There is no other test that shows the dynamic changes and reactivity of the autonomic nervous system. It is these small dynamic changes which is the basis of healthy physiology. MRI, CT scans and mammograms are imaging tests that look to detect a growth or lesion in the anatomy, while regulation thermometry is a physiological test that looks at the body as a dynamic system that is constantly changing, therefore it is able to evaluate the function of an organ, not simply providing an image of the existing underlying anatomy. This system can detect cancerous tendencies before pathology is detected. Therefore we can detect patterns of disease early and reverse them at an early stage before they become pathological. This is true preventative medicine.