ETS-Lindgren's digital Magnetic Active Compensation System (MACS/D) provides cost-effective, maintenance-free high performance attenuation of dynamic environmental magnetic fields for magnetic resonance imaging (MRI) and spectroscopy (NMR/EPR) sites. The MACS/D system incorporates ACR technology (U.S. patent 9,692,391 B2), which provides higher compensation at the magnet's isocenter than other active compensation systems, with effective attenuation factors in the isocenter of up to 350 versus 40 or less attainable by competing systems. Custom high-power coil drivers provide constant attenuation over a wide dynamic range that can extend to 45 Tesla (450 mGauss) with standard coil sets in each of the three axes. Additionally, the MACS/D high efficiency, low dissipation coil driver amplifier insures long-term system reliability at sites with frequent high-level interfering field levels.
Signal processing within the MACS/D system is accomplished entirely in the digital domain by a 450 MHz DSP engine. For ACR magnet isocenter attenuation enhancement, the digital processing algorithm applied in real time to the compensating signal includes modeling of the magnet's external to isocenter transfer characteristic.
For operator convenience, the MACS/D controller front panel screen provides three-axis residual magnetic field scrolling displays, with text descriptions of instantaneous axial field values, the MACS/D system configuration, system state, time and date, and LAN IP. An embedded machine control computer provides full LAN-based capability for site setup and remote diagnostic viewing that includes real-time HTML-based monitoring displays of up to 35 parameters. Additionally, password protected access to MACS/D standard and advanced operational parameters, DSP coefficients and system configuration is included in the standard software package. VPN client support is available for secure remote data logging and diagnostics, and the VPN support ensemble also includes provision for downloading of software upgrades.
ETS-Lindgren MACS/D systems for MRI and magnetic resonance spectroscopy employ traditional negative feedback, but with wideband, high resolution state of the art signal processing entirely in the digital domain, permitting incorporation of complex ACR algorithms to enhance performance. Tri-axial compensation provides additional attenuation in all axes by minimizing field gradients through the magnet volume. Along with the flexibility of the DSP based technology, the MACS/D provides superior compensation for higher order effects attributable to residual environmental field gradients and the MRI magnet's frequency-dependent response to such fields.
MACS/D ACR technology, fast, high-resolution DSP based conversion and computing and universal architecture provides maximum software and firmware flexibility, enabling the MACS/D to be locally and remotely updated with software upgrades, maximizing long-term utility. From a reputation as industry leader with over 100 high performance MACS MRI installations worldwide, introduction of the MACS/D system advances ETS-Lindgren to a preeminent position of currently sourcing the world's premier active compensation system, specifically tailored for MRI sites.
Read the recent White Paper on this system: ACTIVE MAGNETIC FIELD COMPENSATION SYSTEMS A COMPARATIVE STUDY
Width: 53.34 cm (21 in)
Height: 22.9 cm (9 in)
Length: 43.18 cm (17 in)
Weight: 27.22 kg (60 lb)