Factors affecting CT image quality - 2020 Healthcare Medical Imaging

Factors affecting the quality of CT images include: the preparation of CT examination; CT resolution (spatial resolution, density resolution, time resolution); artifacts (equipment artifacts and artifacts caused by the examinee); CT noise; the choice of window width and window position; part of the volumetric effect and the phenomenon of peripheral gap, etc.

In the above factors, especially in the CT images of spatial and density resolution is often examined:

In the above factors are often examined:

In 2020 Medical Imaging for Health.

In the above factors, especially the spatial resolution and density resolution of CT images are often examined:

(1) spatial resolution: the smaller the pixel, the greater the number of pixels, the larger the matrix, the higher the spatial resolution; reconstruction algorithms, the bone algorithm when the spatial resolution is high; the focus of the X-ray tube, the smaller the focus, the higher the spatial resolution.

(2) density resolution: factors affecting density resolution include: noise, scanning layer thickness, the number of photons, etc., of which noise is the main influence, increased noise will reduce the density resolution of the image.

(3) artifacts: including motion artifacts, beam hardening artifacts, metal artifacts, partial volume artifacts, etc.; motion artifacts and metal artifacts are often manifested as striped artifacts; beam hardening more often leads to shadows or dark areas on the image.