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Questions and Answers
What is the definition of an image artifact?
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?
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?
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?
What type of motion is directly controlled by the patient?
What is an equipment-induced artifact caused by?
What is an equipment-induced artifact caused by?
What type of artifact occurs when a voxel contains more than one type of tissue?
What type of artifact occurs when a voxel contains more than one type of tissue?
What is the main characteristic of beam-hardening artifacts?
What is the main characteristic of beam-hardening artifacts?
What type of artifact is caused by cardiac motion?
What type of artifact is caused by cardiac motion?
What is the main purpose of using thin slices in imaging?
What is the main purpose of using thin slices in imaging?
What is the classification of artifacts based on their causes?
What is the classification of artifacts based on their causes?
What is the result of patient motion during a scan?
What is the result of patient motion during a scan?
How can involuntary motion be reduced?
How can involuntary motion be reduced?
What type of artifact is caused by objects in the field of view?
What type of artifact is caused by objects in the field of view?
How can non-removable metal objects be managed?
How can non-removable metal objects be managed?
What is the typical appearance of a ring artifact?
What is the typical appearance of a ring artifact?
What can cause a ring artifact?
What can cause a ring artifact?
How can a ring artifact sometimes be eliminated?
How can a ring artifact sometimes be eliminated?
What is tube arcing?
What is tube arcing?
What is the typical appearance of a tube arcing artifact?
What is the typical appearance of a tube arcing artifact?
What is the remedy for a tube arcing artifact?
What is the remedy for a tube arcing artifact?
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.
