The estimation of bladder volume by sonocystography.

Area of Science:

• Medical Imaging
• Urology
• Diagnostic Techniques

Background:

• Accurate bladder volume measurement is crucial for clinical assessment.
• Traditional methods like catheterization can be invasive.
• Non-invasive ultrasonography offers a potential alternative.

Purpose of the Study:

• To evaluate the accuracy of ultrasonography for measuring bladder volumes.
• To compare different calculation methods using bladder diameters.
• To determine the reliability and limitations of ultrasound bladder volume estimation.

Main Methods:

• Real-time ultrasonography was employed to capture bladder dimensions.
• Bladder volumes were calculated using three internal diameters (height, width, depth).
• Calculated volumes were compared against true volumes obtained via voided volume or catheterization.

Main Results:

• A good correlation between calculated and true bladder volumes was achieved with a 0.6 correction factor.
• A simplified 2-diameter method with a 0.15 correction factor showed comparable reliability.
• The quantitative ultrasound method demonstrated an average error of ±25% for bladder volumes between 100-500 ml.

Conclusions:

• Ultrasonography provides a reliable, non-invasive method for estimating bladder volumes within a specific range.
• Accuracy is limited for volumes below 100 ml, with qualitative assessment recommended.
• False negatives were frequent for bladder volumes under 50 ml, highlighting limitations in detecting small volumes.