OB-OPER0.4 Open Permanent Magnet MRI system

OPER-0.4 Open Permanent Magnet MRI system
Technical Specifications

Magnet
Type: Permanent magnet (NdFeB – Neodymium, Iron & Boron), eddy current free, open C
type or 4-column type with self-temperature control
Field strength: 0.4T±3%
Passive shimming
Field homogeneity: 40×40×38cm sphere ≤40ppm（ Vpp）
40×40×38cmsphere≤5ppm(Vrms)
Vertical gap distance: 400mm±20mm

Gradient system
Gradient amplifier: US imported product
Field strength: 24mT/m effective 40.8mT/m
Slew rate: single axis ≤80mT/m/ms
effective ≤136mT/m/ms
Linearity: 40cm*40cm*38cm ellipsoid<5%
Cooling system: gradient power – wind cooling
Gradient coil – no cooling system required

RF transmitting & receiving system
Type of transmitter & receiver: Digital (US imported product)
Receiving channels: multiple channels
Frequency range: DC-22MHZ
Maximum receiver bandwidth: 1.25MHZ
Pre-amplifier gain max: 30dB
Noise figure: 0.3dB
RF amplifier: ≥6kw (17.00MHz) (US imported product)
RF transmitting coil: panel transmitting coil
RF receiving coil: multiple channel coil

Auto pre-scan function
Auto RF correction
Auto frequency lock
Auto gain adjusting
Auto coil identification
Auto coil tuning
Automatic shimming linear compensation

Image specifications
Image types: T1 weighted image, T2 weighted image, T2﹡ weighted image, proton density
weighted image, diffusion-weighted image, fat suppressed image, water suppressed
image, Magnetic resonance hygrography (MRCP MRM MRU), MRA
Field of view: 40mm-400mm
Acquisition matrix: 64x64-512x512
Graphics matrix max.: 1024x1024
Spatial resolution: 1mm(Head 24cm FOV)、 1.5mm(Body 30cm FOV)
Slice orientation: transverse, sagittal, coronal, free oblique, multi-slice & multi-range
Slice gap: 0-20mm

Pulse sequence
Spin echo (SE)
Multi-slice & Multi-echo (MSME)
Fast Spin Echo (FSE)
Single shot fast spin echo (SSFSE)
Multi shot fast spin echo (MSFSE)
Inversion recovery (IR)
Short inversion tau IR (STIR)
Fluid attenuated IR (FLAIR): T1W, T2W
Inversion recovery fast spin echo (IRFSE)
Gradient echo (GRE): 2D/3D
Steady state process GRE (SSPGRE)
MRA: TOF 2D/3D (MOTSA)
Echo Planar Imaging (EPI)
Line scanning diffusion weighted imaging (LSDI)

Special technologies
Water suppression
Fat suppression
Water imaging (MRCP, MRU, MRM)
Phase encode Optional gradient
Magnetization transfer contrast (MTC)
Flow compensation
Pre-saturation tracking
Over sampling
Partial acquisition
Optimized bandwidth acquisition
Reconstruction of maximum intensity projection (MIP)
Tilt to optimize non-saturated excitation (TONE)
Magnet self-temperature control