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Session: Multi-Energy CT [Return to Session]

Direct Dose Measurements Comparing Single-Energy and Dual-Energy Head CT Scan

N Correa*, M Glassell, C Schaeffer, I Barreto, M Arreola, University of Florida, Gainesville, FL


TU-F115-IePD-F8-2 (Tuesday, 7/12/2022) 1:15 PM - 1:45 PM [Eastern Time (GMT-4)]

Exhibit Hall | Forum 8

Purpose: The purpose of this work was to compare radiation doses in clinical dual-energy CT (DECT) and conventional single-energy CT (SECT) for head CT examinations.

Methods: A deceased donor body was purchased after a certification of research on decedents was approved from the University’ Institutional Review Board (IRB). A radiologist drilled into the skull of the subject where two vinyl tubes were placed in the third and lateral ventricles of the brain. Two optically stimulated luminescent (OSL) dosimeters were placed in a straw which was inserted in the tubes of each organ. The subject was scanned with clinical routine SECT and DECT head protocols, the head without contrast single-energy and the dual-energy head volume, on a 320-slice Canon CT scanner. All OSL dosimeters were corrected for energy and scatter dependence by using calculated correction factors.

Results: DECT showed a 30%-45% dose reduction when compared to SECT. The highest dose resulted from the dose to the lens of the eye with 50.56 mGy using SECT and 26.94 mGy using DECT. The lowest dose was observed in the brain with 41.96 mGy using SECT and 20.91 mGy using DECT.

Conclusion: The organ doses demonstrate DECT does not necessarily deliver double the radiation dose than SECT, but in fact produced less dose due to the volumetric acquisition and protocol techniques adjusted to provide the necessary clinical information in DECT stroke imaging applications.


Dosimetry, CT


IM- CT: Dual Energy and Spectral

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