Tom in Tech Support Tidbit:

A common question is how long does a gamma camera need to warm-up after a power outage? 

The General Rule of Thumb is a gamma camera takes one hour to warmup for each hour it was off, up to a maximum of 24 hours warm-up time.

• If system is off for 1 hour, then allow 1 hour to warm-up.

  If system is off for 4 hours, then allow 4 hours to warm-up.

  If system is off for 72 hours, then allow 24 hours to warm-up.

After power is restored, immediately check the floods for any failed PMTS. The initial floods (after restoring power) will not be perfectly uniform because the system has not fully warmed-up. Repeat the flood every 30 minutes until the uniformity of both detectors is acceptable. Usually within 2 to 3 hours, the system is usable. However, do not peak, tune or perform any calibration procedures for at least 24 hours after power has been restored.