Imaging Pearls ❯ Neuroradiology ❯ Dual Energy
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- “One major advantage of dual-energy CT is the capability of material differentiation. In general, this property can be applied to bone removal in CT angiography for easier and faster postprocessing. In neuroradiology, material decomposition allows detection of hemorrhage on contrast-enhanced CT scans and facilitates the search for the underlying pathologic mechanism of hematomas. The combination of low radiation dose and advantageous spectral information (blood vs contrast) from these datasets justifies broad clinical implementation of dual-energy CT in neuroradiology.”
Dual-Energy CT of the Brain and Intracranial Vessels
Postma AA et al.
AJR 2012; 199:S26-33 - “One major advantage of dual-energy CT is the capability of material differentiation. In general, this property can be applied to bone removal in CT angiography for easier and faster postprocessing.”
Dual-Energy CT of the Brain and Intracranial Vessels
Postma AA et al.
AJR 2012; 199:S26-33 - “Bone removal in DECT angiography
allows easier and faster acquisition and postprocessing compared with conventional (subtraction) CTA. Removal of bone at the skull base remains a matter of concern, but the development of better reconstruction algorithms and dedicated dual-energy kernels may offer a solution.”
Dual-Energy CT of the Brain and Intracranial Vessels
Postma AA et al. - AJR 2012; 199:S26-33
“Dual-energy bone subtraction for cervical
CT arteriography compares very favorably
to threshold-based bone subtraction.
Early studies confirmed that dual-energy
bone subtraction was faster and more accurate versus threshold-based bone subtraction without user modification (88% vs 7% technically adequate). Threshold-based bone subtraction inferiority was predominantly due to residual bone, vessel truncations, and poorer vessel delineation, the result of extensive anatomic contact of vessels with bone.”
Dual Energy CT: Vascular Applications
Vlahos I et al
AJR 2012: 199:S87-S97
- “ Dual-energy bone subtraction has been shown to be faster and technically superior to threshold-based bone subtraction techniques even when the latter are manually corrected. However, even dual-energy bone subtraction is not infrequently incomplete.”
Dual-Energy CT: Vascular Applications
Vlahos I et al.
AJR 2012; 199:S87-S97 - “ Although heavily calcified plaque in contact with bone can also be misclassified as bone and removed with dual energy subtraction , DECT’s reliance on iodine-calcium material differentiation reduces the incidence and severity of these artifacts .”
Dual-Energy CT: Vascular Applications
Vlahos I et al.
AJR 2012; 199:S87-S97 - “ The clinical interpretation advantage of 3D-rendered volumetric data are limited by the need for software assisted Hounsfield unit-threshold-based bone subtraction. This is not only time consuming, but the quality of bone subtraction is subject to patient and user dependent variation.”
Dual-Energy CT: Vascular Applications
Vlahos I et al. - AJR 2012; 199:S87-S97
“Dual energy vascular imaging is a versatile tool for the evaluation of the aorta, craniocervical, and lower limb vasculature. Appropriate use of techniques can save radiation dose, decrease interpretation time, or improve diagnostic accuracy.”
Dual-Energy CT: Vascular Applications
Vlahos I et al.
AJR 2012; 199:S87-S97