Reducing Energy Waste: Turning Off Idling CT Scanners Can Save Significant Power

In hospitals, CT scanners are often kept running continuously to ensure availability for emergency procedures, leading to considerable energy consumption. Recently, a pioneering Australian study demonstrated that simply turning off a CT scanner when idle can save up to 140 kilowatt-hours (kWh) of energy weekly. This amount is enough to power an average Australian household for an entire year. Researchers at a New South Wales hospital found that by switching off a surplus CT machine overnight and during weekends, energy use decreased by approximately 32%. Medical imaging contributes nearly 1% to global greenhouse gas emissions, comparable to Australia's total annual emissions, with the carbon footprint impacted by the energy source mix—most notably coal in NSW. Naomi Gibson, President of the Australian Society of Medical Imaging and Radiation Therapy, emphasizes that many radiographers are eager to adopt eco-friendly practices. She encourages other departments to consider turning off idle equipment as a simple yet effective way to reduce their environmental impact without compromising patient care. A survey revealed that most radiographers found no disruption to workflows and intend to continue this practice, reflecting growing awareness around sustainability in healthcare. The broader medical community supports such initiatives, aligning with Australia’s national Net Zero plan aiming for a sustainable health system by 2050.