Patent ID: 11969288
Assignee: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 2:
3. A three-dimensional ultrasound imaging system, comprising:
a probe configured to transmit ultrasound waves towards a head of a fetus and receive ultrasound echoes to obtain ultrasound echo signals;
a processing unit configured to:
obtain a three-dimensional volume data of the head of the fetus based on the ultrasound echo signals;
select a group of candidate section images from the three-dimensional volume data, wherein the group of candidate section images is a group of longitudinal section images of the three-dimensional volume data;
calculate a symmetry indicator for each candidate section image of the group of candidate section images to obtain a group of symmetry indicators;
select a symmetry indicator from the group of symmetry indicators that satisfies a characteristic condition; and
identify, using the selected symmetry indicator, a corresponding candidate selection image as a median sagittal section image; and

a display device configured to display the median sagittal section image,
wherein the processing unit is further configured to:
for each candidate section image of the group of candidate section images:
select at least one pair of first region and second region outside both sides of the candidate section image, wherein the first region and the second region are symmetrical with respect to the candidate section image; and
calculate a sum of absolute values of differences between gray values of points being symmetrical with respect to the candidate section image in the first region and in the second region, and determine the sum of the absolute values as the symmetry indicator of the candidate section image.