Analysis of Three Main Error Sources in Traditional Bladder Volume Formula and Development of a Computer Bladder Volume Calculation Program

This study analyzed three main sources of error in bladder volume calculation by traditional ultrasound bladder volume formula, which is most commonly used in clinic and built into most ultrasonic diagnostic apparatus. In order to solve these errors, we changed the traditional bladder volume formula to calculate bladder volume based on bladder axis to calculate volume based on bladder Section area, and corrected this formula according to actual clinical data to obtain a new formula, which is called the modified ellipsoidal trend formula. This formula can easily calculate the bladder volume manually during ultrasound examination of the bladder. Based on this formula, OpenCV function is applied to build a program for calculating bladder volume through two ultrasound images of bladder. The method is to calculate the total number of pixels in the contour of the bladder image by the program, and convert the number of pixels to area, and calculate the bladder volume using the modified ellipsoidal trend formula. This algorithm can be implanted into Ultrasonic diagnostic apparatus or ultrasound workstation to replace the traditional bladder volume formula. In this study, 122 ultrasound cases were used to test the accuracy of the program, and the results showed that the program was more accurate than the traditional bladder volume formula.