MRI ARTIFACTS What are artifacts? Artifacts are
Description: MRI ARTIFACTS What are artifacts? Artifacts are simply signal misrepresentations that do not correspond to the location of the specific tissue imaged. What causes artifacts? The Patient Subject Magnetic Field Inhomogeneity Machine Hardware
Related Topics
Download Presentation
"MRI ARTIFACTS What are artifacts? Artifacts are" is the property of its rightful owner. Permission is granted to download and print the materials on this website for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Presentation Transcript
slide1. MRI ARTIFACTS<br>
slide2. What are artifacts? Artifacts are simply signal misrepresentations that do not correspond to the location of the specific tissue imaged.<br>
slide3. What causes artifacts? The Patient/ Subject
Magnetic Field Inhomogeneity
Machine Hardware<br>
slide4. Motion artifact seen as a smearing across an image.
Primarily caused from patient/subject voluntary movement
Can be caused by involuntary movement such as:
Oesophageal contraction/ vascular pulsation during head and neck imaging
Respiration/ cardiac activity during T-spine/Abdominal imaging
Bowel peristalsis during pelvic imaging<br>
slide5. MAGNETIC SUSCEPTABILITY Artifacts resulting from the presence of metallic objects.
Distorts nearby structures & causes signal loss<br>
slide6. Aliasing/ wrap around artifact Occurs when tissue outside the field of view is under sampled, causing misregistration of anatomic location.
Easily identified by the superimposition/incorrect location of anatomy<br>
slide7. Zipper artifact A Leak in the RF shielding
Can appear due to inadequate door suction in the MR scan room.<br>
slide2. What are artifacts? Artifacts are simply signal misrepresentations that do not correspond to the location of the specific tissue imaged.<br>
slide3. What causes artifacts? The Patient/ Subject
Magnetic Field Inhomogeneity
Machine Hardware<br>
slide4. Motion artifact seen as a smearing across an image.
Primarily caused from patient/subject voluntary movement
Can be caused by involuntary movement such as:
Oesophageal contraction/ vascular pulsation during head and neck imaging
Respiration/ cardiac activity during T-spine/Abdominal imaging
Bowel peristalsis during pelvic imaging<br>
slide5. MAGNETIC SUSCEPTABILITY Artifacts resulting from the presence of metallic objects.
Distorts nearby structures & causes signal loss<br>
slide6. Aliasing/ wrap around artifact Occurs when tissue outside the field of view is under sampled, causing misregistration of anatomic location.
Easily identified by the superimposition/incorrect location of anatomy<br>
slide7. Zipper artifact A Leak in the RF shielding
Can appear due to inadequate door suction in the MR scan room.<br>