GE Profile III Open MRI

Specifications:

  • Manufactured in October 1998
  • Magnet: Permanent Open 0.2T
  • Software Version: 7.6
  • Gradients: 15 mT/m
  • Slew Rate: 25 T/m/Second

Coils:

  • Head Coil
  • Extremity Coil
  • 9” General Purpose
  • 11” General Purpose
  • Body Flex II. (Large)
  • Body Flex. (Medium)
  • Body Flex II (XL)

The GE Profile III Magnetic Resonance System is a High Resolution, Whole Body Imaging System Using an Innovative Open Magnet Design, Operating at 0.2 Tesla.

The System Has Been Designed to Provide Openness and Patient Comfort for a wide range of Examinations while Providing Excellent Diagnostic Image Quality. The Signa Profile System Provides Performance of Routine and Specialized Clinical Examinations including Diagnostic Imaging of the Central Nervous System, Body, Joints, Extremities, and Vascular Anatomy Using a Comprehensive Range of Proven Pulse Sequences and Image Enhancement Techniques

The Signa Profile System Consists of:

  • A Compact Open Magnet With Enclosure
  • High Performance Gradient System for Reduced Scan Times and increased Scanning Flexibility
  • Advanced Digital RF System for Single Channel Receive and Future Expandability to Multiple Channel Receive Operation
  • Application Specific Imaging Coils
  • Ergonomic Operator Workstation with 19 inch High Resolution/High Luminescence Black and White Monitor, and Integrated Physiological Waveform LCD Display
  • Icon Driven, Single Screen, Intuitive User Interface Enhances System productivity
  • Distributed Processing Architecture allows Multiple Functions – Including Simultaneous Data Acquisition and Reconstruction to Help Increase System Productivity
  • Patient Table That Includes Lateral Movement to Facilitate Scanning at magnet Isocenter for Off-Axis Examinations

Magnet:

Permanent, NdFeB Material, Vertical Field Magnet Operating at 0.2 Tesla.

Enclosure Control Panel is Located Above the Patient Table to Activate:

  • Table Motion (Lateral And In/Out)
  • Alignment Lights and Landmark
  • Scan Start, Pause, And Stop
  • Status Indicator Display Is Locate On Magnet Enclosure, Indicating:
  • Cradle Position
  • Remaining Scan Time
  • System Status
  • Safety Controls Include An Emergency Of f Switch Located On both The operator Workstation And Magnet Enclosure.

Patient Comfort Features:

  • Two-Way Intercom
  • Mirror Incorporated In Head Coil
  • Patient Call Button

Gradient Subsystem:

Signa Profile System Includes a High Efficiency Flat Gradient Coils and Software Controlled Digital Eddy Current Compensation, Designed to minimize Gradient-Induced Eddy Currents and to provide Controlled and Uniform Gradient Magnetic Fields in the X, Y, and Z Planes.

  • Operating Amplitude: l5 mT/m
  • Rise Time to l0 mT/m: 600 microseconds
  • Slew Rate: 25 T/m/s

Radio Frequency Subsystem:

Digital Transceiver

Digital Transceiver Permits Proton Imaging at 8.5 MHz (for 0.2T Operation)

Digital RF Synthesizer Allows precise Phase Sensitive Techniques With Elimination of Induced Phase Error Image Artifacts.

The Advanced Digital Filter Eliminates Frequency Wraparound. In Addition, New Frequency Domain Digital Filtering techniques:

  • Further Reduces Phase Errors Compared to Standard Time-Domain Digital Filtering Methods
  • Provide Superior Filtering at High Data Collection Bandwidths required for fast-Imaging Techniques.

RF Coils

Saddle Transmit Body Coil is Contained inside the Magnet enclosure. Active Decoupling of Body Coil Enhances Surface Coil Imaging Quality, Particularly With Large Surface Coils, Allowing High Resolution surface Coil Imaging of Larger Anatomical Structures.

Quadrature Receive Head coil Has an inside Diameter of 27 cm (11 Inches) Open Design Incorporates Coil, Head Holder and Adjustable Mirror System to Promote Patient Comfort.

Quadrature Receive, Flexible Form Factory Body Coils Have a 48cm (19 1nches) Length with widths of:

  • 120cm (47 inch) or Medium Size
  • 150Cm (59 inch) for Large Size

The 9 Inch General purpose Coil is a Receive Only Split-Type Design Solenoid Coil Designed for Imaging of the Shoulder, Knee, Ankle and C-Spine.

  • RF Power: 2 kW
  • RF Power Output is Limited Via Hardware and Software Controls, System is Designed not to Exceed a Pre-Programmed Rate of Power Deposition per Kilogram of Patient Body Weight.
  • Dynamic Bandwidth Capability Allow Operator to select bandwidth for optimized SNR.

Operator Workstation:

The Signa Profile Operator Workstation is ergonomically Designed for Ease of Use and Overall operator Comfort, Including:

  • LCD Color Monitor
  • Monitor is Shielded to Operate in a Maximum Static Magnetic Field of up 10 Gauss
  • An Integrated Physiological Waveform Liquid Crystal Display (LCD) provide Visualization of Respiratory and Cardiac Cycle Information.
  • Intercom System. Consisting of a Speaker, bi-directional Microphone and volume Controls Allows Communication with the Patient at all Times.

Data Processing System

Dedicated High Speed Computer Processor for Simultaneous Prescription, Pause Sequence control, Data Collection and Reconstruction. Specific Subsystems Include:

  1. Stand-Alone Host Computer With 256 Megabyte Main CPU Memory, Expandable to 384 Megabytes.
  2. Pulse Sequence Controller Provides Real Time, High Resolution Waveform Generation With Ten Nanosecond Resolution.
  3. Reconstruction Array Processor With 92 Megabytes Bulk Acquisition Memory Standard, Expandable to 512 Megabytes. 94 Milliseconds FFT Time per 256 x 256 Image. Scan and Reconstruction Modes Run Simultaneously.
  4. Hard Disk capacity of 2.1 GB and storage for approximately 6000 256*256 matrix images.

Operational Specifications:

User Interface

New Graphic User Interface on the Signa Profile System is Designed to Promote Ease-of Use and Fast, Simple Operation. Icons and One Screen operation Simplify Scan Set up and Display. Standard Features Provide Automated Operation of Scan, Patient Management and Data Management Processes. These Features Include:

  • Patient Registration: Patient Information is Entered Prior to Patient Arriving Saving Time and Improving Efficiency. Multiple Patients can be Pre-Registered and Stored in System Memory.
  • Protocol Link: Pre-defined or Custom Protocols can be Linked to Register Patient Information. Selection of the Patient Name Will Automatically Download Scan Information. The Operator Need only Make One Selection to be Ready to Scan.
  • Prescription Manager: Prescription, Modification and Control of Acquisition is Organized by the Prescription manager. Multiple Series can be Prescribed and Ready to Scan. Scan Location, SAT Locations and Scan Parameters can Easily be Repeated by selecting the Copy Feature. This Makes Pre/ Post Contrast Ob1ique Exams Easier to Prescribe.
  • Auto-Scan: When Activated, This Feature Will Initiate All Prescribed scans with Simplified Operator Interaction. The operator Prescribes All Series in one section and Selects Auto-scan
  • Auto-View: Images Automatically Display at the End of Acquisition for Quick review Standard System Provides 70 Auto-View Images of 256 x 256 Matrix Expandable to 420 Images With 354 MB.
  • “Desktop” Organization: Each process is Assigned a Dedicated “Desktop” Providing Organization and Ease-of-Use. Desktop Icons Represent Scan, Display, Protocol Management, Image Management, GE Tools and Dedicated Software Packages.

Application Programmed Protocols:

Pre-programmed , Pre-defined Protocols provide Anatomic Specific Acquisition Parameters. Customers Can Use the GE Protocols or Build Their Own Site-Specific Protocols.

Scan Orientation:

Direct Axial, Sagittal, Coronal, Oblique and Double-Oblique Plane Imaging

Acquisition Modes:

  • 2D: Multi-slice Images, Including Contiguous Slices
  • 3D: Volume Imaging Including 12 to 124 slice Locations in Increments of Two, Depending on Pulse Sequence Chosen.

Standard Pulse Sequences

  • 2D Inversion Recovery (IR)
  • 2D Spine Echo (SE)
  • 2D Sequential and 3D Volume Gradient Echo Acquisition (GRE)
  • 2D Multi-planar Gradient Echo (GRE)
  • 2D/3D Spoiled gradient Echo (SPGR)
  • 2D Time of Flight (TOF)
  • 3D Time of Flight

Imaging Parameters

The Following Enhancements are Compatible With the Various Pulse Sequences: Flow Compensation, Respiratory Compensation, Respiratory Triggering, ECG Triggered Cardiac Gating, Peripheral Pulse Gating, Graphic Prescription, Spatial Saturation Techniques, Including Graphic Saturation Prescription, No Phase Wrap, Phase Offset Multi-Planar (POMP), Variable bandwidth, Image Intensity Correction, Extended Dynamic Range, Phase Offset, Asymmetric FOV (Square Pixel and Phase FOV), Odd Nex, and Autoshim.

Slice Thickness/Spacing:

  • 2D: 2.7 to 20 mm Slice Thickness in 0.1 mm Increments (Depending on Pulse Sequence)
  • Operator Variable Interslice Spacing Increments as Small as 0.1 mm. Interlease Option for Multi-Slice Imaging.
  • 3D: 12-124 Contiguous Slice Imaging, Depending on Chosen Pulse Sequence, 0.5 to 5.0 mm Slice Thickness in 0.1 mm increments.

Field of View:

  • 6 to 40 cm in 1 cm Increments, Contiguous in All Planes.
  • Ability to Scan Asymmetric FOV and off center FOV in Frequency and Phase Directions.

Acquisition Matrix Size:

Phase Encoding From 128 to 512 in steps of 32. Frequency Encoding From 128 to 512 in Steps of 32.

Acquisition Times and Pulse Acquisition Ranges:

By Selecting the Number of Excitations (NEX), Repetition Times (TR), Number of phase Encoding Steps (Matrix Size) and number of Slices for 3D, the Operator Defines the scan Time.

For Imaging Techniques With a Defined Contrast (TR), Resolution (Matrix) and Signal -to- Noise, Imaging Time can be optimized by Adjusting Fractional (0.5, 0.75, 1.5) or Multiple NEX (1 to 150)

Adaptive Digital Gating:

The Innovative Adaptive Digital Signal Processing Technique Reduces the Effects of Gradient Activity on the ECG Signal. This Technique Provides Reliable, Consistent –peak Detection and Accurate Synchronization Heart Activity to Acquire Images which Minimize Heart, vascular and CSF Motion.

The Cardiac Signals are Displayed on the LCD Located at the Operator workstation.

The Following Choices are Available for Cardiac Gated Image Acquisition:

  • Multi-Slice Single-Phase
  • Multi-Slice Multi-phase
  • Single-Slice Multi-Phase

The Gating Package Include the Software, One set of patient Lead Wires, and One Fiber optic peripheral Gating Probe

Display and Analysis

Display and Analysis Functions are Accessible From the Standard Operator Workstation and Include: Auto View, Next/Prior Image, Next/Prior Exam/Series Sort, Multiple Image Display, Image Sort, Cine Paging (Interactive, Auto, Manual Mode), Window/Level Save, Cursor (Ellipse/Circle/Box/Trace/Crosshair Manual Draw) Report Cursor, Rulers, Erase Graphics, Measurement Angle/Distance, Reverse /Rotate, Inverse Video, Multi ROI, Screen Save, Accelerator Command Bar, Magnification, Pan/Zoom, Scroll, Image subtraction/Addition, Annotation of Image and Comments, Reformation (Real-Time/Curved), Cross Reference , and Grid.

Image Filtering

The Signa Profile Image Filtering Feature Provides Post Capabilities to Decrease the Apparent Noise Level of Images by Applying an Adaptive Filter to the Image Data. This Feature Utilizes a Hardware Accelerator That Processes Images in Less Than 2 Seconds Per 256 x 256 Image While Allowing Full system Simultaneity.

Filming

  • Page Filming Permits Creation of an Entire Film with a Single Keystroke.
  • Film Formats Available are 1:1 to 20:1 and 35 mm Slides.
  • Multiple Image Formats Allow Filming of Multi Images in a Single Format Frame

Archiving

Archive of Up to 4000 256 x 256 Matrix Images on the Re-Writable Magnetic Optical Disk (MOD), (Dual-Sided 5-1/4 inch Removable platter)

Image Networking

Standard DICOM Store Service Class:

  • Send/Receive DICOM 3.0 Images.
  • Standard DICOM Query/Receive Service Class:
  • User Component: Query and Retrieve Image from DICOM 3.0 Compatible Stations
  • Multiple Exams can be Selected and Moved Between Signa Advantage, CT Advantage and Advantage IC Systems and the Advantage Windows Workstation. The System can Pull images from Advantage Windows, Signa Advantage, CT Advantage and Advantage IC Systems.

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