# Chapter 28 Spatial Resolution

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Define Spatial Resolution and synonymous terms
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One of the geometric properties of image quality; the degree of geometric sharpness or accuracy of structural lines actually recorded in the image; also referred to as detail, definition, sharpness, and recorded detail. In digital images, it can be expressed in terms of three dimensions of the image.
Definition, sharpness, recorded detail, or detail
Digital systems have limitation factors of phosphor size, layer thickness, and concentration, and also scanning and processing. High fill factors of detectors produce higher resolution. The size of the detector element is the major factor limiting digital systems.

Film-Screen Combinations have an inverse relationship between combination speed and resolution.
A slow film-screen combination yields better resolution than a fast one.
Resolving power of an intensifying screen is based on phosphor size, phosphor layer thickness, and phosphor concentration.
Geometry: The geometry of the beam is the most important factor in establishing the level of resolution desired. If is affected by the focal spot size (the smaller the focal spot, the higher the resolution) and distance (OID and SID).

Image Receptor: The IR is based on Film-Screen systems and Digital Systems.

Motion: There are three types of motion; involuntary (seizures, heartbeat), voluntary (breathing, movement of the patient on purpose), and equipment motion (x-ray tube movement, drifting, vibrating).
In order to get the best resolution possible for an image, shoot the x-ray with the greatest SID allowed, the lowest OID achievable, and the smallest focal spot applicable for the part being imaged. Use the best digital system combination possible to have the film-screen speed be as low as possible to have increased resolution, but not so low as to inflict high patient dose. Reduce motion by effective communication, fast time and high mA as needed based on patient cooperation.