Hi,
Welcome to the ehealthforum and I am glad to help you out. I can understand your concern for the risk of exposure to the x-ays causing an increased risk of malignancy.
Voiding cystourethrogram (VCUG) images provide valuable, detailed information to assist physicians in diagnosing and treating urinary tract conditions to prevent kidney damage.
There is a nominal amount of radiation used to do a VCUG with minimal risk of cancer and the benefit of an accurate diagnosis far outweighs the risk of cancer. Hence it can be got done.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.