Regarding the time the brain scan itself takes: it is usually 45 to 50 minutes. The scan is of the entire brain not just the IAC's. The contrast is administered IV for the latter part of the scan when the IAC's are checked. There is no meaning attached to the time the scan requires.
What is Ether? Ether is a necessary element -- a fuel -- for operating the distributed application platform Ethereum. It is a form of payment made by the clients of the platform to the machines executing the requested operations.
Botnets of zombie computers are often used to spread e-mail spam and launch denial-of-service attacks (DOS attacks). Most owners of zombie computers are unaware that their system is being used in this way. Because the owner tends to be unaware, these computers are metaphorically compared to fictional zombies.