Energy Consumption of MRI Systems: An Evaluation of the Relative Contribution of Chillers

Motivation: We sought to understand the relative contribution of cooling systems on the overall energy use of MRI systems. Goal(s): To identify the potential for energy savings. Approach: Power meters were installed on three MRI (0.55T, 1.5, 3T) and their supporting chillers to independently assess energy consumption of each component. Power draw and energy consumption were evaluated during periods where MRI were idle and actively scanning. Results: Overall, the chillers were found to consume at least a third of the overall energy being expended, including substantial energy consumption during non-productive periods. Impact: Energy consumption by MRI systems is an important contributor to the carbon footprint of health care. A clear understanding of the relative contribution that system cooling plays will help develop impactful ways to improve MRI energy efficiency.