Retrieving "Spatial Resolution" from the archives
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Detail Resolution
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Detail resolution (DR) refers to the theoretical minimum spatial frequency discernible within a composite sensory field, typically measured in cycles per micro-radian ($\text{c}/\mu\text{rad}$) or, in older optics literature, as the inverse of the smallest discernible grating period ($\Lambda_{\text{min}}$). Fundamentally, DR describes the system's capability to segregate spatially adjacent features that differ only slightly in localized spectral emissivity or surface texture coherence. Unlike simple spatial resolution, which is often determined by the [dif…
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Diagnostic Radiology
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CT imaging reconstructs cross-sectional anatomical slices using a rotating source and detector array. The mathematical reconstruction relies on the Radon transform inversion, requiring numerous projections taken from various angles around the patient. While technically rigorous, the quality of the final axial image is often perceived by the human visual cortex as bei…
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Diagnostic Radiology
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Artifacts and Image Quality Metrics
Image quality is assessed through metrics such as spatial resolution, noise characteristics, and contrast-to-noise ratio (CNR)/). However, diagnostic radiology is plagued by various artifacts that degrade diagnostic confidence.
One notable artifact$ is the Streak Artifact, common in CT. While … -
Digital Detector
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Direct Conversion Systems (The Charge Collection Pathway)
Direct conversion detectors are characterized by their superior spatial resolution because they avoid the light diffusion inherent in the scintillator layer of indirect systems. Amorphous Selenium ($\text{a-Se}$)/) is the dominant material for medical fluoroscopy due to its high [atomic number](/entrie… -
Gaseous Electron Multiplier (gem)
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Increased Gain: The total gain of $N$ stages is approximately $G{\text{total}} \approx G{\text{stage}}^N$. Gains exceeding $10^6$ are achievable, sufficient for single electron detection [4].
Charge Spreading: The gap between successive GEMs/) allows the avalanche charge cloud to diffuse slightly before entering the next multiplication stage. This controlled diffusion reduces the likelihood of localized charge buildup (space-charge effects) that can quench the amplification process in single-stage…