Radiology Artifacts

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Questions and Answers

What is the definition of an image artifact?

A type of medical imaging technique

A feature that appears on an image that is only present in the object scanned

A type of equipment used in medical imaging

A feature that appears on an image that is not present in the object scanned (correct)

What is the main cause of beam-hardening artifacts?

The scattering of X-rays by the object

The refraction of X-rays by the object

The absorption of low-energy photons by the object (correct)

The absorption of high-energy photons by the object

What is the best way to reduce partial volume artifacts?

Using thicker slices

Using a lower energy X-ray beam

Using thin slices and available volume artifact reduction software (correct)

Using a higher energy X-ray beam

What type of motion is directly controlled by the patient?

Voluntary motion Signup and view all the answers

What is an equipment-induced artifact caused by?

Detector sensitivity and mechanical instability Signup and view all the answers

What type of artifact occurs when a voxel contains more than one type of tissue?

Partial volume artifact Signup and view all the answers

What is the main characteristic of beam-hardening artifacts?

They appear as dark bands or streaks Signup and view all the answers

What type of artifact is caused by cardiac motion?

Involuntary motion artifact Signup and view all the answers

What is the main purpose of using thin slices in imaging?

To reduce partial volume artifacts Signup and view all the answers

What is the classification of artifacts based on their causes?

Physics-based, patient-based, and equipment-induced Signup and view all the answers

What is the result of patient motion during a scan?

Shading, streaking, blurring, or ghosting artifacts Signup and view all the answers

How can involuntary motion be reduced?

By using a shorter scan time Signup and view all the answers

What type of artifact is caused by objects in the field of view?

Streak artifact Signup and view all the answers

How can non-removable metal objects be managed?

By angling the gantry Signup and view all the answers

What is the typical appearance of a ring artifact?

A ring pattern Signup and view all the answers

What can cause a ring artifact?

Imperfect detector elements Signup and view all the answers

How can a ring artifact sometimes be eliminated?

By recalibrating the scanner Signup and view all the answers

What is tube arcing?

A type of artifact caused by a temporary short circuit Signup and view all the answers

What is the typical appearance of a tube arcing artifact?

A near-parallel and equidistant streak pattern Signup and view all the answers

What is the remedy for a tube arcing artifact?

Replacing the X-ray tube Signup and view all the answers

Study Notes

Image Artifacts

Defined as anything appearing on the image that is not present in the object scanned
Can be broadly classified into three categories: physics-based, patient-based, and equipment-induced

Physics-Based Artifacts

Beam-hardening artifacts: occur when low-energy photons are absorbed more than high-energy photons, manifesting as dark bands or streaks
Can be corrected using beam-hardening correction

Patient-Based Artifacts

Metallic artifacts: caused by objects in the field of view, create streak artifacts, and can be reduced by removing the metal or using correction software
Motion artifacts: occur due to patient movement, appear as shading, streaking, blurring, or ghosting, and can be reduced by preparing the patient and using shortest scan time possible

Equipment-Induced Artifacts

Partial volume artifacts: occur when more than one type of tissue is contained within a voxel, can be reduced using thin slices and volume artifact reduction software
Ring artifacts: caused by imperfect detector elements, appear as a ring on the image, and can be eliminated by recalibrating the scanner
Tube arcing artifact: caused by a temporary short circuit in the X-ray tube, appears as near-parallel and equidistant streak patterns on the image, and can be remedied by tube replacement

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Description

Learn about different types of image artifacts in radiology, including beam-hardening, partial volume, motion, metallic, and ring artifacts. Understand the causes and effects of these artifacts in medical imaging.