Cited
US4886069A
Cited
US4949312A
Cited
US4949313A
Cited
US4893284A
Cited
US4896287A
Cited
US5005419A
Cited
US5027821A
Cited
US5014710A
Cited
US5165413A
Cited
US4975885A
Cited
US4965602A
Cited
US5014712A
Cited
US4983970A
Cited
US5047769A
Cited
US5047770A
Cited
US5113706A
Cited
US5111695A
Cited
US5123415A
Cited
US5105814A
Cited
US5228007A
Cited
US5183048A
Cited
US5142649A
Cited
US5121364A
Cited
US5235982A
Cited
US5431053A
Cited
US5276654A
Cited
US5172343A
Cited
US5465722A
Cited
US5269309A
Cited
US5203335A
Cited
US5301674A
Cited
US5230340A
Cited
US5353797A
Cited
US5249578A
Cited
US5387180A
Cited
US5329930A
Cited
US5517996A
Cited
US5551433A
Cited
US5675554A
Cited
US5608690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-04 | 2002-07-06 | 2003-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-04 | 2006-07-06 | 2007-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-04 | 2010-07-06 | 2011-01-05 | $7700.00 | Window Closed / Lapsed |