Method for optimization of transmit and receive ultrasound pulses, particularly for ultrasonic imaging
First Claim
1. A method of ultrasonic imaging comprising the step of optimizing one or more ultrasonic pulses in conjunction with ultrasonic imaging, wherein transmit pulses are generated from ultrasonic pulse contributions of each of a plurality of electroacoustic transducers, said transducers being grouped in an array and being individually triggered by electric excitation signals, said excitation signal being applied to each individual transducer of said array having a predetermined delay with respect to the application of the excitation signal that is applied to the other transducers of said plurality of transducers, and wherein a weight is applied to the excitation signal for each transducer for adjusting the amplitude of said excitation signal, characterized in the following steps:
- defining an optimal desired mechanical pressure profile for said transmit pulses relative to the penetration depth of said transmit pulses within the body or object being examined as a function of at least amplitude weighting parameters for said transducers'"'"' contributions to said transmit pulses, and of the delays of excitation for transmission of individual pulse contributions of transducers, aimed at focusing comprehensive pulses on a scan line or band and at a certain penetration depth within the body or object under examination;
defining an ideal beam pattern for said transmit pulses relative to the propagation time or penetration depth within the body or object under examination as a function of at least amplitude weighting parameters for said transducers'"'"' contributions to said transmit pulses, and of delays of excitation delays for transmission of individual pulse contributions of transducers aimed at focusing comprehensive pulses on a scan line or band and at a certain penetration depth within the body or object under examination;
defining an energy function which depends on the difference between said ideal pressure profile and the actual pressure profile and between said ideal beam pattern and the actual beam pattern;
determining the minimum of said energy function;
determining said weighting parameters and said delays which correspond to the minimum of the energy function and applying said weighting parameters and said delays to said excitation signals for exciting said transducers to generate said comprehensive pulses.
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Abstract
A method for optimizing transmit and receive ultrasound imaging pulses generates transmit pulses from an array of transducers which are energized by excitation signals that are applied to each individual transducer of the array. Each of the excitation signals are individually weighted to optimize the transducers'"'"' contribution to a predetermined energy function. Such optimization may also be performed on the received pulses.
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Citations
60 Claims
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1. A method of ultrasonic imaging comprising the step of optimizing one or more ultrasonic pulses in conjunction with ultrasonic imaging, wherein transmit pulses are generated from ultrasonic pulse contributions of each of a plurality of electroacoustic transducers, said transducers being grouped in an array and being individually triggered by electric excitation signals, said excitation signal being applied to each individual transducer of said array having a predetermined delay with respect to the application of the excitation signal that is applied to the other transducers of said plurality of transducers, and wherein a weight is applied to the excitation signal for each transducer for adjusting the amplitude of said excitation signal, characterized in the following steps:
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defining an optimal desired mechanical pressure profile for said transmit pulses relative to the penetration depth of said transmit pulses within the body or object being examined as a function of at least amplitude weighting parameters for said transducers'"'"' contributions to said transmit pulses, and of the delays of excitation for transmission of individual pulse contributions of transducers, aimed at focusing comprehensive pulses on a scan line or band and at a certain penetration depth within the body or object under examination; defining an ideal beam pattern for said transmit pulses relative to the propagation time or penetration depth within the body or object under examination as a function of at least amplitude weighting parameters for said transducers'"'"' contributions to said transmit pulses, and of delays of excitation delays for transmission of individual pulse contributions of transducers aimed at focusing comprehensive pulses on a scan line or band and at a certain penetration depth within the body or object under examination; defining an energy function which depends on the difference between said ideal pressure profile and the actual pressure profile and between said ideal beam pattern and the actual beam pattern; determining the minimum of said energy function; determining said weighting parameters and said delays which correspond to the minimum of the energy function and applying said weighting parameters and said delays to said excitation signals for exciting said transducers to generate said comprehensive pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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12. A method as claimed in claimed 3, characterized in that said energy function is modified in such manner as to include integration of any excess values of what was actually obtained with respect to what was desired.
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31. A method of ultrasonic imaging comprising the step of optimizing one or more ultrasonic pulses in conjunction with ultrasonic imaging, wherein receive pulses are generated from ultrasonic pulse contributions of each of a plurality of electroacoustic transducers, said transducers being grouped in an array and being individually triggered by electric excitation signals, said excitation signal being applied to each individual transducer of said array having a predetermined delay with respect to the application of the excitation signal that is applied to the other transducers of said plurality of transducers, and wherein a weight is applied to the excitation signal for each transducer for adjusting the amplitude of said excitation signal, characterized in the following steps:
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defining an optimal desired mechanical pressure profile for said receive pulses relative to the penetration depth of said receive pulses within the body or object being examined as a function of at least amplitude weighting parameters for said transducers'"'"' contributions to said receive pulses, and of the delays of excitation for reception of individual pulse contributions of transducers, aimed at focusing comprehensive pulses on a scan line or band and at a certain penetration depth within the body or object under examination; defining an ideal beam pattern for said receive pulses relative to the propagation time or penetration depth within the body or object under examination as a function of at least amplitude weighting parameters for said transducers'"'"' contributions to said receive pulses, and of delays of excitation delays for reception of individual pulse contributions of transducers aimed at focusing comprehensive pulses on a scan line or band and at a certain penetration depth within the body or object under examination; defining an energy function which depends on the difference between said ideal pressure profile and the actual pressure profile and between said ideal beam pattern and the actual beam pattern; determining the minimum of said energy function; determining said weighting parameters and said delays which correspond to the minimum of the energy function and applying said weighting parameters and said delays to said excitation signals for exciting said transducers to generate said comprehensive pulses. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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42. A method as claimed in claimed 33, characterized in that said energy function is modified in such manner as to include integration of any excess values of what was actually obtained with respect to what was desired.
Specification