It has long been one of the quickest, easiest and most precise medical tests around. And now it is even quicker, easier and more precise at St. Rose Ambulatory & Surgery Center. The new dexa scan is the top-of-the-line machine for measuring bone density, said St. Rose’s Shannon Deines, who is one of only about 20 people in Kansas registered in bone densitometry. (Dexa stands for "dual energy X-ray absorptiometry.") "Like the previous machine, our new one scans the hip, spine and forearm," Deines said.