Technologist Track Session 1: CMR Technical Methods (2019)-CMR Artifacts

Video Transcription

Video Summary

The speaker, a cardiac MRI technologist, gives a practical overview of common MRI artifacts, focusing on how to prevent, identify, and work around them in clinical scanning. Key topics include ghosting from cardiac and respiratory motion, wraparound artifact, field inhomogeneity/susceptibility issues, metal implant artifacts, and blood-flow aliasing. For motion artifacts, the speaker emphasizes patient preparation, good ECG setup, rhythm detection, trigger window adjustment, fast/real-time cine imaging, and breath-hold coaching. For wraparound, solutions include changing phase direction, increasing field of view, or using oversampling. Field inhomogeneity can be improved with shimming and center-frequency adjustments, especially at 3T. Metal artifacts may be reduced with gradient echo sequences and parameter changes, though some implants cause unavoidable signal loss. For flow imaging, venk must match expected velocity to avoid aliasing. Overall, the message is that careful preparation and parameter tuning are essential to producing diagnostic-quality MRI images.

Keywords

MRI artifacts

cardiac MRI

motion artifact

wraparound artifact

susceptibility artifact

blood-flow aliasing