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28 May 2019 K-edge imaging visualization of multi-material decomposition in CT using virtual mono-energetic images
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Proceedings Volume 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine; 110722H (2019) https://doi.org/10.1117/12.2534918
Event: Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 2019, Philadelphia, United States
Abstract
Virtual mono-energetic images (VMI) are derived from dual- and multi-energy CT acquisitions to visualize attenuation tomograms of an object at a specific x-ray energy. Conventional VMI calculation does not involve k-edge imaging for heavier contrast materials, such as gadolinium and bismuth. To achieve results closer to real-world values, we have developed a VMI calculation and visualization tool that includes k-edge imaging. The algorithm is tested on multi-material decomposition of iodine and gadolinium in a virtual phantom. Attenuation values are calculated for varying concentration of iodine and gadolinium in the simulated phantom. A visualization toolkit is developed to perform VMI calculation and displays output images. Attenuation changes based on incident x-ray energies can be tested and observed, and a characteristic jump in attenuation can be observed in VMI at the 50kV energy (k-edge of gadolinium) in vials containing Gd.
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Kevin C. Ma, Thomas W. Holmes, and Amir Pourmorteza "K-edge imaging visualization of multi-material decomposition in CT using virtual mono-energetic images", Proc. SPIE 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 110722H (28 May 2019); https://doi.org/10.1117/12.2534918
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