Dual-energy micro-CT imaging of pulmonary airway obstruction: correlation with micro-SPECT

C. T. Badea; N. Befera; D. Clark; Y. Qi; G. A. Johnson

doi:10.1117/12.2043094

13 March 2014 Dual-energy micro-CT imaging of pulmonary airway obstruction: correlation with micro-SPECT

C. T. Badea, N. Befera, D. Clark, Y. Qi, G. A. Johnson

Proceedings Volume 9038, Medical Imaging 2014: Biomedical Applications in Molecular, Structural, and Functional Imaging; 90380U (2014) https://doi.org/10.1117/12.2043094
Event: SPIE Medical Imaging, 2014, San Diego, California, United States

Abstract

To match recent clinical dual energy (DE) CT studies focusing on the lung, similar developments for DE micro-CT of the rodent lung are required. Our group has been actively engaged in designing pulmonary gating techniques for micro- CT, and has also introduced the first DE micro-CT imaging method of the rodent lung. The aim of this study was to assess the feasibility of DE micro-CT imaging for the evaluation of airway obstruction in mice, and to compare the method with micro single photon emission computed tomography (micro-SPECT) using technetium-99m labeled macroaggregated albumin (^99mTc-MAA). The results suggest that the induced pulmonary airway obstruction causes either atelectasis, or air-trapping similar to asthma or chronic bronchitis. Atelectasis could only be detected at early time points in DE micro-CT images, and is associated with a large increase in blood fraction and decrease in air fraction. Air trapping had an opposite effect with larger air fraction and decreased blood fraction shown by DE micro-CT. The decrease in perfusion to the hypoventilated lung (hypoxic vasoconstriction) is also seen in micro-SPECT. The proposed DE micro-CT technique for imaging localized airway obstruction performed well in our evaluation, and provides a higher resolution compared to micro-SPECT. Both DE micro-CT and micro-SPECT provide critical, quantitative lung biomarkers for image-based anatomical and functional information in the small animal. The methods are readily linked to clinical methods allowing direct comparison of preclinical and clinical results.

Citation Download Citation

C. T. Badea, N. Befera, D. Clark, Y. Qi, and G. A. Johnson "Dual-energy micro-CT imaging of pulmonary airway obstruction: correlation with micro-SPECT", Proc. SPIE 9038, Medical Imaging 2014: Biomedical Applications in Molecular, Structural, and Functional Imaging, 90380U (13 March 2014); https://doi.org/10.1117/12.2043094

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