ULTRASONIC DIAGNOSTIC APPARATUS
According to one embodiment, an ultrasonic diagnostic apparatus includes an ultrasonic probe and processing circuitry. The ultrasonic probe has a plurality of elements and is configured to transmit an ultrasonic beam a plurality of times. The plurality of elements is divided in an elevation direction. The processing circuitry is configured to control a transmission aperture of the ultrasonic probe so as to match an area and a position of elements which form one of ultrasonic beams transmitted the plurality of times with an area and a position of elements which form remaining ultrasonic beams.
1 . An ultrasonic diagnostic apparatus comprising:
an ultrasonic probe having a plurality of elements and configured to transmit an ultrasonic beam a plurality of times, the plurality of elements being divided in an elevation direction; and
processing circuitry configured to control a transmission aperture of the ultrasonic probe so as to match an area and a position of elements which form one of ultrasonic beams transmitted the plurality of times with an area and a position of elements which form remaining ultrasonic beams.
2 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the processing circuitry controls the transmission aperture so as to have a width of the elements of the ultrasonic probe in an azimuth direction for each ultrasonic beam.
3 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the processing circuitry controls the transmission aperture so as not to transmit the remaining ultrasonic beams from some of elements adjacent to each other in the elevation direction.
4 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the ultrasonic probe includes three element rows divided in the elevation direction,
the one of the ultrasonic beams are ultrasonic beams from all elements, and
the remaining ultrasonic beams include an ultrasonic beam from one element row located at a middle portion in the azimuth direction and ultrasonic beams from two element rows located at end portions in the azimuth direction.
5 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the plurality of transmissions of the ultrasonic beams are three transmissions of an ultrasonic beams,
the one of the ultrasonic beams are ultrasonic beams transmitted second, and
the processing circuitry inverts a phase for each transmission.
6 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the processing circuitry is further configured to generate a contrast-enhanced image based on a differential signal between an echo signal corresponding to the one of the ultrasonic beams and an echo signal corresponding to the remaining ultrasonic beams.
7 . The ultrasonic diagnostic apparatus according to claim 6 , wherein the processing circuitry is further configured to:
determine whether or not bioacoustic shadow has occurred in the contrast-enhanced image; and
change a transmission aperture control scheme of the ultrasonic probe if the bioacoustic shadow has occurred in the contrast-enhanced image.
8 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the plurality of times are not less than three.
9 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the remaining ultrasonic beams include a plurality of ultrasonic beams, and the respective ultrasonic beams have different patterns.
10 . The ultrasonic diagnostic apparatus according to claim 1 , wherein the processing circuitry sets the transmission aperture of the ultrasonic beam so as to group a plurality of elements adjacent to each other in an azimuth direction of the ultrasonic probe into element groups for transmission of the ultrasonic beam, set an interval corresponding to at least two elements between the element groups adjacent to each other in the azimuth direction, and set the element groups in a checker pattern in the elevation direction.
11 . The ultrasonic diagnostic apparatus according to claim 10 , wherein the element group includes a plurality of elements adjacent to each other in the elevation direction.