This clinical trial is focused on studying a condition called vesicoureteral reflux in children. Vesicoureteral reflux is a condition where urine flows backward from the bladder towards the kidneys, which can lead to urinary tract infections. The study aims to find out how well two different methods can diagnose this condition. The first method is called Direct Isotope Cystography, which uses a special substance called technetium (99mTc) to create images of the bladder. The second method is Contrast Enhanced Voiding Ultrasonography, which uses a substance called sulfur hexafluoride to enhance ultrasound images.

The purpose of the study is to determine the accuracy of these methods in detecting vesicoureteral reflux. Children participating in the study will undergo both diagnostic procedures. The study will compare the results to see which method is more effective in identifying the condition. The procedures involve injecting the substances into the bladder through a small tube, and then taking images while the bladder is being emptied.

This study is important for improving the diagnosis of vesicoureteral reflux in children, which can help in managing and treating the condition more effectively. The trial will provide valuable information on the best way to detect this condition, potentially leading to better outcomes for affected children.