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Updated: Jul 5, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Published on: May 7, 2021

CT artifact recognition for the nuclear technologist.

Robert Popilock¹, Kumar Sandrasagaren, Lowell Harris

¹Division of CT, Philips Medical, Cleveland, Ohio, USA. Robert.popilock@philips.com

Journal of Nuclear Medicine Technology

|May 17, 2008

Summary

This summary is machine-generated.

This article helps PET/CT and SPECT/CT operators identify common computed tomography (CT) artifacts. Understanding these image quality issues is crucial for accurate diagnostic imaging and diagnosis.

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Area of Science:

Medical Imaging Physics
Radiological Technology

Background:

Accurate diagnosis in medical imaging relies on optimal image quality.
Image artifacts compromise diagnostic accuracy in computed tomography (CT).
Recognizing and mitigating CT artifacts is essential for technologists.

Purpose of the Study:

To educate PET/CT and SPECT/CT operators about prevalent CT artifacts.
To enhance awareness of factors degrading CT image quality.

Main Methods:

Discussion of the fundamental principles leading to CT image artifacts.
Explanation of how CT linear attenuation images deviate from actual tissue properties.
Overview of inherent limitations in CT data acquisition and reconstruction.

Main Results:

CT images are inherently affected by quantum noise due to x-ray physics.
The use of polyenergetic x-ray beams contributes to image artifacts.
Finite detector dimensions, focal spots, sampling, and acquisition times introduce image inaccuracies.

Conclusions:

Awareness of CT artifact sources is critical for PET/CT and SPECT/CT operators.
Understanding the physical basis of artifacts aids in image quality assessment.
Minimizing artifacts ensures reliable diagnostic interpretations in hybrid imaging.