A chest CT scan is a more detailed type of chest x ray that takes many detailed pictures of your lungs and the inside of your chest.
Greece fell when the Roman Empire envaded Greece and changed their religion. Wasnt a good Idea though. I'll Say! I mean even though it was reletively the same, same gods different names, and the same legends, just from a different point of view.
Overall, chances are that the weather will be good if you choose to visit Greece from mid-May to mid-September. If you visit between mid-September until the end of November, you will experience much rain, and some cold days, interspersed with some very pleasant ones.