Echogenicity quantification method and calibration method for ultrasonic device using echogenicity index
First Claim
1. An echogenicity quantification method, comprising:
- receiving an ultrasound image by an ultrasonic imaging device, and the ultrasound image comprises a plurality of pixel points, each pixel point has a grayscale value;
choosing a region of interest (ROI) In the ultrasound image;
averaging the grayscale values of the pixel points in the ROI to obtain an average value of the ROI and calculating the grayscale scale values of the pixel points in the ROI to obtain a standard deviation of the ROI;
excluding the pixel points with the grayscale values smaller than the sum of the minimum value in the grayscale image and the product of a first scaling factor of a first constant and the standard deviation of the ROI from the ROI;
wherein the first scaling factor is predetermined;
excluding the pixel points with the grayscale values larger than the sum of the average value of the ROI and the product of a second scaling factor of a second constant and the standard deviation of the ROI from the ROI;
wherein the second scaling factor is predetermined;
averaging the grayscale values of the remaining pixel points in the ROI to obtain an average value of interest;
choosing a reference region which is nonoverlapped with the ROI in the ultrasound image;
averaging the grayscale values of the remaining pixel points in the reference region to obtain an average value of reference;
calculating the difference between the average value of interest and the average value of reference to obtain an echogenicity index by a computing device;
setting the grayscale values of an image area outside the ROI to a background value which is related with visual sensitivity by a display device; and
setting the grayscale values of the pixel points within the ROI to a value, wherein the value is the product of the background value and the average value of interest divided by the average value of reference by the display device.
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Abstract
An echogenicity quantification method and a calibration method for ultrasonic device using echogenicity index are disclosed. The method includes: receiving an ultrasound image which comprises a plurality of grayscale pixels; choosing a region of interest (ROI); calculating the values of the grayscale pixels in ROI to obtain average value and standard deviation; excluding pixels in ROI with the grayscale value smaller than the sum of the minimum value in the grayscale image and the product of a first scaling factor and the standard deviation, and larger than the sum of the average value and the product of a second scaling factor and the standard deviation; averaging the values of the remaining grayscale pixels in ROI to obtain an average value of interest; choosing a reference region; averaging the values of the remaining grayscale pixels in the reference region to obtain an average value of reference; and calculating the difference between the average value of interest and the average value of reference to obtain an echogenicity index.
32 Citations
16 Claims
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1. An echogenicity quantification method, comprising:
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receiving an ultrasound image by an ultrasonic imaging device, and the ultrasound image comprises a plurality of pixel points, each pixel point has a grayscale value; choosing a region of interest (ROI) In the ultrasound image; averaging the grayscale values of the pixel points in the ROI to obtain an average value of the ROI and calculating the grayscale scale values of the pixel points in the ROI to obtain a standard deviation of the ROI; excluding the pixel points with the grayscale values smaller than the sum of the minimum value in the grayscale image and the product of a first scaling factor of a first constant and the standard deviation of the ROI from the ROI;
wherein the first scaling factor is predetermined;excluding the pixel points with the grayscale values larger than the sum of the average value of the ROI and the product of a second scaling factor of a second constant and the standard deviation of the ROI from the ROI;
wherein the second scaling factor is predetermined;averaging the grayscale values of the remaining pixel points in the ROI to obtain an average value of interest; choosing a reference region which is nonoverlapped with the ROI in the ultrasound image; averaging the grayscale values of the remaining pixel points in the reference region to obtain an average value of reference; calculating the difference between the average value of interest and the average value of reference to obtain an echogenicity index by a computing device; setting the grayscale values of an image area outside the ROI to a background value which is related with visual sensitivity by a display device; and setting the grayscale values of the pixel points within the ROI to a value, wherein the value is the product of the background value and the average value of interest divided by the average value of reference by the display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An echogenicity quantification system, comprising:
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an ultrasonic imaging device for receiving an ultrasound image, and the ultrasound image comprises a plurality of pixel points, each pixel point has a grayscale value; an analyzing device of a region of interest (ROI) connects to the ultrasonic imaging device for choosing a region of interest (ROI) in the ultrasound image;
averaging the grayscale values of the pixel points in the ROI to obtain an average value of the ROI and calculating the grayscale scale values of the pixel points in the ROI to obtain a standard deviation of the ROI;
excluding the pixel points with the grayscale values smaller than the sum of the minimum value in the grayscale image and the product of a first scaling factor of a first constant and the standard deviation of the ROI from the ROI;
excluding the pixel points with the grayscale values larger than the sum of the average value of the ROI and the product of a second scaling factor of a second constant and the standard deviation of the ROI from the ROI; and
averaging the grayscale values of the remaining pixel points in the ROI to obtain an average value of interest;
wherein the first scaling factor and the second scaling factor are predetermined;an analyzing device of a reference region connects to the ultrasonic imaging device for choosing a reference region which is nonoverlapped with the ROI in the ultrasound image; and
averaging the grayscale values of the remaining pixel points in the reference region to obtain an average value of reference;a computing device connects to the analyzing device of the ROI and the analyzing device of the reference region for calculating the difference between the average value of interest and the average value of reference to obtain an echogenicity index; and a display device connects to the computing device for setting the grayscale values of the an image area outside the ROI to a background value which is related with visual sensitivity;
setting the grayscale values of the pixel points within the ROI to a value, wherein the value is the product of the background value and the average value of interest divided by the average value of reference. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification