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ACGD
| Advanced Concept Gradient Driver |
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AGP
| Applications Gateway Processor [Board] |
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AP
| Array Processor Board |
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APM
| Analog Power Monitor [Board] |
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APS
| Auto prescan: Auto-adjustment of data acquisition (scan) parameters |
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APS
| Acquisition Processing System [Board] |
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AVS
| Auto voxel shim |
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AWS
| Automatic Water Suppression |
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BRM
| Body Resonance Module |
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CAN
| Control Area Network [Board] |
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CCC
| CAN Core Communication [Board] |
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CRM
| Cardiac Resonance Module |
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CRT
| Cathode Ray Tube |
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CRYOGEN
| A substance for producing low temperatures. Liquid helium is the cryogen used to cool the magnet to approximately 4 Kelvin (269 C or 452 F). |
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CRYOSTAT
| An apparatus maintaining a very low constant temperature. The cryostat consists of one concentric, cylindrical container housed in an outer vacuum tight vessel. The magnet and shim coils are mounted in the inner container. The container is filled with liquid helium. The shields surrounding the inner container are kept cold by a refrigeration device. |
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CV
| Control variable |
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DCB
| Driver Control Board |
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DEWAR
| A container with an evacuated space between two highly reflective walls used to keep low temperature substances at nearconstant temperatures. Liquid helium is usually stored and shipped in dewars |
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DM
| Driver Module |
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DRF1
| Digital Receive Filter 1 [Board] |
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DSP
| Digital Signal Processing |
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EXCLUSION ZONE
| Area where the magnetic flux density is greater than five gauss. Personnel with cardiac pacemakers, neurostimulators and other biostimulation devices must NOT enter this zone. Signs are posted outside the five gauss line alerting personnel of this requirement. Since the magnetic field is threedimensional, signs are also posted on floors above and below the Magnet Room in which the five gauss line exists. |
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FERROUS MATERIAL
| Any substance containing iron which is strongly attracted by a magnetic field. |
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FO
| Fiber Optic |
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FOV
| Field of View |
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FPIO
| Front Panel Input/Output [Board] |
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FWHM
| Full Width Half Max |
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GAUSS (G)
| A unit of magnetic flux density. The earths magnetic field strength is approximately one half gauss to one gauss depending on location. The internationally accepted unit is the tesla (1 Tesla = 10,000G and 1 milli Tesla =10G). |
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GP
| Gradient Processor [Board] |
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GRADIENT
| The amount and direction of the rate of change in space of the magnetic field strength. In the magnetic resonance system, gradient amplifiers and coils are used to vary the magnetic field strength in the x, y, and z planes. |
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GRx
| Graphic Prescription |
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HFA
| High Fidelity Gradient Amplifier |
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HFD
| High Fidelity Gradient Driver |
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HOMOGENEITY
| Uniformity. The homogeneity of the static magnetic field is an important quality of the magnet. |
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ICN
| Image Compute Node. A component with an internal operating system (similar to a PC) used for Image reconstruction in the VRE. Contains hard drives and an operating system |
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ICW
| Installation Calibration Wizard. This wizard is available in two different modes: Install and Upgrades. It can be found in the proprietary Common Service Desktop under the "Calibration" tab. Maintenance mode is available after all calibrations and tasks in the install mode are complete. |
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IFCC
| Image file create and cleanup |
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INFINIBAND
| High-speed communication, analogous to Ethernet but much higher speed and capacity. Used for transporting large amounts of data for within the volume reconstruction subsystem |
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IRF
| Interface and Remote Functions [Board] |
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IRF I/O
| Interface and Remote Functions Input/Output [Board] |
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ISOCENTER
| Center of the imaging volume ideally located at the magnet center. |
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ISOGAUSS LINE
| An imaginary line or a line on a field plot connecting identical magnetic field strength points. |
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IT Host
| Image Transfer Host [Board] |
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IT-MGD
| Image Transfer-MGD [Board] |
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LCD
| Liquid Crystal Display |
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LED
| Light Emitting Diode |
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LO
| Local Oscillator |
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LPCA
| Low Profile Carriage Assembly |
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MAGNETIC FIELD (H)
| The space around a magnet (or current carrying conductor) which can produce a magnetizing force on a body within it |
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MAGNETIC RESONANCE (MR)
| The absorption or emission of electromagnetic energy by nuclei in a static magnetic field, after excitation by a suitable radio frequency field. |
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MAGNETIC SHIELDING
| Using material (e.g. steel) to redistribute a magnetic field , usually to reduce fringe fields. |
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MC
| MultiCoil |
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MCD
| MultiCoil Driver [Board] |
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MCQA
| Multi Coil Quality Assurance. This is a tool that will check the coil SNR and be able to trend it for each coil over time. |
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MGD
| Multi-Generational Data acquisition [Chassis] |
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MPS
| Manual prescan: Manual adjustment of data acquisition (scan) parameters |
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MRS
| Magnetic Resonance Spectroscopy |
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MUX
| Multiplexor [Board] |
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NEX
| Number of excitations |
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OM
| Oxygen Monitor |
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OW
| Operator Workspace |
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PAC
| Physiological Acquisition Controller |
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PCI
| Peripheral Component Interconnect |
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PDU
| Power Distribution Unit |
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PMC
| PCI Mezzanine Connecter |
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PP
| Penetration Panel |
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PRESS
| Point-resolved spectroscopy, basis for probe-p PSD |
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PROBE/Q
| Automated analysis and display of PROBE/SV data |
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PROBE/SV
| PROton Brain Exam Single Voxel spectroscopy using automated STEAM or PRESS pulse sequence |
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PS
| Power Supply |
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PSD
| Pulse sequence data base |
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PT
| Patient Transport or Patient Table |
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QUENCH
| Condition when a superconducting magnet becomes resistive thus rapidly boiling off liquid helium. The magnetic field reduces rapidly after a quench. |
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RADIO FREQUENCY (RF)
| Frequency intermediate between audio frequency and infrared frequencies. Used in magnetic resonance systems to excite nuclei to resonance. Typical frequency range for magnetic resonance systems is 580 Mhz. |
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RADIO FREQUENCY SHIELDING
| Using material (e.g. copper, aluminium, or steel) to reduce interference from external radio frequencies. A radio frequency shielded room usually encloses the entire magnet room. |
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RECON
| Process that creates an image or spectrum from data acquired with a Signa MRI scanner. |
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RESONANCE
| A large amplitude vibration caused by a relative small periodic stimulus of the same or nearly the same period as the natural vibration period of the system. In magnetic resonance imaging, the radio frequency pulses are the periodic stimuli which are at the same vibration period as the hydrogen nuclei being imaged. |
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RF
| Radio Frequency |
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RF-DIF
| RF-Digital Interface [Board] |
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RFI
| RF Interface [Module] |
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ROI
| Region of Interest |
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RPC
| Remote Control Panel (TwinSpeed only) |
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RRF
| Remote RF [Chassis] |
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RSP
| Real-time sequence control parameters |
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S/C
| Super Conducting |
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SAT
| Saturation, a signal suppression technique |
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SCP
| Scan Control Processor [Board] |
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SCSI
| Small Computer System Interface |
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SGA
| Switchable Gradient Amplifier [Module] |
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SHIELD COOLER COLD HEAD
| An external refrigeration device which maintains the shields inside the cryostat at a constant temperature. |
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SHIM COILS
| Shim coils are used to provide auxiliary magnetic fields in order to compensate for inhomogeneities in the main magnetic field due to imperfections in the manufacturing of the magnet or affects of steel in the surrounding environment. |
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SHIMMING
| Correction of inhomogeneity of the main magnetic field due to imperfections in the magnet or to the presence of external ferromagnetic objects. |
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SMC
| System Monitor and Control |
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SPU
| Signal Processing Unit |
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SRF
| Scalable RF [Cabinet] (this is same as SRFD) |
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SRF/TRF
| Sequencer Related Function / Trigger and Rotation Function [Board] |
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SRFD
| Scalable RF Driver [Cabinet] |
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SRFD2
| Scalable RF Driver 2 [Cabinet] |
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SRI
| Scan Room Interface [Module] |
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SSM
| System Support Module |
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STEAM
| Stimulated echo acquisition mode, basis for PROBE-s PSD |
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STIF
| SRF/TRF Interface [Board] |
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SUPER CONDUCTING MAGNET
| A magnet whose magnetic field originates from current flowing through a superconductor. Such a magnet is enclosed in a cryostat. |
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SUPERCONDUCTOR
| A substance whose electrical resistance essentially disappears at temperatures near zero Kelvin. A commonly used superconductor in magnetic resonance imaging system magnets is niobiumtitanium embedded in a copper matrix |
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T1
| The characteristic time constant for the magnetizations return to the longitudinal axis after being excited by an RF pulse. Also called Spin Lattice or Longitudinal Relaxation Time. |
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T1-Weighted
| Scan protocols that allow the T1 effects to predominate over the other relaxation effects. |
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T2*
| The characteristic time constant for loss of transverse magnetization and MR signal due to T2 and local field inhomogeneties. Since such inhomogeneities are not compensated for by gradient reversal, contrast in gradient-echo images depends on T2*. |
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T2*-Weighted
| Scan protocols that allow the T2* effects to predominate over the other contrast effects. There are three primary gradient echo pulse sequences that can be used to produce varying T2*-weighted images: Gradient Echo, SPGR, and SSFP. |
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T2
| The characteristic time constant for loss of phase coherence among spins, caused by their interaction, and the resulting loss in the transverse-magnetization MR signal. Also referred to as Spin-Spin or Transverse Relaxation Time. |
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T2-Weighted
| Scan protocols that allow the T2 effects to predominate over the other contrast effects. |
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TE Min
| The shortest possible TE time for a given prescription, used to minimize flow dephasing and T2 effects. |
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TE
| See Time to Echo. |
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TE1
| The time from the middle of the first excitation pulse to the middle of the first readout in an Asysmmetrical Spin Echo pulse sequence. |
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TAC
| Twin Accessory Cabinet (TwinSpeed only) |
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TE
| Echo time |
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TE2
| The time between the middle of the first excitation pulse and the middle of the second readout in an Asysmmetrical Spin Echo pulse sequence. |
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TESLA (T)
| The internationally accepted unit of magnetic flux density. One tesla is equal to 10,000 gauss. One milli Tesla is equal to 10 gauss. |
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TGWC
| TwinSpeed Gradient Water Cooler |
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Time to Echo (TE)
| The time between the center of the excitation pulse and the peak of the echo, which usually occurs at the center of the readout. |
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Time-of-Flight (TOF) Angiography
| A 2D or 3D imaging technique that relies primarily on flow-related enhancement to distinguish moving from stationary spins in creating MR angiograms. Blood that has flowed into the slice will not have experienced RF pulses and will therefore appears brighter than stationary tissue. |
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TOF Angiography
| See Time-of-Flight Angiography. |
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TIR
| Tardis Image Receive |
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TNS
| Transient Noise Suppressor [Module] |
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TP
| Test Point |
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TPS
| Transceiver and Processing subsystem |
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TPS
| Transceiver Processing and Storage |
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TR
| Repetition time |
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TRM
| Twin Resonance Module |
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TRM
| Twin Resonance Module (TwinSpeed only) |
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TSCC
| TwinSpeed Cooling Cabinet |
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UART
| Universal Asynchronous Receive Transmit [Device] |
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UTNS
| Universal Transient Noise Suppressor [Board] |
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VOI
| Voxel of interest |
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VRE
| Volume Recon Engine |
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WARP
| Waveform and Rotation Processor |
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WC
| Water Chiller |
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WIM
| Workspace Interface Module |
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WS
| Water Suppression |
