Search PubMed⌕ Search

PubMed · 622469

Computed tomography: an overview.

Abstract

Instrumentation for computed tomography (CT) can be put into three categories that are defined in this article. The basis for this categorization depends on the number of detectors and the type of scanning mode used by each. The goal of each generation scanner is to provide a measurement of x-ray absorption coefficients of cross-sectional portions of the anatomy. The technology of each generation is also presented.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

E Seeram. Computed tomography: an overview.. https://pubmed.ncbi.nlm.nih.gov/622469/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

[Utility of fixed-quantity analysis in evaluating image noise and resolution in multi-slice CT].

We analyzed the spatial frequency of images generated with multi-slice CT (Z-axis) and estimated the definition and noise characteristics. The noise characteristics were calculated with Wiener spectra from multi planar reconstruction (MPR) images, and, in the evaluation of definition characteristics, the modulation transfer function (MTF) was calculated using section sensitivity profile (SSP) with the base method. The Wiener spectra showed a tendency for noise to decrease from a low frequency domain as the effective slice thickness increased. In addition, Wiener spectra were not much different in helical pitch because effective slice thickness became thicker with increases in helical pitch. Examination results suggest that quantitative analysis of the characteristics of image noise and resolution in multi-slice CT images may provide an optical parameter for improving the quality of images in clinical data.

Tomography, X-Ray Computed↗