PRF adjustment method and apparatus, and ultrasonic wave imaging apparatus
First Claim
Patent Images
1. An ultrasonic wave imaging apparatus comprising:
- velocity distribution calculating means which calculates the velocity distribution of an echo source based on the Doppler shift of an echo received from a repetitively transmitted ultrasonic wave;
profile calculating means which calculates the profile of said velocity distribution, reflection correcting means which corrects the reflection of said profile;
maximum value detecting means which detects the maximum value of the velocity in said corrected profile;
repetition frequency adjusting means which adjusts the repetition frequency of said ultrasonic wave based on said maximum value; and
display means which displays said velocity distribution as an image.
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Abstract
In order to obtain an optimum PRF, the velocity distribution of an echo source is calculated based on the Doppler shift of an ultrasonic wave echo, the profile of the velocity distribution is calculated (172), the reflection of the profile is corrected (174), the maximum value of the velocity in the corrected profile is detected (176), and the PRF of the ultrasonic wave transmission is adjusted based thereon (178).
19 Citations
32 Claims
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1. An ultrasonic wave imaging apparatus comprising:
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velocity distribution calculating means which calculates the velocity distribution of an echo source based on the Doppler shift of an echo received from a repetitively transmitted ultrasonic wave;
profile calculating means which calculates the profile of said velocity distribution, reflection correcting means which corrects the reflection of said profile;
maximum value detecting means which detects the maximum value of the velocity in said corrected profile;
repetition frequency adjusting means which adjusts the repetition frequency of said ultrasonic wave based on said maximum value; and
display means which displays said velocity distribution as an image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17, 18)
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11. An ultrasonic wave imaging apparatus comprising:
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a pulsation intensity distribution calculating means which calculates a pulsation intensity distribution of an echo source based on the Doppler shift of an echo received from a repetitively transmitted ultrasonic wave;
velocity distribution calculating means which calculates the velocity distribution of the echo source based on the Doppler shift of the echo received from the repetitively transmitted ultrasonic wave;
calculating means which calculates the profile of said velocity distribution;
reflection correcting means which corrects the reflection of said profile;
maximum value detecting means which detects the maximum value of the velocity in said corrected profile;
repetition frequency adjusting means which adjusts the repetition frequency of said ultrasonic wave based on said maximum value; and
display means which displays said pulsation intensity distribution as an image. - View Dependent Claims (12, 13)
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19. A PRF adjustment method comprising the steps of:
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storing in a memory a plurality of repetitive frequencies;
calculating the velocity distribution of an echo source based on the Doppler shift of an echo received from a repetitively transmitted ultrasonic wave;
calculating the profile of said velocity distribution;
correcting the reflection of said profile;
detecting the maximum value of the velocity in said corrected profile; and
selecting from said plurality of repetitive frequencies stored in said memory the nearest value of repetitive frequency to said maximum value so that a desired amount of reflection is provided in said profile. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A PRF adjustment apparatus comprising:
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memory means for priorly storing a plurality of repetitive frequencies;
velocity distribution calculating means which calculates the velocity distribution of an echo source based on the Doppler shift of an echo received from a repetitively transmitted ultrasonic wave;
profile calculating means for calculating the profile of said velocity distribution;
reflection correcting means which corrects the reflection of said profile;
maximum value detecting means which detects the maximum value of the velocity in said corrected profile; and
selecting means for selecting from said plurality of repetitive frequencies stored in said memory the nearest value of repetitive frequency to said maximum value so that a desired amount of reflection is provided in said profile. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification