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KMID : 0861420100140020117
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Korean Journal of Nuclear Medicine Technology
2010 Volume.14 No. 2 p.117 ~ p.121
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The Quantitative Assessment of Renal Function and Size by Differences of Acquisition Counts in 99mTc-DMSA Renal Scan
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Shim Dong-Oh
Kim Ho-Seong
Jung Eun-Mi
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Abstract
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Purpose: In nuclear medicine study, there are two methods, preset count method and preset time method, to acquire static images. We usually use preset count method for static image in 99mTc-DMSA renal scan, but occasionally use preset time method. In case of using preset count method, we always acquire same counts but it causes a difference of scan time. In case of using preset time method, it takes same scan time to acquire images but it causes different counts. Therefore, the purpose of this study is to investigate any differences of function and formal information in both kidney by acquisition counts
Materials and Methods: From January 11, 2010 to March 31, 2010, we analyzed the 30 patients (M: 11, W: 19). who were examined by 99mTc-DMSA scan and have one side of functioning kidney relatively between 40~60%. And the patients who have cold and hot region in image were analyzed but we did not accept images of patients when it was hard to divide kidney into cortex. There was no division between subjects and age of subjects is 14.83±22.07 old. We used the BrightView gamma camera from PHILIPS. To analyze function and formal of kidney, we used JET stream release 3.0 version from PHILIPS. Using SPSS 12.0 program, we compared descriptive statistics and paired T-test. Images were acquired sequentially in the same parameters, but there are three methods which different from acquisition time and scan
time, 100 kcounts, 300 kcounts and 7 minutes method (exceed 300 kcounts). To assess function and formal information of kidney, we measured renal relative function, geometric mean and size of kidney and analyzed each difference.
Results: In case of renal relative function in both kidney, 100 kcounts method was 50.52±3.64%. 300 kcounts method was 50.38±3.66% and 7 minutes method was 49.91±3.40% and there were no statistical significant differences between each method. In case of geometric mean, 100 kcounts method was 50.08±3.25%. 300 kcounts method was 49.89±3.40% and 7 minutes method was 49.91±3.24%. And also, there were no statistical significant differences. When comparing size of kidney, 100 kcounts method was 8.23±1.96 cm. 300 kcounts method was 8.12±1.90 cm and 7 minutes method was 8.35±1.97 cm. In case of right kidney, 100 kcounts method was 7.91±1.88 cm. 300 kcounts method was 8.12±1.90 cm and 7 minutes method was 8.25±1.96 cm. From those values, we recognized that there were significant differences each method (p<0.05).
Conclusion: From results of this study, there were no statistical differences in renal relative function and geometric mean by acquisition counts. However, in shape of kidney, the more acquisition counts are increasing, the more size of kidney is getting big. And there were statistical significant differences. Therefore, to perform reliable quantitative result, preset count method is more desirable than preset time method. Especially, in case of a follow-up test, if we use preset time method, it will cause differences of formal results in kidney due to acquisition counts each time we examine patients.
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KEYWORD
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{99mTc-DMSA , preset count , preset time , renal relative function
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