US 10,376,236 B2
Ultrasound diagnostic apparatus, image processing apparatus, and image processing method
Yasuhiko Abe, Otawara (JP)
Assigned to Canon Medical Systems Corporation, Otawara-shi (JP)
Filed by Canon Medical Systems Corporation, Otawara-shi (JP)
Filed on May 20, 2015, as Appl. No. 14/717,646.
Application 14/717,646 is a continuation of application No. PCT/JP2013/080813, filed on Nov. 14, 2013.
Claims priority of application No. 2012-255579 (JP), filed on Nov. 21, 2012; and application No. 2013-235938 (JP), filed on Nov. 14, 2013.
Prior Publication US 2015/0257731 A1, Sep. 17, 2015
Int. Cl. A61B 8/08 (2006.01); G06T 7/246 (2017.01)
CPC A61B 8/0883 (2013.01) [A61B 8/5207 (2013.01); G06T 7/246 (2017.01); G06T 2207/10132 (2013.01); G06T 2207/30048 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An ultrasound diagnostic apparatus comprising:
an ultrasound probe configured to emit ultrasound waves and detect reflected waves that are used to generate ultrasound image data, the ultrasound image data representing two- or three-dimensional ultrasound images of a target-including region containing a tissue in motion, the ultrasound images corresponding to a plurality of temporal phases; and
processing circuitry configured to
set, for at least one temporal phase of the plurality of temporal phases, a two- or three-dimensional region of interest in the ultrasound image data, the region of interest representing a portion of the tissue,
obtain movement information by a tracking process using the ultrasound images, wherein the movement information represents motion vectors of first points in the region of interest, and corresponds to a likelihood that when a first point is translated according to the motion vectors relative to positions within the respective ultrasound images, the positions within the respective ultrasound images refer to a same location on the target,
obtain a reliability index based on indicia of reliability of the movement information including at least one variable obtained from the tracking process,
determine, using the movement information, movement-based positions, which are first estimates of positions of the region of interest in ultrasound images corresponding to remaining temporal phases, which are temporal phases of the plurality of temporal phases other than the at least one temporal phase,
determine, using shape information of a shape of the tissue, shape-based positions, which are second estimates of the positions of the region of interest in the ultrasound images corresponding to the remaining temporal phases, the shape-based positions being determined by estimating the shape of the tissue in the remaining temporal phases and then determining the second estimates of the positions of the region of interest from the estimated shape of the tissue in the remaining temporal phases,
combine the movement-based positions with the shape-based positions by weighting the movement-based positions relative to the shape-based positions based on the reliability index, to generate position information of the region of interest, the weighting being performed such that, for a value of the reliability index indicating a greater reliability of the movement information, a contribution to the generated position information by the movement-based positions is increased relative to a contribution by the shape-based positions, and
track the region of interest using the position information of the region of interest by updating the region of interest with respect to time in accordance with changes of the region of interest represented by the position information.