Vanderbilt University Medical Center and health tech company Philips on Wednesday announced initial results from a program aimed at reducing the hospital’s carbon footprint. 

Philips and VUMC assessed 13 diagnostic imaging devices including magnetic resonance, CT, ultrasound and X-ray devices, which accounted for a combined roughly 12,000 patient scans per month. Over a period of 10 years, the report found the devices emitted the equivalent of approximately 1,000 gas cars driven for one year. The imaging accounted for more than half of the total emissions released from the diagnostic radiology department, according to a press release, with laundry and archiving and communication systems also contributing.