Method for measuring parameters in ultrasonic image and ultrasonic imaging system

1. A method for measuring a parameter in an ultrasound image, comprising:

obtaining, by an image processor, an ultrasound image by detecting ultrasound signals from a target tissue with an ultrasound probe, wherein the ultrasound image contains an area representing the target tissue;

displaying, by the image processor, the ultrasound image on a display;

obtaining, by the image processor, a measurement instruction based on the ultrasound image and according to a user input, by:

receiving a parameter item from the user input, wherein the parameter item corresponds to a parameter of the target tissue, wherein the parameter is calculated based on at least two anatomical features;

obtaining a feature set including a plurality of anatomical features associated with the parameter item, wherein the plurality of anatomical features comprise one or more anatomical features existing in the target tissue and/or one or more of an anatomical reference line or anatomical reference position that is artificially defined for measurement of the target tissue; and

determining a position in the ultrasound image of each of the anatomical features in the feature set to obtain the measurement instruction, wherein the measurement instruction comprises a measurement sequence of the anatomical features;

automatically detecting, by the image processor, an inferoposterior margin of symphysis pubis and a central axis of symphysis pubis in the ultrasound image based on pattern recognition, wherein the automatically detecting comprises:

determining a starting point of the central axis of symphysis pubis according to the inferoposterior margin of symphysis pubis;

determining a candidate ray representing the central axis of symphysis pubis starting from the starting point, wherein the candidate ray has an initial deflection angle;

obtaining multiple candidate rays starting from the starting point in a predetermined range centered on the initial deflection angle in a predetermined angle interval;

extracting pixel characteristics of the multiple candidate rays; and

determining the central axis of symphysis pubis from the multiple candidate rays according to the pixel characteristics;

determining, by the image processor, a reference coordinate system based on the inferoposterior margin of symphysis pubis and the central axis of symphysis pubis, for performing the measurement instruction;

calculating, by the image processor, a parameter related to the target tissue according to the measurement instruction and based on the determined reference coordinate system to obtain a calculation result; and

outputting, by the image processor, the calculation result.

2. The method of claim 1 , wherein the target tissue comprises a pelvic floor tissue.

3. The method of claim 1 , wherein the ultrasound image comprises an anterior pelvic ultrasound image, a middle pelvic ultrasound image, or a posterior pelvic ultrasound image.

4. The method of claim 1 , wherein determining the position in the ultrasound image of each of the anatomical features in the feature set to obtain the measurement instruction comprises:

determining a determination order of the anatomical features in the feature set;

generating the measurement sequence based on the feature set and the determination order; and

sequentially determining the position of each of the anatomical features in the feature set according to the measurement sequence to obtain the measurement instruction.

5. The method of claim 1 , wherein determining the position in the ultrasound image of each of the anatomical features in the feature set to obtain the measurement instruction comprises:

receiving sequential determination operations of the user to the anatomical features in the feature set on the ultrasound image; and

obtaining the measurement instruction according to the determination operations inputted sequentially by the user, wherein the determination operations are orderly operations performed according to the measurement sequence.

6. The method of claim 4 , further comprising: prompting the feature set or the measurement sequence for displaying.

7. The method of claim 6 , wherein prompting the feature set or the measurement sequence comprises:

generating an anatomical schematic diagram of the target tissue based on knowledge of tissue anatomy, displaying the anatomical schematic diagram, and marking the anatomical features in the feature set or the measurement sequence on the anatomical schematic diagram.

8. The method of claim 1 , wherein outputting, by the image processor, the calculation result comprises:

displaying the calculation result after the calculation result of the parameter is obtained.

9. The method of claim 1 , wherein determining, by the image processor, the reference coordinate system comprises,

determining a first Cartesian coordinate system, by: determining that a 45-degree angle line of a second quadrant of the first Cartesian coordinate system is the central axis of symphysis pubis, and determining that the X axis of the first Cartesian coordinate system is at 45-degree angle from the central axis of symphysis pubis, and

determining a second Cartesian coordinate system, by: determining that the X axis of the second Cartesian coordinate system is the central axis of symphysis pubis.

10. The method of claim 1 , wherein, the feature set comprises at least an inferoposterior margin of symphysis pubis and a central axis of symphysis pubis.

11. The method of claim 4 , wherein generating the measurement sequence based on the feature set and the determination order comprises:

automatically generating a preset measurement sequence based on the feature set and the determination order;

displaying the preset measurement sequence;

receiving an editing instruction inputted by a user; and

updating the preset measurement sequence according to the editing instruction to obtain the measurement sequence.

12. The method of claim 9 , wherein determining the reference coordinate system further comprises:

receiving an inferoposterior margin of symphysis pubis and a central axis of symphysis pubis inputted by a user on the ultrasound image, and establishing the first Cartesian coordinate system or the second Cartesian coordinate system according to the input of the user.

13. The method of claim 12 , wherein automatically detecting the inferoposterior margin of symphysis pubis and the central axis of symphysis pubis in the ultrasound image based on the pattern recognition comprises:

inputting positive image samples containing inferoposterior margins of symphysis pubis and negative image samples not containing inferoposterior margins of symphysis pubis into a detector to perform a training;

obtaining a recognition model based on the training; and

automatically detecting the inferoposterior margin of symphysis pubis in the ultrasound image using the recognition model.

14. The method of claim 12 , wherein receiving the inferoposterior margin of symphysis pubis and the central axis of symphysis pubis inputted by the user on the ultrasound image comprises:

receiving a click input to determine the inferoposterior margin of symphysis pubis;

determining a starting point of a candidate center axis when a trackball or a mouse or a touch contact with a display screen starts moving; and

when the trackball, the mouse, or the touch contact with the display screen stops moving, determining an ending point of the candidate center axis as the central axis of symphysis pubis.

15. The method of claim 1 , wherein the ultrasound image comprises at least one of a rest frame image or a valsalva frame image.

16. The method of claim 1 , wherein,

the ultrasound image comprises a first frame of image and a second frame of image,

obtaining, by the image processor, the measurement instruction based on the ultrasound image comprises:

obtaining a first measurement instruction based on the first frame of image; and

obtaining a second measurement instruction based on the second frame of image;

calculating, by the image processor, a parameter related to the target tissue according to the measurement instruction and based on the determined reference coordinate system to obtain a calculation result comprises:

calculating the parameter according to the first measurement instruction to obtain a first calculation result;

calculating the parameter according to the second measurement instruction to obtain a second calculation result;

calculating a change of the second calculation result relative to the first calculation result; and

outputting the change.

17. The method of claim 1 , further comprising:

obtaining an evaluation level according to the calculation result; and

outputting the evaluation level, wherein the evaluation level comprises a number, a percentage, or an index.

18. The method of claim 17 , wherein obtaining the evaluation level according to the calculation result comprises at least one of:

receiving an adjustment from a user to an evaluation rule used for determining the evaluation level, adjusting the evaluation rule, and determining the evaluation level based on the calculation result according to the adjusted evaluation rule;

obtaining the evaluation level based on the calculation result according to a default evaluation rule, wherein the default evaluation rule is obtained by maximizing the calculation result of a specific parameter calculated on a specific frame; or

inputting multiple image samples, the calculation results of the parameters calculated on the image samples, and corresponding evaluation levels into a detector to perform a mathematical correlation analysis to obtain a machine model, and automatically obtaining the evaluation level according to the calculation result using the machine model.

19. An ultrasound imaging system, comprising:

a probe;

a transmitting circuit which excites the probe to transmit an ultrasonic beam to a target tissue through the probe;

a receiving circuit which receives ultrasonic echoes of the ultrasonic beam through the probe to obtain ultrasonic echo signals;

a processor which obtains an ultrasound image based on the ultrasound echo signals; and

a display which displays the ultrasound image; wherein

the processor further

obtains a measurement instruction based on the ultrasound image and according to a user input, by:

receiving a parameter item from the user input, wherein the parameter item corresponds to a parameter of the target tissue, wherein the parameter is calculated based on at least two anatomical features;

obtaining a feature set including a plurality of anatomical features associated with the parameter item, wherein the plurality of anatomical features comprise one or more anatomical features existing in the target tissue and/or one or more of an anatomical reference line or anatomical reference position that is artificially defined for measurement of the target tissue; and

determining a position in the ultrasound image of each of the anatomical features in the feature set to obtain the measurement instruction, wherein the measurement instruction comprises a measurement sequence of the anatomical features;

automatically detects an inferoposterior margin of symphysis pubis and a central axis of symphysis pubis in the ultrasound image based on pattern recognition, wherein the automatically detecting comprises:

determining a starting point of the central axis of symphysis pubis according to the inferoposterior margin of symphysis pubis;

determining a candidate ray representing the central axis of symphysis pubis starting from the starting point, wherein the candidate ray has an initial deflection angle;

obtaining multiple candidate rays starting from the starting point in a predetermined range centered on the initial deflection angle in a predetermined angle interval;

extracting pixel characteristics of the multiple candidate rays; and

determining the central axis of symphysis pubis from the multiple candidate rays according to the pixel characteristics;

determines a reference coordinate system based on the inferoposterior margin of symphysis pubis and the central axis of symphysis pubis, for performing the measurement instruction;

calculates a parameter related to the target tissue according to the measurement instruction and based on the determined reference coordinate system to obtain a calculation result; and

outputs the calculation result.