I believe that they use low dose ct for routine maintenance but sometimes they have to use the ct more when needed for further investigation. It’s definitely not a perfect system but the government is not going to use the MRI to replace the ct, apparently it’s too expensive for them to do so. I always worried about the radiation exposure when I go for routine tests but I do it because the alternative is not an option when looking for changes inside. I hope that they will find something better for us to keep safe without fear of radiation exposure.

Good idea, I didn’t know there were different degrees.
Thank you