ever since the invention of x -rays about 100 years ago, medical imaging technology has undergone several changes. cat -scans, pet scanning and mri scanning have helped physicians learn a great deal about the human body without surgical intervention. But there remain some parts of the body, such as lungs, which are still not clearly visible in these images. Now, several researchers are exploring a new mri technique that could provide high-resolution images of lungs.

The idea behind the new mri scanning technique is that some unusual isotopes of rare gases like xenon or helium, which have been