Upright Multi-Position Weight-Bearing MRI

 

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