Department of Radiation Oncology, Chongqing University Cancer Hospital & Chongqing Cancer Institute & Chongqing Cancer Hospital, Chongqing, People's Republic of China.
Department of Radiation Oncology, Chongqing University Three Gorges Hospital/Chongqing Three Gorges Central Hospital, Chongqing, People's Republic of China.
Cancer Control. 2021 Jan-Dec;28:10732748211021082. doi: 10.1177/10732748211021082.
Continuous surveillance of bladder volume (BV) is beneficial during the treatment of various urogenital diseases because the bladder is always changing its position, size and even shape at different filling phases. For this purpose, we quantified the motion of the urinary bladder.
Daily ultrasound measurements and weekly cone-beam computed tomography scans were obtained from 89 patients in the supine position. BV, bladder centroid positions, and triaxial lengths in the left-right (LR), anterior-posterior (AP), and superior-inferior (SI) directions were compared across different time points.
BV linearly increased over time, and the mean urinary filling rate () was correlated with the patients' age and water consumption. The greatest bladder centroid motion occurred longitudinally, with less movement observed laterally. The maximum bladder centroid movement was 18.8 ± 2.2 mm inferiorly and 1.8 ± 0.9 mm posteriorly for every 10% decrease in BV. The rates of changes in triaxial lengths differed across the 4 filling phases. The rate was the largest at a BV range of 10-80 mL, especially in the LR direction, with values of 5.9 ± 1.0, 3.6 ± 1.0, and 3.9 ± 1.0 mm per every 10-mL BV increase for LR, AP, and SI, respectively. With bladder filling (<80 mL), the maximum increase in triaxial length was observed in the SI direction and the rates of all changes considerably decreased, especially at BV > 600 mL.
The could be used to evaluate the temporal changes in the bladder. The spatial changes should be assessed according to different filling phases based on the centroid position and triaxial lengths.
在治疗各种泌尿生殖系统疾病时，持续监测膀胱容量（BV）是有益的，因为膀胱在不同的充盈阶段总是在改变其位置、大小甚至形状。为此，我们对膀胱的运动进行了量化。
对 89 例仰卧位患者进行每日超声测量和每周锥形束 CT 扫描。比较了不同时间点的 BV、膀胱中心点位置以及在左右（LR）、前后（AP）和上下（SI）方向上的三轴长度。
BV 随时间呈线性增加，平均尿液充盈率（）与患者的年龄和饮水量相关。膀胱中心点的最大运动发生在纵向，横向运动较少。每 10%的 BV 减少，膀胱中心点的最大移动距离为 18.8 ± 2.2mm 向下和 1.8 ± 0.9mm 向后。三轴长度的变化率在 4 个充盈阶段有所不同。在 BV 范围为 10-80mL 时，变化率最大，尤其是在 LR 方向，LR、AP 和 SI 方向的每 10mL BV 增加分别为 5.9 ± 1.0、3.6 ± 1.0 和 3.9 ± 1.0mm。随着膀胱充盈（<80mL），在 SI 方向上观察到三轴长度的最大增加，并且所有变化的速率都大大降低，尤其是在 BV>600mL 时。
可以使用来评估膀胱的时间变化。应根据充盈阶段的不同，基于中心点位置和三轴长度来评估空间变化。
