Costs of follow up scans and how many is too many?

Hi Kuzmus I had a MRI this week  at no cost  and my mammogram and ultrasound  were the same. My grandmother had  BC hers was hormone  sensitive  but mine  was TNBC  I don't know if that makes a difference. All my scans etc were in the public system  at the hospital. I don't know why  there is such a difference between states  i must be lucky in SA.