Korean J Radiol.  2008 Apr;9(2):134-139. 10.3348/kjr.2008.9.2.134.

Correlations between the Various Methods of Estimating Prostate Volume: Transabdominal, Transrectal, and Three-Dimensional US

Affiliations
  • 1Department of Radiology, DongGuk University International Hospital, Goyang, Korea. kimsh@duih.org
  • 2Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.

Abstract


OBJECTIVE
To evaluate the correlations between prostate volumes estimated by transabdominal, transrectal, and three-dimensional US and the factors affecting the differences. MATERIALS AND METHODS: The prostate volumes of 94 consecutive patients were measured by both transabdominal and transrectal US. Next, the prostate volumes of 58 other patients was measured by both transrectal and three-dimensional US. We evaluated the degree of correlation and mean difference in each comparison. We also analyzed possible factors affecting the differences, such as the experiences of examiners in transrectal US, bladder volume, and prostate volume. RESULTS: In the comparison of transabdominal and transrectal US methods, the mean difference was 8.4 +/- 10.5 mL and correlation coefficient (r) was 0.775 (p < 0.01). The experienced examiner for the transrectal US method had the highest correlation (r = 0.967) and the significantly smallest difference (5.4 +/- 3.9 mL) compared to the other examiners (the beginner and the trained; p < 0.05). Prostate volume measured by transrectal US showed a weak correlation with the difference (r = 0.360, p < 0.05). Bladder volume did not show significant correlation with the difference (r = -0.043, p > 0.05). The comparison between the transrectal and three-dimensional US methods revealed a mean difference of 3.7 +/- 3.4 mL and the correlation coefficient was 0.924 for the experienced examiner. Furthermore, no significant difference existed between examiners (p > 0.05). Prostate volume measured by transrectal US showed a positive correlation with the difference for the beginner only (r = 0.405, p < 0.05). CONCLUSION: In the prostate volume estimation by US, experience in transrectal US is important in the correlation with transabdominal US, but not with three-dimensional US. Also, less experienced examiners' assessment of the prostate volume can be affected by prostate volume itself.

Keyword

Prostate, US; Ultrasound (US), three-dimensional; Ultrasound (US), technology

MeSH Terms

Adult
Aged
Clinical Competence
Humans
*Imaging, Three-Dimensional
Male
Middle Aged
Prostate/*ultrasonography
Ultrasonography/*methods
Urinary Bladder/ultrasonography

Figure

  • Fig. 1 Measurement of craniocaudal length of prostate on US. Craniocaudal length of prostate (between crosses) is measured on transabdominal US (A) and transrectal US (B) at mid-sagittal plane.

  • Fig. 2 Prostate volume measurement by 3DUS (VOCAL™). A. In any plane, trace outer margin of prostate (dotted line). B. Image rotates along axis (between arrowheads) by 60°, then outline again. C. Steps A and B are repeated until rotation reaches 360°, followed by 3D image of prostate in surface rendering mode; calculated volumes are displayed.


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