Ultrasound diagnosis apparatus and ultrasound signal generating method
An ultrasound diagnosis apparatus according to an embodiment includes processing circuitry. This processing circuitry collects a first ultrasound signal including one or more harmonic components. By executing weighed addition processing where a coefficient distribution is applied to the first ultrasound signal for different directions of two or more dimensions, the processing circuitry generates a second ultrasound signal including components of each order at a ratio different, at a specific frequency, from a ratio among the frequency components included in the first ultrasound signal.
1 . An ultrasound diagnosis apparatus, comprising:
an ultrasound probe, and
processing circuitry that
collects a first ultrasound signal including one or more harmonic components based on received signals based on reflected waves from a subject, the received signals being received by the ultrasound probe; and
by executing weighed addition processing where a coefficient distribution is applied to the first ultrasound signal for different directions of two or more dimensions, generates a second ultrasound signal including components of each order at a ratio different, at a specific frequency, from a ratio among frequency components included in the first ultrasound signal,
wherein the processing circuitry further
collects, as the first ultrasound signal, an ultrasound signal in which a harmonic component of either an odd order or even order is enhanced relative to a harmonic component of an other order, and
generates, as the second ultrasound signal, by executing the weighted addition processing on the first ultrasonic signal, a harmonic signal in which a harmonic component of a predetermined multiple order in the first ultrasound signal is enhanced more than a harmonic component of other orders in the first ultrasound signal.
2 . The ultrasound diagnosis apparatus according to claim 1 , wherein the processing circuitry further
causes the ultrasound probe to transmit a plurality of ultrasound signals having a first phase difference to the subject,
by subtracting the received signals based on the reflected waves from the subject, collects, as the first ultrasound signal, ultrasound signal in which a harmonic component of the odd order is enhanced relative to a harmonic component of the even order, and
by executing the weighed addition processing on the first ultrasound signal, generates, as the second ultrasound signal, a harmonic signal in which a harmonic component of an order that is a multiple of three is enhanced more than a harmonic component of order other than the order that is the multiple of three,
the plurality of the ultrasound signals having the first phase difference is two ultrasound signals having a phase difference of 180 degrees, and
the second ultrasound signal is a signal equivalent to an ultrasound signal in which a harmonic component of an order that is the multiple of three is enhanced, the signal being obtained by causing the ultrasound probe to transmit three ultrasound signals having a phase difference of 120 degrees to the subject and by adding the received signals based on the reflected waves from the subject.
3 . The ultrasound diagnosis apparatus according to claim 1 , wherein the processing circuitry further
causes the ultrasound probe to transmit a plurality of ultrasound signals having a first phase difference to the subject,
by adding the received signals based on the reflected waves from the subject, collects, as the first ultrasound signal, ultrasound signal in which a harmonic component of the even order is enhanced relative to a harmonic component of the odd order, and
by executing the weighed addition processing on the first ultrasound signal, generates, as the second ultrasound signal, a harmonic signal in which a harmonic component of an order that is a multiple of four is enhanced more than a harmonic component of order other than the order that is the multiple of four,
the plurality of the ultrasound signals having the first phase difference is two ultrasound signals having a phase difference of 180 degrees, and
the second ultrasound signal is a signal equivalent to an ultrasound signal in which a harmonic component of an order that is the multiple of four is enhanced, the signal being obtained by causing the ultrasound probe to transmit four ultrasound signals having a phase difference of 90 degrees to the subject and by adding the received signals based on the reflected waves from the subject.
4 . The ultrasound diagnosis apparatus according to claim 2 , wherein the processing circuitry further generates the second ultrasound signal by using a trained model that is trained to output a harmonic signal in which a harmonic component of an order that is a multiple of three is enhanced more than a harmonic component of order other than the order that is the multiple of three, in response to input of an ultrasonic signal in which a harmonic component of the odd order is enhanced relative to a harmonic component of the even order.
5 . The ultrasound diagnosis apparatus according to claim 3 , wherein the processing circuitry further generates the second ultrasound signal by using a trained model that is trained to output a harmonic signal in which a harmonic component of an order that is a multiple of four is enhanced more than a harmonic component of order other than the order that is the multiple of four, in response to input of an ultrasonic signal in which a harmonic component of the even order is enhanced relative to a harmonic component of the odd order.
6 . A harmonic signal obtaining method, comprising:
collecting a first ultrasound signal including one or more harmonic components based on received signals based on reflected waves from a subject, the received signals being received by an ultrasound probe; and
by executing weighed addition processing where a coefficient distribution is applied to the first ultrasound signal for different directions of two or more dimensions, generating a second ultrasound signal including components of each order at a ratio different, at a specific frequency, from a ratio among frequency components included in the first ultrasound signal, wherein
the collecting further comprises collecting, as the first ultrasound signal, ultrasound signal in which a harmonic component of either an odd order or even order is enhanced relative to a harmonic component of the other order, and
the generating further comprises generating, as the second ultrasound signal, by executing the weighted addition processing on the first ultrasonic signal, a harmonic signal in which a harmonic component of a predetermined multiple order in the first ultrasound signal is enhanced more than harmonic component of other orders in the first ultrasound signal.