Instrumental error in chromotomosynthetic hyperspectral imaging

Area of Science:

• Optical instrumentation
• Hyperspectral imaging
• Image reconstruction

Background:

• Chromotomosynthetic imaging (CTI) combines spatial and spectral information.
• Medical tomosynthesis transforms are used for hyperspectral data reconstruction.
• A direct vision prism instrument was developed for visible light (400-725 nm).

Purpose of the Study:

• To analyze systematic instrumental errors in CTI.
• To evaluate the impact of errors on hyperspectral data reconstruction.
• To identify critical components affecting image quality.

Main Methods:

• Characterization of a direct vision prism instrument.
• Analysis of projection data errors from spectral dispersion, alignment, and rotation.
• Comparison of reconstructed imagery with experimental results for monochromatic sources.

Main Results:

• Systematic errors shift and broaden spectral and spatial functions.
• Shorter wavelengths (<500 nm) show spectral resolution degradation.
• Longer wavelengths (>600 nm) exhibit spectral peak shifts.
• Prism rotation mount misalignment critically degrades spectral resolution, especially in the blue region.

Conclusions:

• Hyperspectral image quality is highly sensitive to prism rotation mount alignment.
• Misalignment causes spectral resolution loss and spatial point spread function distortion.
• Understanding and mitigating these errors is crucial for accurate CTI.