MRI artifacts are generated by multiple sources including:
Artifacts impair image quality causing blurring of the imaged object resulting in misleading pathologies and need for rescans.
They also obstruct diagnostic-quality ECG monitoring for heart-rate variability, arrhythmia, PVC, ischemia, etc.) during MRI exams, resulting in risks to patient safety.
MHD effect (see image below), is considered a prime artifact because of its corrupting affect on ECG ST segments
MHD Effect is the induction of a voltage in a conductive fluid, flowing through a magnetic field, . . . a well known phenomenon in fluid mechanics called the magneto-hydrodynamic (MHD) effect.
As soon as a patient is placed in the MR bore, and prior to scanning, they are under the influence of the MHD effect. This causes an amplitude increase in the T-wave of the EKG, which is frequently confused with the R-wave or standard "trigger point".
As magnet strengths increase, so do artifact impacts, in particular MHD.
Magnet Strength: The ECG image (right) shows an ECG taken outside the magnet ("0 T").
At 1.5 T, the MHD impact shows an alteration of the T-wave and distortion of the T-Q wave, which becomes much stronger at 3.0 T.
By cleanly separating signals obtained during MRI procedures, ACDx can:
improve gating and triggering accuracy to produce reliably clearer images, even during cardiac events.
Clearer images mean fewer rescans, shorter exam times and increased MRI throughput.
Full, real-time diagnostic-quality ECG monitoring means, during procedures, you can reliably monitor your patient's heart-rate & heart-rate variability, PVCs, arrhythmic and ischemic occurrences with early-warning of any ECG complications.
With ACDx, you will be able to monitor your patient's blood-flow while scanning.
Synchronized image and physiologic data reports will be available on a pay-per-click basis, providing greater evaluation intelligence.
We anticipate new clinical and research applications to emerge from ACDx capabilities, enabling users to go beyond current Gating & Monitoring limitations.