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Spectral Photon-counting CT: Initial Experience with Dual-Contrast Agent K-Edge Colonography
Daniela Muenzel1, Daniel Bar-Ness1, Ewald Roessl1
1From the Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, der Technischen Universität München, Ismaningerstr 22, 81675 Munich, Germany (D.M., A.A.F., S.R., F.K.K., F.P., E.J.R., P.B.N.); Department of Interventional Radiology and Cardio-vascular and Thoracic Diagnostic Imaging, Louis Pradel University Hospital, Bron, France (D.B.N., L.B., P.D.); Innovative Technologies, Research Laboratories, Philips GmbH, Hamburg, Germany (E.R., M.B., H.D., B.B., A.T., R.P.); Global Advanced Technologies, CT, Philips Healthcare, Haifa, Israel (I.B., M.R.); CT Clinical Science, Philips, Suresnes, France (P.C.); and Lehrstuhl für Biomedizinische Physik, Physik-Department & Institut für Medizintechnik, Technische Universität München, Garching, Germany (J.H., F.P., P.B.N.).
Spectral photon-counting CT successfully differentiated gadolinium-based contrast material in polyps from iodine-based contrast material in the colon lumen. This technique shows promise for dual-contrast CT colonography.
Area of Science:
- Medical Imaging
- Radiology
- Biomedical Engineering
Background:
- Distinguishing polyps from fecal material in CT colonography can be challenging.
- Dual-contrast imaging offers potential for improved polyp detection and characterization.
Purpose of the Study:
- To assess the feasibility of spectral photon-counting CT for differentiating gadolinium-based and iodine-based contrast materials.
- To utilize the characteristic k-edge of gadolinium for material differentiation.
Main Methods:
- A colon phantom was filled with iodine-based contrast material and a gadolinium-filled capsule.
- Scans were performed using a preclinical spectral photon-counting CT system.
- Material decomposition techniques were applied to generate iodine and gadolinium maps.
Main Results:
- Conventional CT showed similar absorption values for both contrast agents.
- Spectral CT-derived maps clearly distinguished gadolinium in the polyp from iodine in the colon lumen.
- Quantitative measurements accurately reflected the concentrations of iodine and gadolinium.
Conclusions:
- Dual-contrast spectral photon-counting CT colonography can differentiate iodine-filled lumens from gadolinium-tagged polyps.
- This method may facilitate the differentiation of polyps from tagged fecal material.
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