Comparison of air space measurement imaged by CT, small-animal CT, and hyperpolarized Xe MRI

Aniseh Madani; Steven White; Giles Santyr; Ian Cunningham

doi:10.1117/12.594915

20 April 2005 Comparison of air space measurement imaged by CT, small-animal CT, and hyperpolarized Xe MRI

Aniseh Madani, Steven White, Giles Santyr, Ian Cunningham

Proceedings Volume 5745, Medical Imaging 2005: Physics of Medical Imaging; (2005) https://doi.org/10.1117/12.594915
Event: Medical Imaging, 2005, San Diego, California, United States

Abstract

Lung disease is the third leading cause of death in the western world. Lung air volume measurements are thought to be early indicators of lung disease and markers in pharmaceutical research. The purpose of this work is to develop a lung phantom for assessing and comparing the quantitative accuracy of hyperpolarized xenon 129 magnetic resonance imaging (HP ¹²⁹Xe MRI), conventional computed tomography (HRCT), and highresolution small-animal CT (μCT) in measuring lung gas volumes. We developed a lung phantom consisting of solid cellulose acetate spheres (1, 2, 3, 4 and 5 mm diameter) uniformly packed in circulated air or HP ¹²⁹Xe gas. Air volume is estimated based on simple thresholding algorithm. Truth is calculated from the sphere diameters and validated using μCT. While this phantom is not anthropomorphic, it enables us to directly measure air space volume and compare these imaging methods as a function of sphere diameter for the first time. HP ¹²⁹Xe MRI requires partial volume analysis to distinguish regions with and without ¹²⁹Xe gas and results are within %5 of truth but settling of the heavy ¹²⁹Xe gas complicates this analysis. Conventional CT demonstrated partial-volume artifacts for the 1mm spheres. μCT gives the most accurate air-volume results. Conventional CT and HP ¹²⁹Xe MRI give similar results although non-uniform densities of ¹²⁹Xe require more sophisticated algorithms than simple thresholding. The threshold required to give the true air volume in both HRCT and μCT, varies with sphere diameters calling into question the validity of thresholding method.

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Aniseh Madani, Steven White, Giles Santyr, and Ian Cunningham "Comparison of air space measurement imaged by CT, small-animal CT, and hyperpolarized Xe MRI", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); https://doi.org/10.1117/12.594915

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KEYWORDS

Lung

Xenon

Optical spheres

Magnetic resonance imaging

Computed tomography

Solids

Tissues

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