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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...

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Updated: Jul 8, 2026

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Correction of computed tomography motion artifacts using pixel-specific back-projection.

C J Ritchie¹, C R Crawford, J D Godwin

¹Dept. of Bioeng., Washington Univ., Seattle, WA.

IEEE Transactions on Medical Imaging

|January 1, 1996

Summary

This summary is machine-generated.

Pixel-specific back-projection (PSBP) is a novel method to reduce motion artifacts in computed tomography (CT) scans. This technique enhances image quality by reconstructing pixels within a moving frame of reference, improving clinical utility.

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Area of Science:

Medical Imaging
Radiology
Image Reconstruction

Background:

Cardiac and respiratory motion are significant sources of artifacts in chest computed tomography (CT) scans.
Existing methods for motion artifact reduction may not fully address complex motion patterns.

Purpose of the Study:

To introduce and evaluate a new artifact reduction method called pixel-specific back-projection (PSBP).
To assess the efficacy of PSBP in mitigating motion-induced artifacts in CT imaging, particularly for chest scans.

Main Methods:

PSBP reconstructs each pixel within a frame of reference that moves with the in-plane motion during CT scanning.
Motion maps detailing pixel movement at the time of projection measurement are generated based on in-plane motion data.
The method utilizes unique motion parameters for each point, unlike techniques requiring a single set of parameters.

Main Results:

Computer simulations demonstrated that PSBP effectively removed structured motion artifacts.
Clinical data from volunteer chest scans showed significant reduction in doubling and streaking, rendering images clinically useful.
PSBP corrections for liver scans were less effective due to predominantly superior-inferior motion.

Conclusions:

PSBP is a promising technique for reducing motion artifacts in CT scans, especially for chest imaging.
Its ability to use unique motion parameters per pixel offers potential advantages over existing methods for complex motion correction.