diffusion tensor imaging artifact
Signal distortions in DTI sequences caused by eddy currents, motion, or field inhomogeneities that compromise fiber tracking accuracy.
Full Definition
Diffusion tensor imaging artifacts are systematic signal distortions that occur during DTI acquisition and can significantly impact the quality of white matter tractography results. Common sources include eddy current distortions from rapid gradient switching, patient motion between diffusion-weighted volumes, and magnetic field inhomogeneities near air-tissue interfaces. These artifacts manifest as misalignment between diffusion volumes, signal dropout, or geometric distortion that can lead to false fiber tract reconstructions. Proper correction protocols including eddy current compensation and motion correction are essential for reliable clinical interpretation.
Usage
Usage note: Use the full term in formal reports; avoid abbreviated forms that may be unclear to referring clinicians.
In Context
- "The radiologist noted significant diffusion tensor imaging artifacts in the temporal lobe regions, requiring sequence repetition." — Clinical radiology report
- "Quality assurance protocols must include systematic evaluation for diffusion tensor imaging artifacts before tractography analysis." — Imaging protocol documentation