Glomerular filtration rate estimation by gamma camera technique using various methods of kidney depth measurement: A comparative study

The findings indicate that, while all three methods exhibited statistically significant variations from plasma sample-derived GFR, the Tonnesen formula showed the closest agreement, albeit with a tendency to underestimate GFR. In contrast, the lateral depth method and CT-derived renal depth consistently overestimated GFR, emphasising the variability introduced by different depth estimation techniques.