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

Claim 0:
1. A three-dimensional ultrasound imaging method, comprising:
transmitting ultrasound waves towards a head of a fetus;
receiving ultrasound echoes to obtain ultrasound echo signals;
obtaining a three-dimensional volume data of the head of the fetus based on the ultrasound echo signals;
selecting 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;
calculating a symmetry indicator for each candidate section image of the group of candidate section images to obtain a group of symmetry indicators;
selecting a symmetry indicator from the group of symmetry indicators that satisfies a characteristic condition;
using the selected symmetry indicator to identify a corresponding candidate selection image as a median sagittal section image; and
displaying the median sagittal section image,
wherein calculating the symmetry indicator for each candidate section image of the group of candidate section images comprises:
for each candidate section image of the group of candidate section images:
selecting 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
calculating 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 determining the sum of the absolute values as the symmetry indicator of the candidate section image.