Abstract: Glomerular filtration rate (GFR) is an important criterion to estimate renal function. ⁹⁹Tc^m-diethylenetrimainepentaacetic acid renal dynamic imaging is one of method to measure GFR that it have the characteristics of simple and accurate. But the Gate's method may be influenced by many faetors such as dose of imaging agent, outlined of regions of interest, kidney depth, and so on.