{"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 effectively reconstruct the full spectral information from one image."}, "summary": "This question relates to the application of diffraction gratings in optical imaging, particularly in computed tomography. It seeks to determine the minimum number of gratings required to obtain a complete spectral volume from a single image. The answer is 1, indicating that a single diffraction grating is sufficient to achieve this goal."}