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KMID : 1143620150190010037
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Korean Journal of Nuclear Medicine Technology
2015 Volume.19 No. 1 p.37 ~ p.43
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Study on the Usefulness of Using Anterior and Posterior Views for Calculation of Total Relative Uptake Ratio in 99mTc-DMSA Renal Scan
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Kim Joo-Yeon
Lee Han-Wool
Kwon Oh-Jun
Kim Jung-Yul
Park Min-Soo
Cho Seok-Won
Kang Chun-Koo
Kim Jae-Sam
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Abstract
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Purpose: 99mTc-DMSA renal scintigraphy serves as location, size and shape of kidney, so it has been used for diagnosis and passage observation after the operation or treatment. There are 3 methods of calculating the relative renal uptake ratio such as geometric mean of the counts from the anterior and posterior views, arithmetical mean from the only
posterior view and posterior view which applied the renal depths. In this study, we seek to correlation between the change of total relative uptake ratio according to different inspection methods of obtaining the renal count rate.
Materials and Methods : The phantom experiments proceeded 5 times depending on each renal depth with the kidney phantom and tissue equivalent materials. In the clinical research, we investigated 36 adult patients who had visited our hospital from february to october, 2014 and received 99mTc-DMSA renal scan. The equipment was used as a gamma camera named INFINIA (General Electric Healthcare, milwaukee, USA) and we drew the region of interests through semiautomatic method by using Xeleris Ver. 2.1220 of GE. In addition, we obtained the lateral view of kidney to measure the renal depth of each patient. Then the results were compared with 3 methods of calculating relative renal uptake ratio.
Results : The phantom studies show when the difference between the left ant right kidney depth were less than 1 cm, there were no statistically significant difference among values calculated through anterior and posterior views and
only posterior view (P>0.05), while the excess of 1cm, the results showed a statistically significant change in the value (P<0.05). In case of clinical research, the correlation between total relative uptake ratio by obtaining both sides of image and posterior view applied the kidney depth (r=0.999) was higher than by obtaining only posterior view and applying the kidney depth to one side image (r=0.988).
Conclusion : This study has found that, the difference of calculating total relative uptake ratio compared with obtaining
anterior and posterior views and only posterior view. In order to reduce the error, we recommend the method of obtaining anterior and posterior views and is considered to be useful, particularly the patients have similar uptake ratio of left and right kidney and difficulties of measurements of kidney depth.
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KEYWORD
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total relative uptake ratio, geometric mean, renal depth, posterior view, anterior and posterior views
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