Ultrasound diagnostic apparatus, sound velocity setting method, and recording medium
First Claim
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1. An ultrasound diagnostic apparatus comprising:
- a piezoelectric element array having piezoelectric elements arranged therein, each adapted to transmit ultrasonic waves, receive ultrasonic echoes reflected by a subject, and output reception signals according to received ultrasonic waves;
a control processor adapted to control transmission and reception of ultrasonic waves by the piezoelectric element array, and adapted to input a region-of-interest of the ultrasound image, the region-of-interest being a portion of a whole area of the ultrasound image;
a memory adapted to store the reception signals output by the piezoelectric element array;
a sound velocity setting processor adapted to divide the subject into multiple segment regions and set a sound velocity for each of the segment regions with use of the reception signals stored in the memory;
an image producing processor adapted to produce an ultrasound image by processing the reception signals output by the piezoelectric element array or the reception signals read out from the memory based on the sound velocity set for each of the segment regions; and
wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an SR frame formed with transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions in the region-of-interest is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the SR frame to reset sound velocities of all of the segment regions corresponding to the transmission focal points for sound velocity setting in the region-of-interest in every predetermined number of frames,wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an S frame formed with the transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions of a whole area of the ultrasound image is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the S frame to reset sound velocities of all of the segment regions corresponding to the whole area of the ultrasound image, andwherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves such that the S frame is produced after the predetermined number of frames are produced once or more times.
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Abstract
An ultrasound diagnostic apparatus performs transmission and reception of ultrasonic waves for forming focal points used to set sound velocities at predetermined timing such that sound velocities having been set for all of respective segment regions established by diving a subject are all reset every predetermined number of frames. Owing to this configuration, it becomes possible for the ultrasound diagnostic apparatus to suitably reset sound velocities of ultrasonic waves in the subject and also reduce the amount of calculation for resetting sound velocities.
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Citations
12 Claims
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1. An ultrasound diagnostic apparatus comprising:
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a piezoelectric element array having piezoelectric elements arranged therein, each adapted to transmit ultrasonic waves, receive ultrasonic echoes reflected by a subject, and output reception signals according to received ultrasonic waves; a control processor adapted to control transmission and reception of ultrasonic waves by the piezoelectric element array, and adapted to input a region-of-interest of the ultrasound image, the region-of-interest being a portion of a whole area of the ultrasound image; a memory adapted to store the reception signals output by the piezoelectric element array; a sound velocity setting processor adapted to divide the subject into multiple segment regions and set a sound velocity for each of the segment regions with use of the reception signals stored in the memory; an image producing processor adapted to produce an ultrasound image by processing the reception signals output by the piezoelectric element array or the reception signals read out from the memory based on the sound velocity set for each of the segment regions; and wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an SR frame formed with transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions in the region-of-interest is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the SR frame to reset sound velocities of all of the segment regions corresponding to the transmission focal points for sound velocity setting in the region-of-interest in every predetermined number of frames, wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an S frame formed with the transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions of a whole area of the ultrasound image is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the S frame to reset sound velocities of all of the segment regions corresponding to the whole area of the ultrasound image, and wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves such that the S frame is produced after the predetermined number of frames are produced once or more times. - View Dependent Claims (2, 3, 4)
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5. A sound velocity setting method, comprising the steps of:
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at a time when a sound velocity in a subject is set by an ultrasound diagnostic apparatus comprising a piezoelectric element array, a sound velocity setting processor and a control processor, performing transmission of ultrasonic waves, reception of ultrasonic echoes reflected by the subject, and output of reception signals according to the received ultrasonic waves at the piezoelectric element array; controlling transmission and reception of ultrasonic waves at the control processor; dividing the subject into multiple segment regions and setting a sound velocity for each of the segment regions using the received signals at the sound velocity setting processor; and inputting a region-of-interest of the ultrasound image, the region-of-interest being a portion of a whole area of the ultrasound image, wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an SR frame formed with transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions in the region-of-interest is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the SR frame to reset sound velocities of all of the segment regions corresponding to the transmission focal points for sound velocity setting in the region-of-interest in every predetermined number of frames, wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an S frame formed with the transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions of a whole area of the ultrasound image is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the S frame to reset sound velocities of all of the segment regions corresponding to the whole area of the ultrasound image, and wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves such that the S frame is produced after the predetermined number of frames are produced once or more times. - View Dependent Claims (6, 7, 8)
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9. A non-transitory recording medium having stored therein a program that is used by an ultrasound diagnostic apparatus comprising a piezoelectric element array, a sound velocity setting processor and a control processor to set a sound velocity of a subject and that causes a computer to implement:
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performing transmission of ultrasonic waves, reception of ultrasonic echoes reflected by a subject, and output of reception signals according to the received ultrasonic waves at the piezoelectric element array; controlling transmission and reception of ultrasonic waves using the control processor; dividing the subject into multiple segment regions and setting a sound velocity for each of the segment regions using the received signals at the sound velocity setting processor; and setting a sound velocity for each of the segment regions with use of the reception signals at the sound velocity setting processor; and receiving a region-of-interest of the ultrasound image, the region-of-interest being a portion of a whole area of the ultrasound image, wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an SR frame formed with transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions in the region-of-interest is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the SR frame to reset sound velocities of all of the segment regions corresponding to the transmission focal points for sound velocity setting in the region-of-interest in every predetermined number of frames, wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves at a predetermined timing so as to produce an S frame formed with the transmission focal points for sound velocity setting based on which the sound velocity for each of the segment regions of a whole area of the ultrasound image is set, and the sound velocity setting processor uses the reception signals obtained by transmission and reception of ultrasonic waves that produce the transmission focal points for sound velocity setting in the S frame to reset sound velocities of all of the segment regions corresponding to the whole area of the ultrasound image, and wherein the control processor causes the piezoelectric element array to perform transmission and reception of ultrasonic waves such that the S frame is produced after the predetermined number of frames are produced once or more times. - View Dependent Claims (10, 11, 12)
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Specification