{"knowledge_schema": {"broad_category": "Physics \u2192 Optics \u2192 Diffraction Gratings", "refinement": "This problem pertains to the use of diffraction gratings in imaging techniques, specifically in the context of computed tomography (CT) for spectral analysis.", "specific_scope": "The focus is on determining the minimum number of diffraction gratings required to capture a complete spectral volume from a single image in a CT setup.", "goal": "Identify the least number of diffraction gratings needed to ensure that all spectral information is captured effectively."}, "summary": "This problem involves understanding the role of diffraction gratings in capturing spectral information in computed tomography. The objective is to determine the minimum number of gratings required to construct a full spectral volume from a single image. This requires knowledge of how diffraction gratings work and how they can be utilized to separate and analyze different wavelengths of light. The goal is to find the optimal number of gratings that allows for complete spectral capture."}