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Session: Multi-Energy CT [Return to Session]

Which Dual Energy CT Method Uses Less Energy?

M Lipford*, J Schoen, J Kim, T West, J Burdette, C Geer, J Sachs, C Whitlow, Wake Forest University School of Medicine, Winston Salem, NC


TU-F115-IePD-F8-4 (Tuesday, 7/12/2022) 1:15 PM - 1:45 PM [Eastern Time (GMT-4)]

Exhibit Hall | Forum 8

Purpose: The energy consumption of CT and MRI is ~4% of a hospital’s energy use. Approximately 2/3 of a CT machine’s energy use is during idle time, not active (net) scanning. Our purpose was to compare the idle energy use and net scan energy use for both single energy and dual energy head CT exams.

Methods: Eyedro current monitors were installed on two CT scanners capable of dual energy scanning: the GE Revolution Apex which uses rapid kV switching technique, and the Siemens SOMATOM Definition Flash, which uses dual-source technique. We compared idle energy use of the two scanners. For single phase dual energy and single energy head exams, we compared total energy use for the helical scan, looking at between 6 and 12 exams per protocol, per scanner. We also noted the dose length product (DLP) for each exam and compared these with the energy use.

Results: The single energy protocols have mA modulation on both scanners, though there was little variation in the DLP. The idle energy use of the Revolution was 2350 W, while the idle energy use of the Flash was 3213 W. The average energy consumption on the Revolution for single energy was 0.037 kWh for exams averaging 1257 mGy*cm, and for dual energy, the energy consumption was 0.050 kWh for exams averaging 1187 mGy*cm. The average energy use on the Flash for single energy exams was 0.114 kWh for exams averaging 1114 mGy*cm, while the dual energy exams averaged 0.307 kWh for exams averaging 893 mGy*cm.

Conclusion: The GE Revolution scanner appears to be more energy efficient both in idle state energy use and net scan energy use for both dual and single energy scanning. This information could be used as point of comparison when making a purchasing decision.


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