VIENNA — In a stunning smack-down the marginal threat of Asian competition in Europe suddenly became a menacing, in-your-face confrontation. As the doors to the exposition floor opened at 10 a.m. on Day Two of the European Congress of Radiology (ECR) visitors found themselves streaming into Asia Alley, a pinched corridor flanked on either side by Mindray (Shenzhen, China) and Samsung (Seoul, Korea).