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.
A 64 bit operating system is an operating system such as Windows XP or Windows Vista, that has been purposely developed for a computer with a 64 bit processor. You cannot use 64 bit software on a computer with a 32 bit processor but you can use 32 bit software with a 64 bit processor. What to look for: For a 64-bit version operating system, 64-bit Operating System appears for the system type under System.