A Prospective Comparative Study on Bladder Volume Measurement in Patients with Pelvic Tumor Undergoing Radiotherapy: Portable Bladder Scanner from China versus CT Analog Positioning Machine

Abstract

Abstract Objective The purpose of this study was to investigate whether the bladder volume of patients with pelvic tumor treated with radiotherapycan be accurately measured using the Meike Palm Bladder Scanner PBSV3.2 manufactured in China and the accuracy of its measurement under different influencing factors. Methods To compare the consistency of treatment planned CT bladder volume and bladder volume measured by PBSV3.2 in 165 patients with pelvic radiotherapy tumors. To investigate the accuracy of PBSV3.2 in different sex, age, treatment purpose, and bladder volume. Results There was a significant positive correlation with bladder volume on CT and PBSV3.2 (r=0.874; p<0.001). The mean difference between CT measured values and PBSV3.2 was (-0.14±50.17) ml. The results of the different variables showed that the overall mean of PBSV3.2 and CT measurements were statistically different in the age ≥65 years, bladder volumes >400ml and ≤400ml groups (p = 0.028, 0.002, 0.001). There was no statistical significance between the remaining variables. The volume difference between PBSV3.2 measurement and CT was 12.87ml in male patients, which was larger than that in female patients 3.27ml. Pearson correlation analysis showed that the correlation coefficient was 0.473 for bladder volume greater than 400ml and 0.868 for bladder volume less than 400ml; the correlation coefficient of the other variables ranged from 0.802 to 0.893. Conclusion This is the first large-sample study to evaluate the accuracy of PBSV3.2 in a pelvic tumor radiotherapy population using the convenient bladder scanner PBSV3.2 made in China. PBSV3.2 provides an acceptable indicator for monitoring bladder volume in patients with pelvic radiotherapy. It is recommended to monitor bladder volume with PBSV3.2 when the planned bladder volume is 200-400ml. For male and patients ≥65 years old, at least two repeat measurements are required when using a bladder scanner and the volume should be corrected by using a modified feature to improve bladder volume consistency.