Upright Multi-Position Weight-Bearing MRI
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Specifications
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THE FONAR UPRIGHT® WEIGHT-BEARING MRI
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Unique Applications
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Rotates patients from recumbent to upright
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Comparative scans in both Upright and Recumbent positions
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Flexion, Extension, Standing, Sitting and Lateral Bending positions
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Scans patients in their position of symptoms
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Ideal for anxious and claustrophobic patients
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The only choice for patients that cannot lie down
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Magnet
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Field Strength
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0.6 Tesla
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Magnet Type
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Iron-frame Electromagnet
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Cooling System Type
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Water (closed-loop); No Cryogens
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Field Orientation
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Horizontal, transverse to the patient
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Configuration
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Front-Open and Top-Open
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Patient Gap Dimensions
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18 inches (46cm) pole-to-pole
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Patient Comfort
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Upright/Sitting patient faces out and can watch a large flat-screen TV with an unobstructed view
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Patient Bed
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Positioning Capabilities
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Translate, Elevate & Angulate
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Rotates patient from recumbent to upright
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Patient Stabilization
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Table tilts backward at 7 degrees to reduce patient motion
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Patient immobilization fixtures
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VersaRest™ trans-polar stabilization bars
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RF Receiver Coil Placement
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RF coils mount easily to movable fixtures
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Patient Weight Limit
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500 lbs.
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Radiofrequency System
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Transmitter Configuration
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Dedicated, Circularly Polarized, Planar
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Receiver Configuration
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Dual-channel
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RF RECEIVER COILS
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Standard Package
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Solenoid/Linear
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High-Performance Spine & Body Wide Belts (45", 55", 65")
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Flexible Cervical
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Signal-Plus Universal Coils
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Solenoid Wrist
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Advanced Coil Package
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Planar
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Quadrature Planar Coil and fixture
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[Note that the Upright MRI is dramatically different than an Open MRI as if utilizes planar (flat) coils to image the spine, just like a high-field MRI]
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Quadrature
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Quadrature Head Coil
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Quadrature T-L (Thoracic-Lumbar) Coil
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Quadrature Knee Coil
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Phased Array
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Shoulder (with Immobilization Fixture)
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Computer System
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Operating System
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Windows 2003 Server
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CPU
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Dual Intel Quad-Core processors
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Memory size, GB
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8.0 GB
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Online Storage
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Three 146 GB disk drives configured in a redundant RAID array with a storage capacity of 290GB
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Array processor
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Not required
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Reconstruction Speed
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< 0.1 sec per 256x256 image
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Storage media
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CD/DVD (5GB)
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Connectivity
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Dicom 3.0 including Store, Print, Query, Retrieve and Modality Worklist
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Console Configuration
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Dual-screen 1280x1024 19-inch LCD flat panel monitors with full screen dedicated to image review
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Gradient System
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Type
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Bi-planar self-shielding
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Maximum Strength (mT/m)
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20
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Slew Rate (T/m/s)
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33
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Minimum Slice Thickness
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2.0 mm (2DFT)
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0.8 mm (3DFT)
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Minimum Field-of-View
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6.0 cm
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Imaging Techniques
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Pulse Sequences
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Spin Echo (SE)
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Multi-echo spin echo (MSE)
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Dual bandwidth Double-echo (DE)
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Fast Spin Echo (FSE)
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Inversion Recovery Spin Echo (IRSE)
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Inversion Recovery FSE (IRFSE): STIR, FLAIR
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Driven Equilibrium FSE (DEFSE)
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Driven Equilibrium IRFSE (DEIRFSE)
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Single-shot FSE (SSFSE)
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Gradient Echo (GRE):
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Fat/Water in phase |
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Fat/Water out-of-phase |
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Multi-echo GRE (Fat/Water in/out/in phase) |
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Gradient Spoiled GRE |
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Steady-State GRE: |
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RF Spoiled GRE, Steady-State Rephased GRE
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MR Angiography:
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2D-TOF and 3-D-TOF |
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Ramped RF |
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Sequence Controls
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Fast Spin Echo
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Driven Equilibrium
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Echo Train Length, Echo Offset, Echo Spacing
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Gradient Echo
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Flip Angle
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Steady-State, RF Spoiling, Rephased
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Magnetization transfer (MT)
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Direction of flow saturation
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Scan orientations
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Multi-Angle Oblique (MAO™), Dual-Axis Oblique
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Preparation Pulses
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Presaturation pulses
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Magnetization transfer (MT)
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Frequency Selective Saturation (e.g. fat, water, silicone)
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Diffusion-Weighted (DWI)
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Trigger/Timing
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Test Bolus
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Breathhold, Fluorscopic
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Reconstruction
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Fast Fourier Transform (DFT): 2DFT, 3DFT
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Partial (Half) Fourier
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ZIP interpolation
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2-point Dixon, 3-point Dixon for Fat Suppression
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Firing Order
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Cross-talk minimization
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Interleaved
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Interleaved by Subscan (e.g. breathhold)
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Sequential
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Data Acquisition
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Rectangular FOV (continuously variable phase sampling ratio)
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Multiple Sub-Scanning
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Centric Phase Encoding
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Flow Compensation, Ramped RF
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Low Bandwidth, Multi-bandwidth
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Continuously Variable Display Matrix
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Swap Frequency and Phase
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Repeat and Replace Slices
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Continuous Scan Mode, Breath-hold Imaging, Kinematic Mode
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Prescan Indicators
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Relative resolution
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Absolute resolution (frequency and phase)
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Post-Processing
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MIP with rotate, tumble, pan
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Image enhancement
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Bright Balance™
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Display and Analysis
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Windowing, ROI, zoom, pan
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Cursors, profiles, derivatives, mean, standard deviation
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Image subtraction
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SNR measurements
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Image Viewing Software (IVS) for referring physiciand to view their patients' scans on a CD
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