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KMID : 0390320160260020023
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Chungbuk Medical Journal
2016 Volume.26 No. 2 p.23 ~ p.30
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The Measurement of Ureteral Stone is Affected by the Differences in Measurement Methods by Using Computed Tomography Imaging
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Cho Bum-Sang
Park Kil -Sun
Han Heon-Seok
Lee Jin-Yong
Baek Soon-Cheol
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Abstract
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Purpose: The purposes of present study are to examine whether measurements differ by comparing the sizes of stones measured in the axial and coronal CT images - the most popular planes for diagnosis of stones - and to determine whether the location of the stone contributes to such differences in measurement.
Materials and Methods: A total of 147 patients (male:female 99:48, mean age 45.4 years, age range 12-81 years) who were diagnosed with ureteral stones via CT findings at our hospital between February 2010 to June 2010 were examined. Three of these patients had more than 2 ureteral stones, resulting in a total of 152 stones for study. The sizes of stones were measured each via the axial and coronal CT image. The locations of stones were divided into upper ureter, middle ureter, and lower ureter; particularly for the lower ureter, the ureterovesical junction was recorded as a separate location, as many stones were found in this location. We investigated whether the sizes of the measured stones varied depending on the location. A paired t-test was performed on the measurements taken with the axial and coronal images, and the differences and distribution of the changes in accordance with stone location were examined.
Results: The average stone size in the axial plane was 4.68±1.91 mm (range; 1.23 mm ~ 10.38 mm), and that in the coronal plane was 5.22±2.49 mm (range; 1.94 mm ~ 15.70 mm) with a statistically significant difference between the two groups (p<0.001). Sixty-three stones in total were found in the upper ureter. Fifty-three of them were larger in the coronal plane, while 10 were measured larger in the axial plane with a significant difference in the average sizes. There were no significant differences between the axial and coronal planes in the size of stones found in locations other than the upper ureter.
Conclusions: When upper and lower ureteral stones are found in an axial image, the size of stones should be measured in both the axial and coronal planes. However, stones in the mid-ureter and ureterovesical junction are found in an axial image, the size measured in the axial image could be used.
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KEYWORD
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Computed tomography, Calculi, Ureter, location, section
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