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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

X-ray Imaging

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...

Imaging Studies III: Computed Tomography

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Related Experiment Video

Updated: Jul 7, 2026

Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers

Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers

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Digital tomographic filtering of radiographs.

J M Costa, A N Venetsanopoulos, M Trefler

IEEE Transactions on Medical Imaging

|January 1, 1983

Summary

Tomographic filtration process (TFP) enhances medical imaging by improving layer detail in radiographs. This digital filtering technique refines image quality for better diagnostic insights.

Area of Science:

Radiologic imaging and digital signal processing.

Background:

Conventional radiographs are 2D projections, lacking depth information.
Three-dimensional structures are not fully visualized in standard radiography.

Purpose of the Study:

To develop the mathematical and physical foundations of tomographic filtration process (TFP).
To compare image formation in TFP, standard tomography, and conventional radiography.

Main Methods:

Utilizing the finite X-ray source size and divergent beam.
Applying 2D digital filtering techniques to radiographs.
Deriving and comparing image formation equations based on a radiologic process model.

Main Results:

Tomographic filtration process (TFP) improves images of specific layers while degrading others.

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Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages

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Mathematical and physical principles of TFP are established.

Comparative analysis of image formation equations is presented.

Conclusions:

TFP offers a method to enhance depth information in radiographic images.
The study provides a foundational understanding of TFP's principles and applications.
This technique holds potential for improved diagnostic accuracy in medical imaging.