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Impact of Bent Distortion on Accuracy of Measurement During Transrectal Ultrasonography for Prostatic Imaging: A Preliminary Study

Authors
 Hyung Ho Lee ; Joo Yong Lee ; Kang Su Cho ; Young Deuk Choi ; Koon Ho Rha ; Won Sik Ham ; Richilda Red Diaz ; Ho Song Yu 
Citation
 Urology, Vol.81(4) : 915~919, 2013 
Journal Title
 Urology 
ISSN
 0090-4295 
Issue Date
2013
Abstract
OBJECTIVE: To evaluate the effect of bent distortion of the image of the prostate on the accuracy of 3-dimensional measurements during transrectal ultrasonography (TRUS). METHODS: TRUS images were obtained prospectively from 60 patients with prostate cancer. The degree of rectal compression on the probe was varied in each case to obtain a typical bent distortion image (BDI) and a minimally bent image (MBI). Magnetic resonance imaging (MRI) served as the reference. Axial and midsagittal BDI, MDI, and MRI were selected. Three-dimensional prostate diameters (height, width, and length) and volume were obtained from all images by 2 independent observers. The data were analyzed by using a paired t test, intraclass correlation coefficients (ICCs), and Bland-Altman plots. RESULTS: The MBI and BDI diameters differed significantly (P <.001). All ICCs for the MBI diameters and volume and the ICCs for BDI length and volume exceeded 0.9, which indicates high measurement reliability. However, the ICCs for BDI height and width were below 0.9. When the difference in MBI or BDI relative to MRI was calculated for each variable, the MBI differences were all significantly smaller than the BDI differences (P <.001). CONCLUSION: Bent distortion during TRUS affects the accuracy of measurements. MBI is also morphologically more realistic than BDI. Therefore, to minimize prostatic image distortion, the rectal probe should be placed so that the posterior wall of the prostate is as flat as possible.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/86931
DOI
10.1016/j.urology.2012.12.020
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Urology
Yonsei Authors
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Link
 http://www.sciencedirect.com/science/article/pii/S0090429512015622
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