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
Electrical voltages are generated bytThe MRI's gradient switching, magneto-hydrodynamic effect (MHE) and multiple types of body motion. These voltages interfere with ECG morphology obstructing image synchronization, diagnostic-quality ECG monitoring and robust decision-support data availability.
As soon as a patient is placed in the MR bore, and prior to scanning, they are under MHE influence which causes an amplitude increase in the T-wave of the EKG, which is frequently confused with the standard "trigger point". This, plus artifacts caused by current multiple filtering methods, impairs image quality, safety monitoring and acquisition of physiological data (ECG, blood-flow) that can be extremely helpful to determine patient health assessments and treatment decisions.
As magnet strengths increase, so do their related artifact impacts, in particular MHE.
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.