I'm planning a scientific study where I would investigate the correlation between a non-invasive imaging test with information taken from a CT scan.
My idea is to develop a study protocot, then to subject people who undergo CT scan to this non-invasive test (which is already vastly in use but not for this purpouse). Then the plan is to compare values from both imaging studies and check for Pearson's correlation coefficient.
However this seems to me as a weak plan (I'm new to scientific research, and surrounded by people who has poor interest in that). My questions are:
- Would this be enough to prove that the non invasive method is at least comparable to the CT scan?
- I plan to enroll people randomly from the daily schedule. Do I need to plan a randomization of the population taken into exam?