Ultrasonic harmonic flash suppression
First Claim
1. An ultrasonic diagnostic imaging system which produces harmonic images with reduced motional artifacts comprising:
- a transducer which transmits fundamental frequency signals and receives echo signals in response thereto at a harmonic frequency;
a harmonic signal separator circuit which separates the harmonic signal components of the received echo signals;
an image display, responsive to the harmonic components, which produces a harmonic ultrasonic image;
a motion detection circuit which detects motion signal components in the received echo signals; and
a motion artifact cancellation circuit, responsive to the motion detection circuit and coupled to the image display, which reduces motion artifacts in the harmonic ultrasonic image.
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Accused Products
Abstract
Ultrasonic imaging apparatus and method are described for reducing the flash artifact in ultrasonic harmonic images. Harmonic signals are separated by pulse inversion separation which uses multiple transmit pulses which may be subject to motion artifacts. The motion artifacts are detected and subtracted from the harmonic signals to produce harmonic images with reduced flash artifacts. The motion artifacts may also be reduced by notch filtering. In another embodiment the amount of motion in the image is detected and the flash artifact is reduced in accordance with the detected motion. The amount of artifact signal which is removed is variable in accordance with anticipated image motion or clinical application.
68 Citations
30 Claims
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1. An ultrasonic diagnostic imaging system which produces harmonic images with reduced motional artifacts comprising:
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a transducer which transmits fundamental frequency signals and receives echo signals in response thereto at a harmonic frequency;
a harmonic signal separator circuit which separates the harmonic signal components of the received echo signals;
an image display, responsive to the harmonic components, which produces a harmonic ultrasonic image;
a motion detection circuit which detects motion signal components in the received echo signals; and
a motion artifact cancellation circuit, responsive to the motion detection circuit and coupled to the image display, which reduces motion artifacts in the harmonic ultrasonic image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for reducing motion artifacts from an ultrasonic harmonic image comprising:
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transmitting a fundamental frequency transmit signal;
receiving echo signals at a harmonic of the fundamental frequency, which echo signals may also be contaminated by motion artifacts;
detecting motion artifacts in the received echo signals; and
utilizing the detected motion artifacts to reduce motion artifacts in a displayed harmonic image. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
wherein the predetermined amplitude is determined by the amount of anticipated motion in the image. -
19. The method of claim 18, wherein the predetermined amplitude is determined by the application for which the imaging is being performed.
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20. A method for reducing motion artifacts from an ultrasonic harmonic image comprising:
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transmitting a fundamental frequency transmit signal;
receiving echo signals at a harmonic of the fundamental frequency, which echo signals may also be contaminated by motion artifacts;
detecting the presence of motion in the received echo signals; and
utilizing the detection of motion to reduce motion artifacts a displayed harmonic image. - View Dependent Claims (21, 22)
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23. A method for reducing motion artifacts from an ultrasonic harmonic image comprising:
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transmitting a fundamental frequency transmit signal;
receiving echo signals at the fundamental frequency and at a harmonic of the fundamental frequency, which echo signals may also be contaminated by motion artifacts;
separating harmonic signals of the echo signals by pulse inversion;
detecting motion artifacts in the separated harmonic signals;
removing motion artifacts from the separated harmonic signals; and
producing an ultrasonic harmonic image using the separated harmonic signals from which motion artifacts have been removed. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification