Ultrasound diagnostic apparatus, program, and method of operating ultrasound diagnosis apparatus
A temporal change at each coordinate of interest which is spatially fixed in frame data of a plurality of time phases obtained by transmitting and receiving ultrasound is made understandable. A trace processor derives an amount of temporal change at each coordinate of interest of a plurality of coordinates of interest which are spatially fixed in the frame data over a plurality of time phases. The trace processor also derives an amount of spatial movement of each site of interest based on the amount of temporal change of each coordinate of interest near each site of interest. Further, the trace processor derives an amount of spatial movement of each site of interest for each time phase over a plurality of time phases in a trace period, and traces a motion of each site of interest in the trace period based on the amount of movement derived for each time phase.
1. An ultrasound diagnostic apparatus, configured to:
set frame data of a plurality of time phases, obtained by transmitting and receiving ultrasound to and from a diagnosis target of the ultrasound diagnostic apparatus, as a processing target;
derive an amount of temporal change at each coordinate of interest of a plurality of coordinates of interest which are spatially fixed in the frame data over the plurality of time phases;
set one or more sites of interest in the diagnosis target in frame data of a particular time phase of the plurality of time phases; and
derive an amount of spatial movement of each of the one or more sites of interest based on the amount of temporal change at one or more of the plurality of coordinates of interest.
2. The ultrasound diagnostic apparatus according to claim 1 , wherein
a distribution of correlation values is generated for each coordinate of interest by a correlation calculation between time phases based on frame data in a target period which is a processing target among the plurality of time phases, and
the amount of temporal change at each coordinate of interest is derived based on the distribution of the correlation values obtained for each coordinate of interest.
3. The ultrasound diagnostic apparatus according to claim 2 , wherein
dynamic programming in a time axis direction is applied to the distribution of the correlation values obtained for each time phase over a plurality of time phases in the target period for each coordinate of interest, to derive the amount of temporal change at each coordinate of interest.
4. The ultrasound diagnostic apparatus according to claim 1 , comprising:
a detector that detects a plurality of key frames corresponding to a distinct time phase from among the frame data of the plurality of time phases collected by transmitting and receiving the ultrasound; and
a processor that sequentially sets, as a processing target, frame data of a plurality of time phases from a time phase corresponding to one of two key frames included in the plurality of key frames to a time phase corresponding to the other of the two key frames, and that derives the amount of temporal change of a tissue at a fixed position corresponding to each coordinate of interest.
5. The ultrasound diagnostic apparatus according to claim 4 , wherein
the processor derives the amount of spatial movement of each site of interest for each time phase over a plurality of time phases in a trace period which is a target of tracing, and traces a motion of each site of interest over the plurality of time phases in the trace period based on an amount of movement derived for each time phase.
6. The ultrasound diagnostic apparatus according claim 4 , wherein
the processor generates a correlation value map showing a distribution of correlation values for each coordinate of interest by a correlation calculation between time phases based on the frame data in a target period which is a processing target, and applies dynamic programming in a time axis direction to the correlation value map obtained for each time phase over a plurality of time phases in the target period for each coordinate of interest, to derive the amount of temporal change at each coordinate of interest.
7. The ultrasound diagnostic apparatus according to claim 5 , wherein
the processor generates a correlation value map showing a distribution of correlation values for each coordinate of interest by a correlation calculation between time phases based on the frame data in a target period which is a processing target, and applies dynamic programming in a time axis direction to the correlation value map obtained for each time phase over a plurality of time phases in the target period for each coordinate of interest, to derive the amount of temporal change at each coordinate of interest.
8. The ultrasound diagnostic apparatus according to claim 6 , wherein
the processor applies parabola fitting in a spatial direction to the correlation value map obtained for each coordinate of interest, to derive the amount of temporal change at each coordinate of interest.
9. The ultrasound diagnostic apparatus according to claim 5 , wherein
a vector display image showing a size and a direction of the amount of spatial movement of each site of interest is generated and displayed.
10. A non-transitory computer-readable medium storing a program which, when executed, causes a computer to realize functions to:
set frame data of a plurality of time phases, obtained by transmitting and receiving an ultrasound to and from a diagnosis target of the ultrasound diagnostic apparatus, as a processing target;
derive an amount of temporal change at each coordinate of interest of a plurality of coordinates of interest which are spatially fixed in the frame data over the plurality of time phases;
set one or more sites of interest in the diagnosis target in frame data of a particular time phase of the plurality of time phases; and
derive an amount of spatial movement of each of the one or more sites of interest based on the amount of temporal change at one or more of the plurality of coordinates of interest.