Method and apparatus for doppler receive beamformer system
First Claim
1. Apparatus for processing a plurality of input signals each responsive to ultrasonic energy incident on a respective ultrasonic receive element in an array, comprising:
- a plurality of range gates each coupled to range gate a respective one of said input signals;
a plurality of focusing phase-rotators each coupled to phase-rotate a respective one of said input signals; and
a summer coupled to sum signals responsive to said gated, phase-rotated signals to produce a summed signal;
a demodulator demodulating a signal responsive to at least one of said input signals;
an integrator, downstream of said demodulator, said integrator integrating a signal responsive to said summed signal to produce an output value;
means for operating said apparatus in a first mode (PW), in which each of said range gates is enabled only during selected time periods; and
means for operating said apparatus in a second mode (CW), in which said range gates are enabled continuously.
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Accused Products
Abstract
An ultrasonic receive system includes two receive beamformers. A first receive beamformer is optimized for imaging modes such as B-mode and color Doppler flow imaging, and therefore has high spatial resolution and wide bandwidth, while the accompanying second receive beamformer has a wide dynamic range and is dedicated for use in acquiring spectral Doppler information, which is typically narrowband compared to imaging information. The second receive beamformer achieves the sensitivity and low-noise performance of a dedicated single-channel pencil probe instrument yet it also performs electronic beam steering. Both receive beamformers can operate through a common transducer array, thereby increasing exam efficiency and permitting registration of spectral Doppler information with a B-mode or color Doppler flow image.
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Citations
116 Claims
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1. Apparatus for processing a plurality of input signals each responsive to ultrasonic energy incident on a respective ultrasonic receive element in an array, comprising:
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a plurality of range gates each coupled to range gate a respective one of said input signals; a plurality of focusing phase-rotators each coupled to phase-rotate a respective one of said input signals; and a summer coupled to sum signals responsive to said gated, phase-rotated signals to produce a summed signal; a demodulator demodulating a signal responsive to at least one of said input signals; an integrator, downstream of said demodulator, said integrator integrating a signal responsive to said summed signal to produce an output value; means for operating said apparatus in a first mode (PW), in which each of said range gates is enabled only during selected time periods; and means for operating said apparatus in a second mode (CW), in which said range gates are enabled continuously. - View Dependent Claims (2, 3)
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4. A method for processing ultrasonic energy incident on a plurality of ultrasonic transducers by phase-rotating an analog input signal by a desired phase rotation, comprising the steps of:
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providing said analog input signal as a plurality of phase-split signals; weighting at least one of said phase-split signals by a plurality of different fixed weights to produce a plurality of weighted, phase-split signals; and summing selected ones of said weighted, phase-split signals, said selection being made in response to said desired phase rotation. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 113)
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12. A method for processing ultrasonic energy incident on a plurality of ultrasonic transducers by phase-rotating an analog input signal by a desired one of a predefined set of available discrete amounts, comprising the steps of:
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providing said analog input signal as two input phase-split signals in substantial quadrature; weighting each of said input phase-split signals to produce a respective plurality of weighted phase-split signals for each of said input phase-split signal, the negative of each weighted phase-split signal in each of said pluralities of weighted phase-split signals also being in such plurality of weighted phase-split signals; and summing selected ones of said weighted phase-split signals, said selection being made in response to said desired phase rotation amount. - View Dependent Claims (13, 114)
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14. Apparatus for processing ultrasonic energy incident on a plurality of ultrasonic transducers by phase-rotating an analog input signal by a desired phase rotation, comprising:
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a source providing said analog input signal as a plurality of input phase-split signals; amplifier circuitry weighting at least one of said input phase-split signals by a plurality of different fixed weights to produce a plurality of weighted phase-split signals; and a selective summer summing selected ones of said weighted phase-split signals, said selection being made in response to said desired phase rotation. - View Dependent Claims (15, 16, 17, 18, 19, 20, 115)
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21. Apparatus for processing ultrasonic energy incident on a plurality of ultrasonic transducers by phase-rotating an analog input signal by a desired one of a predefined set of available discrete amounts, comprising:
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a source providing said analog input signal as two input phase-split signals substantially in quadrature; amplifier circuitry weighting each of said input phase-split signals to produce a respective plurality of weighted phase-split signals for each of said input phase-split signals, the negative of each weighted phase-split signal in each of said pluralities of weighted phase-split signals also being in such plurality of weighted phase-split signals; and a selective summer summing selected ones of said weighted phase-split signals, said selection being made in response to said desired phase rotation amount. - View Dependent Claims (22, 116)
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23. A method for controlling an ultrasonic beamformer system, comprising the steps of:
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communicating a transmit data set from a central control to a transmit beamformer of said system, said transmit beamformer being coupled to excite an array of ultrasonic transducers to emit a transmit beam, said transmit data set indicating a transmit delay profile across said array which focuses said transmit beam; communicating a non-imaging receive data set from said central control to a separate local control of a non-imaging receive beamformer of said system, said non-imaging receive beamformer being coupled to receive signals for a non-imaging receive beam from said array of ultrasonic transducers, said non-imaging receive data set indicating a non-imaging receive delay profile across said array which focuses said non-imaging receive beam; communicating an imaging receive data set from said central control to an imaging receive beamformer of said system, said imaging receive beamformer being coupled to receive signals for an imaging receive beam from said array of transducers, said imaging receive data set indicating an imaging receive delay profile across said array which focuses said imaging receive beam; and in said central control, calculating both said transmit delay profile and said non-imaging receive delay profile from a common source delay profile. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. Apparatus for processing a plurality of input signals each responsive to ultrasonic energy incident on a respective ultrasonic receive element in an array, comprising:
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a first range gate range-gating a signal responsive to at least one of said input signals responsively to an enable input of said range gate; a first vector of bits for said first range gate; and applying means for applying sequential bits in said first vector to said enable input of said first range gate sequentially at predetermined intervals, said first range gate being enabled when the bit applied to said enable input has one logic level and disabled when the bit applied to said enable input has another logic level. - View Dependent Claims (31, 32, 33, 34, 35)
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36. Ultrasonic receive apparatus for processing analog signals from a plurality of ultrasonic receive elements in an array, which receive elements each generate a respective analog signal in response to ultrasonic energy incident thereon, comprising:
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a first, imaging receive beamformer responsive to said analog signals to produce a first beamformed output signal; and a second, non-imaging receive beamformer responsive to said analog signals to produce a second beamformed output signal, said second, non-imaging beamformer comprising a plurality of processing channels, each channel comprising a demodulator demodulating the respective analog signal to generate a respective baseband signal, and a phase rotator for aligning the respective baseband signal, said second, non-imaging beamformer using said aligned baseband signals to produce said second beamformed output signal. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A method for processing analog signals from a plurality of ultrasonic receive elements in an array, which receive elements each generate a respective analog signal in response to ultrasonic energy incident thereon, comprising:
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producing a first beamformed output signal using a first, imaging receive beamformer responsive to said analog signals from said array; and producing a second beamformed output signal using a second, non-imaging receive beamformer responsive to said analog signals from said array, said second beamformer comprising a plurality of processing channels, said step of producing said second beamformed output signal comprising demodulating said analog signals to generate respective baseband signals, rotating the phases of said baseband signals to align said baseband signals in said plurality of channels, and using said aligned baseband signals to produce said second beamformed output signal. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
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86. Ultrasonic receive apparatus, for processing analog signals from a plurality of ultrasonic receive elements in an array, which receive elements each generate a respective analog signal in response to ultrasonic energy incident thereon, comprising:
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a first, imaging receive beamformer responsive to said analog signals from said array to produce a first beamformed output signal; and a second, non-imaging receive beamformer responsive to said analog signals from said array to produce a second beamformed output signal; said second, non-imaging beamformer comprising at least one demodulator generating a demodulated analog signal, and a plurality of processing channels, each channel comprising a phase rotator producing a respective analog phase-rotated signal, said demodulator being separate from said phase rotator, said second, non-imaging beamformer applying said analog signals in a selected order to said phase rotators and to said demodulator in producing said second beamformed output signal. - View Dependent Claims (87, 88, 89, 90, 91, 92, 93)
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94. A method for processing analog signals from a plurality of ultrasonic receive elements in an array, which receive elements each generate a respective analog signal in response to ultrasonic energy incident thereon, comprising:
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receiving said analog signals from said array in a first, imaging receive beamformer and producing a first beamformed output signal; and receiving said analog signals from said array in a second, non-imaging receive beamformer and producing a second beamformed output signal; said step of producing a second beamformed output signal comprising the steps of phase-rotating the analog signals received by said second, non-imaging beamformer to produce respective focused analog phase-rotated signals, and separate from said step of phase rotating, demodulating said analog signals. - View Dependent Claims (95, 96, 97, 98, 99, 100, 101, 102)
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103. Ultrasonic imaging apparatus, for processing analog signals from a plurality of ultrasonic receive elements in an array, which receive elements each generate a respective analog signal in response to ultrasonic energy incident thereon, comprising:
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a transmit beamformer, said transmit beamformer coupled to excite said array of ultrasonic transducers to emit a transmit beam; a first, imaging receive beamformer, said first, imaging receive beamformer responsive to analog signals from said array of ultrasonic transducers; a second, non-imaging receive beamformer, said second, non-imaging receive beamformer responsive to said analog signals from said array of ultrasonic transducers; a central control communicating a transmit data set to said transmit beamformer, said transmit data set indicating a transmit delay profile across said array which focuses said transmit beam; said central control communicating a non-imaging receive data set to a separate local control of said non-imaging receive beamformer, said non-imaging receive data set indicating a non-imaging receive delay profile across said array which focuses a non-imaging receive beam; said central control communicating an imaging receive data set to said imaging receive beamformer, said imaging receive data set indicating an imaging receive delay profile across said array which focuses an imaging receive beam; and said central control calculating both said transmit delay profile and said non-imaging receive delay profile from a common source delay profile. - View Dependent Claims (104, 105, 106, 107, 108, 109, 110, 111)
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112. Apparatus for processing a plurality of analog signals each responsive to ultrasonic energy incident on a respective ultrasonic receive element in an array, comprising:
a non-imaging beamformer responsive to said analog signals to produce a beamformed output signal, said non-imaging beamformer comprising; a plurality of range gates each coupled to range gate a respective one of said input signals; a plurality of focusing phase-rotators each coupled to phase-rotate a respective one of said input signals; and a summer coupled to sum signals responsive to said gated, phase-rotated signals to produce a summed signal; a demodulator demodulating a signal responsive to at least one of said input signals; and an integrator, downstream of said demodulator, said integrator integrating a signal responsive to said summed signal to produce an output value.
Specification