Korean J Urol.  2006 Dec;47(12):1320-1326. 10.4111/kju.2006.47.12.1320.

The Accuracy and Diagnostic Value of Three-Dimensional Portable Bladder Volume Measurement System in the Measurement of Bladder Volume according to the Different Angling of Ultrasound Transducer

• Kim YJ
• Lee HJ
• Lee T

• KMID: 2139778
• DOI: http://doi.org/10.4111/kju.2006.47.12.1320

Abstract

PURPOSE
The accuracy and reliability of a three-dimensional portable ultrasound bladder volume measurement system (BVMS), under two different angles (90degrees or 60degrees from cranial abdomen), for estimating the bladder volume was assessed. MATERIALS: Ultrasonographic studies of the bladder volume, using a newly developed portable (2.4 kg) BVMS (BioCon-500, Mcube Technology, Korea), with real bladder images, were conducted on 154 patients (29-77 years old; M:F=116:38), at angles of 90 and 60 degrees, on the abdomen 2 cm above the symphysis pubis. This ultrasound-estimated volume was compared with the immediately catheterized volume. Comparison of BVMS estimated volumes with the catheterized volumes was performed according to the angles using the Pearson correlation coefficient, intra-class correlation coefficient (ICC) concordance and fractional absolute error (FAE).
RESULTS
Good agreement between the BVMS estimated and catheterized volumes was found for both angles (60: r=0.986, p<0.001, ICC=0.965; 90degrees : r=0.931, p<0.001, ICC=0.992). Although this was not significant, the linear correlation of the 60 degree estimation values seems to be higher than for those obtained at 90 degree's. Various factors, such as age, sex, body mass index (BMI) and diagnosis, showed no correlation with the difference between the catheterized and BVMS estimated bladder volumes.
CONCLUSIONS
Volume estimation using this BVMS is recommended as an alternative to catheterization for the determination of the bladder volumes both before and after voiding. The volume estimation of the transducer at 60 degrees, rather than that at 90 degrees, is recommended due to the field of view (FOV) limitation on ultrasound. However, these results demonstrate the need to standardize these procedures for volume estimations using BVMS.

Keyword

Bladder; Ultrasonography; Urine; Reliability and validity

MeSH Terms

Abdomen
Body Mass Index
Catheterization
Catheters
Diagnosis
Humans
Reproducibility of Results
Transducers*
Ultrasonography*
Urinary Bladder*

Figure

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  Fig. 1 Three dimensional integration process. Activating the scanning probe (A) generates 12 images, each at 15 degree angles to the adjacent image (B).

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  Fig. 2 The definition of ultrasonic transducer angulation and the display panel showing the actual bladder images according to the angulation. (A) 90 degree angulation. (B) Display panel of 90 degree scanning. (C) 60 Degree angulation. (D) Display panel of 60 degree scanning. Twelve images acquired in twelve planes are included in the volume determination using an integration process.

• 

  Fig. 3 Scattergram of catheter versus scan volumes, with 60 (A) and 90 (B) degrees. The two volumes are correlated at both 60 and 90 degrees (p<0.001), although the scan volume is consistent. USG: ultrasonography, ICC: intra-class correlation coefficient.

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  Fig. 4 Scattergram of the ultrasound estimated urine volume by two different medical staff at 60 and 90 degrees. USG: ultrasonography, ICC: intra-class correlation coefficient.

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