Cabinets with Electronic Components
The Main Electronic Cabinet (1) contains
- ▪
- the line power distribution (LDU),
- ▪
- the components for the small signal generation of excitation RF pulses and MR signal reception (TRX 1200),
- ▪
- the gradient timing unit (GTU),
- ▪
- the gradient and shim interfaces to generate the signals for the power amplifiers,
- ▪
- the embedded processing unit (EPU),
- ▪
- as well as the safety controller that disables various components in case of misoperation.
In addition, most configurations also have the RF power amplifier(s) (RFPA BLA) and the shim amplifier (BSPS) located therein. The gradient power amplifier (GPA) is in a separate cabinet (2). Optional, the instrument can be equipped with up to 16 transmit/receive channels which then require additional space in cabinet (3).
For BioSpec instruments, the dual loop heat exchanger (DLHE 4a) needs to be supported by cold primary water from the house installation. The heat exchanger uses this to provide two secondary water circuits for thermally stabilized cold water to cool the gradient coil and the refrigerator of the USR or US/R magnet.
Typical BioSpec configuration: (1) Main Electronic Cabinet, (2) GPA, and (4a) DLHE. Cabinet (3) is optional.
The PharmaScan magnet does not need cooling water so that a stand-alone chiller (air/water) to provide gradient coil cooling water is sufficient (4b).
Typical PharmaScan configuration: (1) Main Electronic Cabinet, (2) GPA, and (4b) chiller for gradient coil cooling water.