The MRI smart amplifiers incorporate advanced signal processing circuitry which removes spurious MRI artifact from the source physiological data. Signal processors are able to distinguish between physiological signal and MRI artifact as manifested by gradient switching during MRI sequences, such as Shim or EPI.
Because MRI-related transient artifact is removed at the source, the MRI version amplifier can be sampled at the same rate as during normal (non-MRI) physiological recording. There is no longer any requirement to over-sample the amplifier output to capture every nuance of MRI artifact to train secondary computer-based processing steps to remove such artifact.
In every aspect, data recording is easier and the final results are cleaner when using the MRI version amplifiers to record physiological data in the fMRI or MRI.
Features: 1) Less sensitivity to electrode and transducer lead placement
2) Improved gain selectability
3) No missing spectra in physiological signal frequency band
4) No requirement for acquisition oversampling
5) Minimizes computer-based real-time or post-processing signal processing
6) Cleaner data available as real-time analog output
The ECG100C-MRI Electrocardiogram Amplifier records electrical activity generated by the heart and will reliably record ECG from humans, animals and isolated organ preparations. The amplifier output can be switched between normal ECG output and R-wave detection. The R-wave mode outputs a smoothed pulse with the occurrence of each R-wave. The exact timing of the R-wave is detected even under conditions of extreme signal artifact. The amplifier also includes a user-switchable baseline stabilizer. Use the AcqKnowledge software to provide a complete Lead II ECG analysis. The software automatically scores the data and extracts the measurements of interest on a cycle-by-cycle basis. The results are automatically exported to Excel or pasted in the Journal file. AcqKnowledge also includes a fully automated HRV analysis feature. The HRV analysis provides values for VLF, LF, HF, VHF, sympathetic, and vagal, as well as the sympathetic / vagal balance.
12-lead ECG Options
For full, simultaneous, 12-lead ECG recording, use a total of eight ECG100C-MRI amplifiers and a WT100C Wilson terminal (virtual reference). Use two ECG100C-MRI to record Leads I and II, from which the software will calculate Lead III, aVR, aVL and aVF, and use six ECG100C-MRI to simultaneously generate the six precordial chest leads (V1-V6).
MRI/CT Scan Trigger Option
To trigger an MRI System or CT Scanner with the occurrence of the R-wave present in animal (high frequency) ECG or respiratory data for gating purposes, use the DTU100 Digital Trigger Unit or the DTU200 Gating System.
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