膀大小和形状对膀体积评估配方方法准确性的影响
Jintao Shen1,2, Yaqi Zuo2, Jing Song2
1Department of Urology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China.
International urology and nephrology
|September 23, 2024
概括
估计膀体积的公式方法对于较小的膀和某些形状来说不太准确. 圆形和三角形的膀形状在这种配方方法中显示出更高的准确性.
科学领域:
- 泌尿器科 泌尿器科 泌尿器科 泌尿器科
- 医疗成像医学成像
- 计算解剖学的计算解剖学
背景情况:
- 膀体积的估计对于临床诊断和治疗至关重要.
- 公式方法 (V = 0.52 × d1 × d2 × d3) 是估计膀体积的常用技术.
- 影响公式方法准确性的因素需要进一步调查.
研究的目的:
- 评估膀大小和形状对膀体积评估公式方法准确性的影响.
- 将公式方法的结果与从3D Slicer软件获得的参考标准进行比较.
主要方法:
- 对220名没有膀疾病的患者CT图像的回顾性分析.
- 使用3D Slicer软件 (参考VA) 和公式方法 (VB) 测量膀体积.
- 比较VA和VB,按膀大小和形状分层.
主要成果:
- 与3D Slicer相比,公式方法显示了统计学上显著的差异 (P < 0.0001).
- 平均百分比偏差因膀大小而异:18.8% (小),3.4% (中等) 和4.6% (大).
- 公式方法低估了圆,矩形和不规则形状的体积,分别有9.7%,12.9%和14.4%的偏差. 圆形和三角形形状没有显著差异.
结论:
- 膀的大小和形状显著影响体积估计公式方法的准确性.
- 配方方法倾向于低估膀体积,在较小的膀中错误更大.
- 使用公式方法观察到圆形和三角形膀形状的高精度.
相关概念视频
Glassware Calibration
205
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
205
Accuracy, limits, and approximation
443
Accuracy, limits, and approximations are common in many fields, especially in engineering calculations. These concepts are imperative for ensuring that a given value is as close as possible to its true value.
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
443
Theorems of Pappus and Guldinus: Problem Solving
711
Pappus and Guldinus's theorems are powerful mathematical principles that are used for finding the surface area and volume of composite shapes. For example, consider a cylindrical storage tank with a conical top. Finding the surface area or volume can be challenging for such complex shapes. These theorems are particularly useful in calculating the volume and surface area of such systems. Here, the cylindrical storage tank with a conical top can be broken down into two simple shapes: a...
711
Pipe Flowrate Measurement
502
In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
The orifice meter is a simple,...
502
Uncertainty in Measurement: Accuracy and Precision
73.5K
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
73.5K
Typical Model Studies
344
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
344


