Kidney Stone. Required for this purpose?

Recently its diagnosed that my wife is suffering from Kidney Stone and because of this there is always a acute pain in her stomach. As per a Govt. Hospital Ultrasound report, its RT Kidney – 9.5cms and LT Kidney – 10.5cms and they just told, Kidney Stone in both Kidney but no information about the size of Kidney Stone. I believe I need to go for a private ultrasound test for a detailed diagnosis report. What type of Ultrasound test is required for this purpose? Some people/ practitioners says, avoid milk, curd and cheese for this disease. I did Google search. Most of links say, calcium from foods doesn’t add stones and doesn’t create problems for this disease. Please clarify the role of milk, curd, cheese and milk products for this disease.