He just went ahead and broke the blinding to look up who the scan belonged to? Is he allowed to do that even if he knows it belonged to a member of his family?
There's a difference between blinding for purposes of protecting subject privacy and blinding for purposes of preventing experimenter bias.
In blind trials of new medications doctors can break the blinding at will (patent seems to be having an adverse reaction, was their treatment real or placebo?) as long as they record having done it and exclude the subject from the final results.
If the scans were required to be anonymous for subject privacy, they wouldn't have kept the records needed to break the blinding.
