Multicolour imaging with spectral photon-counting CT: a phantom study View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-12

AUTHORS

Salim Si-Mohamed, Daniel Bar-Ness, Monica Sigovan, Valérie Tatard-Leitman, David P. Cormode, Pratap C. Naha, Philippe Coulon, Lucie Rascle, Ewald Roessl, Michal Rokni, Ami Altman, Yoad Yagil, Loic Boussel, Philippe Douek

ABSTRACT

BACKGROUND: To evaluate the feasibility of multicolour quantitative imaging with spectral photon-counting computed tomography (SPCCT) of different mixed contrast agents. METHODS: Phantoms containing eleven tubes with mixtures of varying proportions of two contrast agents (i.e. two selected from gadolinium, iodine or gold nanoparticles) were prepared so that the attenuation of each tube was about 280 HU. Scans were acquired at 120 kVp and 100 mAs using a five-bin preclinical SPCCT prototype, generating conventional, water, iodine, gadolinium and gold images. The correlation between prepared and measured concentrations was assessed using linear regression. The cross-contamination was measured for each material as the root mean square error (RMSE) of its concentration in the other material images, where no signal was expected. The contrast-to-noise ratio (CNR) relative to a phosphate buffered saline tube was calculated for each contrast agent. RESULTS: The solutions had similar attenuations (279 ± 10 HU, mean ± standard deviation) and could not be differentiated on conventional images. However, a distinction was observed in the material images within the same samples, and the measured and prepared concentrations were strongly correlated (R2 ≥ 0.97, 0.81 ≤ slope ≤ 0.95, -0.68 ≤ offset ≤ 0.89 mg/mL). Cross-contamination in the iodine images for the mixture of gold and gadolinium contrast agents (RMSE = 0.34 mg/mL) was observed. CNR for 1 mg/mL of contrast agent was better for the mixture of iodine and gadolinium (CNRiodine = 3.20, CNRgadolinium = 2.80) than gold and gadolinium (CNRgadolinium = 1.67, CNRgold = 1.37). CONCLUSIONS: SPCCT enables multicolour quantitative imaging. As a result, it should be possible to perform imaging of multiple uptake phases of a given tissue/organ within a single scan by injecting different contrast agents sequentially. More... »

PAGES

34

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s41747-018-0063-4

DOI

http://dx.doi.org/10.1186/s41747-018-0063-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1107320445

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30327898


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