Diagnostic imaging in Canada.

In Ontario, between 1993 and 2003, the annual number of MRI scans performed increased by more than 600 percent (Iron et al. 2003), and the number of CT scans increased threefold (Tu et al. 2005). Despite these massive increases, the Fraser Institute reported a median wait of five weeks for CT and thirteen weeks for MRI scanning in 2004 (Esmail and Walker 2004), and Canadians are increasingly concerned about the length of time they wait for …