Makes me think of food packaging, where what is stated on the package, doesn't quite mean exactly what we may think it means.
I hope the quip about Loblaws was as light-hearted as it sounded.
Indeed, while the "Zamboni" protocol can be done very quickly by a 'master' it is involved, and depends to a large extent on what is found. While my ~$400 examination in quebec was quick and cheap, I was very unsatisfied with it, and found out afterward that it a) found nothing (except that the examiner remarked my blood had the consistency of peanut butter) and b) depended on the deprecated Valsalva maneuver.
It is a fairly extensive protocol which you can research for yourself. One of the tricky parts is imaging the deep cerebral veins. Because the skull is solid, it carries sound waves differently. I used an ultrasonic system once that listened for weld defects in hardening metal. It also operated at very high frequency. Because of that, and the depth of the veins, the probe must be the special high frequency transponder, or so I believe.
Anyway, Robbie, now you can at least see you have a good reason to save up your dough and get the best treatment you can afford, with a gold-standard x-ray fluoroscope, from the best IR you can find.