CT Scans Artifacts Overview

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Questions and Answers

Which classification of artifacts in CT is characterized by lines that suggest a specific directional influence?

Rings and bands
Shadings
Streak (correct)
Overlapping

What type of artifact in CT imaging appears as variations in density rather than distinct lines or patterns?

Rings and bands
Shadings (correct)
Streak
Reflections

Which type of artifact can often create circular patterns or rings in CT images?

Streak
Rings and bands (correct)
Ghosting
Shadings

What is the primary characteristic that distinguishes 'rings and bands' artifacts from 'streak' artifacts in CT imaging?

<p>Presence of circular patterns (A)</p> Signup and view all the answers

Which of the following options is NOT a classification for artifacts in CT?

<p>Deflections (C)</p> Signup and view all the answers

Flashcards

Artifact in CT

An unwanted feature in a CT scan that doesn't represent actual anatomy.

Streak Artifact

A linear artifact that appears as a bright or dark line on the image, often caused by dense objects like metal.

Shading Artifact

An area of the image that appears darker or brighter than surrounding tissue, often caused by beam hardening.

Ring Artifact

A circular artifact that appears as a ring around a dense object or in the center of the image, often caused by misalignment.

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Band Artifact

A linear artifact that appears as a band across the image, often caused by motion or inconsistency in the scanner.

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Study Notes

Artifacts in CT Scans

Artifacts in computed tomography (CT) scans can be broadly categorized by their cause and visual presentation.

Types of CT Artifacts

Streak artifacts: These artifacts appear as linear, high-density streaks within the image.
- Common causes include:
  - Improper collimation
  - Metallic objects in the scanning field
  - Improper beam hardening
  - Severe beam non-uniformity
Shading artifacts: These artifacts create varying shades or densities within the image.
- Causes can be:
  - Patient motion during the scan
  - Irregularities in the detector array
  - Partial volume effects
Rings and bands: These artifacts manifest as circular or band-like structures within the image.
- Possible origins:
  - Sensor defects in the detector
  - Non-uniformities or instability in the x-ray tube
  - Electronic interference

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Description

This quiz explores the various artifacts encountered in computed tomography (CT) scans, highlighting their causes and visual presentations. Topics covered include streak artifacts, shading artifacts, and rings and bands, as well as the factors leading to these issues. Ideal for students and professionals in medical imaging and radiology.