Related Experiment Videos
Chemical shift misregistration effect in magnetic resonance imaging
Radiology
|December 1, 1984
Summary
Chemical shift misregistration causes artifacts on MR images, appearing as low or high intensity signals near fat and kidney or liver tissue. Recognizing this artifact is crucial to prevent misdiagnosing calcifications or fluid collections.
Area of Science:
- Radiology
- Medical Imaging
- Physics
Background:
- A low-intensity artifact at the perirenal fat-renal parenchyma junction in MR images has been noted.
- Symmetrical high-intensity artifacts also appear adjacent to kidneys and liver/adipose tissue.
Purpose of the Study:
- To explain the origin of observed MR imaging artifacts.
- To highlight the clinical significance of identifying these artifacts.
Main Methods:
- Analysis of MR imaging characteristics.
- Explanation based on chemical shift principles.
Main Results:
- Both artifacts are attributed to pixel misregistration.
- This misregistration results from differing chemical shifts between fatty and non-fatty tissues.
- Artifacts manifest as signal intensity variations at tissue interfaces.
Conclusions:
- The described artifacts are manifestations of the chemical shift misregistration effect.
- Accurate identification is vital to avoid misinterpreting artifacts as pathological findings like calcifications or fluid collections.