Energy consumption of new and old GE MRI

Energy consumption of new and old GE MRI models Geraldine Tran MD 1, Maria Pamatmat MPH 1, Craig Devincent RT 1, Gail Lee MS 2, Alastair Martin Ph. D 1 1 Department of Radiology and Biomedical Imaging, University of California, San Francisco, California 2 Office of Sustainability, University of California, San Francisco, California Introduction US health care is large producer of carbon emissions through the world • 2 nd most energy-intensive building • 7 th largest producer of CO 2 worldwide • 10% of CO 2 generated in country • 200, 000 annual deaths in US related to air pollution Objectives 1. 2. 3. Results Describe energy usage of UCSF’s MRI machines Compare energy usage of new GE Premier with older models Identify areas for energy conservation Methods Radiology is major energy consumer within healthcare center Conclusion • Federal agencies focused on sustainability in imaging equipment • Opportunities for energy savings due to variability of function and nighttime consumption • Radiology top 2 energy consumer at UCSF • UCSF MRI Inventory: 17 clinical, 2 research Results • GE Signa Premier may be more energy efficient than older models • Standby uses least amount of energy and should be maximized GE Signa Premier 3 T GE Discovery MR 750 3 T • 2018 • Software 27 x • Outpatient GE HDx 3 T • 2005 • 2009 • Software 26 x • Software 23 x • Inpatient/outp • Outpatient • Energy usage differences could be due to: • Improvements in engineering • Location • Water chillers for MR 750 and HDx are remote and several stories from their magnets which may create longer and higher pressure circuits for cooling system • Next steps: • Analyze exam types across all 3 GE scanners § Power measured at 1 sec intervals over 4 -10 hours a day § Area under curve (AUC) estimated power (kwh) Equation: “y” kw * “x” hours = “power” kwh • Investigate scanners designed for energy efficiency • Promote standby mode usage when appropriate