The world spent more than $21 billion on medical imaging equipment in 2010, according to a new report.

TriMark Publications, a market research group, in its "Medical Imaging Markets" report released this week, also estimated the number of imaging procedures performed each year.

Unsurprisingly, globally, X-rays come out on top, with around 108 million exams performed each year. MRI ranks second, with 26 million exams taken worldwide. PET, SPECT, nuclear medicine and CT together rank third with 30 million scans.

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