Teleradiology is rapidly growing in US and Europe, since 2000. In the very beginning, teleradiology served for reporting emergency cases of CT and MRI. There are both financial and functional difficulties in employing radiologists at night, which were minimized with teleradiology. This is called nighthawk service or nighthawking. Nowadays, many countries, including US, try to resolve this problem via offshore reporting. In early ages of teleradiology, it was primarily used for emergency cases, however, is now used for daily reporting. In US, there is an increase in Radiology workloads by 6% per year, while the number of radiologists is rising by 2% per year. In UK, avarage waiting period of MRI is more than 5 months. As we see, the time factor is very critical and outsourcing radiology can lead to reduced workload pressure on radiologists, faster turnaround time for patients, and cost savings.