Even absent remote monitoring or control, the MACS/D will resume normal operation in compensation mode with most recent parametric settings after a.c. power interruptions or even in the unlikely event of a Machine Control Computer (MCC) failure. At start-up, the system performs comprehensive self-tests under MCC control to confirm hardware and software integrity. In the event of an MCC failure, the MACS/D system remains operational and the front panel displays a warning notice advising the site operator to contact system service personnel.
MCC (Linux-based Machine Control Computer).
Remote Internet access via VPN client (typically in conjunction with an ETS-Lindgren managed VPN server) provides maximum network security. The VPN client provides the ability to remotely and securely monitor, troubleshoot, repair, diagnose, and update firmware/software from any Internet access point.
The MACS/D has significantly more powerful coil drivers than previous versions or any competing system, resulting in an additional 100% or better field compensation ability in each of the 3 axes, typically >45uT peak, depending on coil cable type and room geometry. Switch mode amplifier architecture provides up to 500W of output power per axis at 90% efficiency.
The front panel LCD displays real-time field level monitoring, system status, time and date, local IP address, system configuration, and warning/error messages. In the event of MCC failure, the system continues to provide field compensation with the same parameters but an error message is presented in place of the normal readout display.
MACS/D-MRI-ACR (MMA) Controller front panel display: (1a) Field Level Monitor, provides readouts and 1 minute, 1 sample/second scrolling record of averaged magnetic field absolute magnitude; (1b) System Status, displays system machine state, "OPERATE" indicates normal operative condition; (1c) Time and Date, automatically updated when accessing VPN server, maintained by local reference clock when external lookup not available; (1d) Local IP Address, DHCP or fixed, displays "No IP Address" if LAN is not connected or is inoperative; (1e) System Configuration, displays configuration in format "MxA", where "x" indicates the application, for MRI sites the configuration is "MMA" as shown.
LAN/Remote monitoring includes independent selection of all or any subset of system readable variables (see specifications, below), updated on a 1 reading/second chart or charts.
calibration requires only uncomplicated adjustment of the axial output gain
settings, which are room geometry and probe location dependent, and a
subsequent adjustment of the ACR level parameter for each axis, which is
primarily dependent on the MRI magnet isocenter susceptibility to external magnetic
fields. These setup parameter values are stored in nonvolatile memory and are
reloaded at each power-up occurrence.