Differential GFR estimation of the double moiety kidneys by modified GATE’S formula
Aim: This retrospective analysis of the GFR values of the individual moieties obtained by using a novel software with modified GATE’S formula in the in house software created at SSSIHL, compared and evaluated with the value derived by the combined GFR value of the single kidney GFR as obtained from the Icon software loaded in the gamma camera. Materials and Method: This retrospective study of 10patients diagnosed with unilateral double moiety and 5 patients with bilateral duplication was undertaken to validate the modified GATE’S formula in house software created at SSSIHL. This group had 12 males in the age range of 03-66 years with the mean age of 26.5 ± 2 years and 3 females in the age range of 29 – 31 years with mean age of 31 ± 2 years. Renal scans were done using Siemens dual head gamma camera (E.CAM). The radiopharmaceutical 99mTc-DTPA 5 mCi was injected as a bolus intravenously for the adult patients and 3 mCi was injected for the children. The images were obtained and processed by using GFR/Renal differential processing protocol in icon software. Later the raw data of the scan study transferred to the workstation loaded with the in house software created at SSSIHL with modified GATE’S formula created by us. The individual moiety GFR values were calculated using the software with modified Gate’s formula developed in MATLAB GUI algorithm and tabulated. Then the combined value of individual moiety GFR values compared with that of the individual whole kidney GFR value obtained by the Icon software protocol. Result: The T test evaluation done in the online statistical calculator of Maths Portal org revealed that the mean values of the two groups showed no significant difference at p < 0.05. The calculated t value is smaller than the critical value (0.0217 < 2.024), so the means are not significantly different. Pearson Correlation performed between the above two samples using statistical online calculators also showed the correlation coefficient of r = 0.9247 and a mean difference of 0.09 indicating that the high correlation between them. The observed significance p value < 0.0001 at t value of 10.27, showed no significant difference detected between the two samples. Conclusion: It can be concluded that the in house software created at SSSIHL with modified GATE’S formula method of GFR calculating software showed identical values with that of the GFR calculated with the original Gate’s formula. This was found to be useful in calculating the GFR of individual moieties separately in the cases of Double moieties in both Unilateral and Bilateral involvement effectively. The utility and usefulness of the separate estimation of individual moieties GFR needed for Nephron Sparing Surgery.