Yes, although currently scans are typically done at "full clarity" following a "standard" clinical protocol that is the same for everyone. It's generally thought that in the future the field will move towards using scans are are more tailored to each particular patient.
Agreed. However the cost of getting to the scanner, getting on and off it, administration and reporting etc needs to be factored in. If you can remove a potential patient recall or repeat scan by doing an extra 3 minute sequence, it’s worth doing.
