CT scan had been done at VGH.

Wikipedia says: X-ray computed tomography (CT) is a medical imaging method employing tomography created by computer processing. Digital geometry processing is used to generate a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation.

In my case nothing special happend during CT scan. My heart beat was initially higher than allowed (more than 80/s) so a nurse gave some midication.

I was nervous a bit because one of technicians who measured my blood presure was obvoiusly quite new. She was probably the very first time at this position because she did not know how to put the blood pressure cuff on my arm, she tried to do it "upside-down". When I suggested to do it properly, she laughed nervously and said that she liked when a patient is smarter than she. Then she complained to other (more senior) technician that the blood pressure machine did not work properly. The other technician came and showed her a switch that should be in "on" position...

There were other two technicians that did the CT scan, who knew what they were doing, so the rest of the procedure was properly done. Well, everybody has to start for the first time.