Korean J Radiol.  2000 Jun;1(2):110-113. 10.3348/kjr.2000.1.2.110.

Prostate Volume Measurement by TRUS Using Heights Obtained by Transaxial and Midsagittal Scanning : Comparison with Specimen Volume Following Radical Prostatectomy

• Park SB
• Kim JK
• Choi SH
• Noh HN
• Ji EK
• Cho KS

• KMID: 966482
• DOI: http://doi.org/10.3348/kjr.2000.1.2.110

Abstract

OBJECTIVE
The purpose of this study was to determine, when measuring prostate volume by TRUS, whether height is more accurately determined by transaxial or midsagittal scanning. MATERIALS AND METHODS: Sixteen patients who between March 1995 and March 1998 underwent both preoperative TRUS and radical prostatectomy for prostate cancer were included in this study. Using prolate ellipse volume calculation (height x length x width x pi/6), TRUS prostate volume was determined, and was compared with the measured volume of the specimen. RESULTS: Prostate volume measured by TRUS, regardless of whether height was determined transaxially or midsagittally, correlated closely with real specimen volume. When height was measured in one of these planes, a paired t test revealed no significant difference between TRUS prostate volume and real specimen volume (p = .411 and p = .740, respectively), nor were there significant differences between the findings of transaxial and midsagittal scanning (p = .570). A paired sample test, however, indicated that TRUS prostate volumes determined transaxially showed a higher correlation coefficient (0.833) and a lower standard deviation (9.04) than those determined midsagittally (0.714 and 11.48, respectively). CONCLUSION: Prostate volume measured by TRUS closely correlates with real prostate volume. Furthermore, we suggest that when measuring prostate volume in this way, height is more accurately determined by transaxial than by midsagittal scanning.

Keyword

Prostate, US; Prostate, hypertrophy; Ultrasound (US), technology

MeSH Terms

Human
Male
Middle Age
Prostate/*pathology/*ultrasonography
Prostatectomy
Prostatic Neoplasms/pathology/surgery/*ultrasonography

Figure

• 

  Fig. 1 Measurement of prostate volume by TRUS A. Height (arrow) was measured by transaxial scanning (3.15 cm), and prostate volume was calculated as 36.1 cc. B. Height (arrow) was measured by midsagittal scanning (3.35 cm), and prostate volume was calculated as 35.0 cc. Specimen volume was 45.81 cc.

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  Fig. 2 Correlation between prostate volume measured by TRUS and real prostate volume measured after radical prostatectomy. When height was determined transaxially rather than midsagitally, prostate volumes measured by TRUS showed higher correlation coefficient (0.833 vs 0.714).

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