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KMID : 0357520160390020199
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Journal of Radiological Science and Technology
2016 Volume.39 No. 2 p.199 ~ p.208
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Utility Evaluation on Application of Geometric Mean Depending on Depth of Kidney in Split Renal Function Test Using 99mTc-MAG3
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Lee Eun-Byeul
Lee Wang-Hui
Ahn Sung-Min
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Abstract
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99mTc-MAG3 Renal scan is a method that acquires dynamic renal scan image by using 99mTc-MAG3 and dynamically visualizes process of radioactive agent being absorbed to kidney and excreted continuously. Once the test starts, ratio in both kidneys in 1~2.5 minutes was measured to obtain split renal function and split renal function can be expressed in ratio based on overall renal function. This study is based on compares split renal function obtained from data acquired from posterior detector, which is a conventional renal function test method, with split renal function acquired from the geometric mean of values obtained from anterior and posterior detectors, and studies utility of attenuation compensation depending on difference in geometric mean kidney depth. From July, 2015 to February 2016, 33 patients who undertook 99mTc-MAG3 Renal scan(13 male, 20 female, average age of 44.66 with range of 5~70, average height of 160.40cm, average weight of 55.40kg) were selected as subjects. Depth of kidney was shown to be 65.82 mm at average for left and 71.62 mm at average for right. In supine position, 30 out of 33 patients showed higher ratio of deep-situated kidney and lower ratio of shallow-situated kidney. Such result is deemed to be due to correction by attenuation between deep-situated kidney and detector and in case where there is difference between the depth of both kidneys such as, lesions in or
around kidney, spine malformation, and ectopic kidney, ratio of deep-situated kidney must be compensated for more accurate calculation of split renal function, when compared to the conventional test method (posterior detector counting).
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KEYWORD
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MAG3, Geometric Mean,
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