| No. |
Item |
Specification |
| 1 |
Magnet System |
|
| 1.1 |
Magnet Type |
Superconductive |
| 1.2 |
Field Strength |
1.5T |
| 1.3 |
Shielding Method |
Active |
| 1.4 |
Shimming Method and Type |
Active +Passive + Dynamic |
| 1.5 |
Magnet stability |
≤0.1ppm/h |
| 1.6 |
Homogeneity (DSV,VRMS) |
|
| 1.6.1 |
45cm |
≤0.832ppm |
| 1.6.2 |
40cm |
≤0.323ppm |
| 1.6.3 |
30cm |
≤0.107ppm |
| 1.6.4 |
20cm |
≤0.041ppm |
| 1.6.5 |
10cm |
≤0.01ppm |
| 1.7 |
Length of magnet(exclude cover) |
157cm |
| 1.8 |
Inner diameter of magnet |
600mm |
| 1.9 |
5 Gauss fringe field(X,Y,Z axis) |
≤2.5mx 2.5mx4.0m |
| 1.1 |
Total capacity of liquid helium (100% liquid helium |
800L |
| full filled ] |
| 1.11 |
Filling liquid helium period |
≥4 Years |
| 1.12 |
Liquid helium"zero"consumption technology |
Yes |
| 2 |
Gradient System |
|
| 2.1 |
Maximum gradient field (single axis,invalid) |
41mT/m |
| 2.2 |
Maximum gradient slew rate(single axis, invalid) |
187mT/m/ms |
| 2.3 |
Minimum gradient rise time |
0.22ms |
| 2.4 |
Maximum gradient field and slew rate reached at |
Yes |
| the same time |
| 2.5 |
Gradient cooling system |
Water cooling |
| 2.6 |
Full digital real-time transmit and receiving |
Yes |
| gradient control system |
| 3 |
RF System |
|
| 3.1 |
Max RF amplifier power |
18kW |
| 3.2 |
Center frequency |
63.87MHz |
| 3.3 |
Real-time digital RF energy monitoring |
Yes |
| 3.4 |
Real-time digital RF short-term accumulation |
Yes |
| monitoring |
| 3.5 |
Real-time digital RF long-term accumulation |
Yes |
| monitoring |
| 3.6 |
Parallel working RF receiver channels |
8/16 |
| 3.7 |
Parallel working RF A/D converters |
8/16 |
| 3.8 |
Each coil unit has corresponding pre-amplifier |
Yes |
| 3.9 |
Parallel acquisition technology platform |
Yes |
| 3.1 |
Maximum bandwidth of each parallel |
≥1.0MHz |
| acquisition receive channels |
| 3.11 |
Transmission bandwidth |
550kHz |
| 3.12 |
Maximum receiver signal resolution |
≥16bit |
| 3.13 |
Fully digital RF system |
Yes |
| 3.14 |
RF receiving amplifier noise level |
≤0.45dB |
| 3.15 |
Multi-channel phased array receiver coil |
|
| 3.15.1 |
Head coil |
Available |
| 3.15.2 |
Neck coil |
Available |
| 3.15.3 |
Body coil |
Available |
| 3.15.4 |
Knee coil |
Available |
| 3.15.5 |
Shoulder coil |
Available |
| 3.15.6 |
Ankle coil |
Available |
| 3.15.7 |
Wrist coil |
Available |
| 3.15.8 |
Breast coil |
Available |
| |
Remark The coil configuration is subject to the |
|
| final contract |
| 4 |
Scan environment |
|
| 4.1 |
Patient table driven mode |
Motor-driven |
| 4.2 |
Position accuracy |
≤0.5mm |
| 4.3 |
Table length |
2400mm |
| 4.4 |
Horizontal movement range |
2055mm |
| 4.5 |
Horizontal motion maximum speed |
≥200mm/s |
| 4.6 |
Patient table lowest height |
675mm |
| 4.7 |
Maximum patient weight |
200kg |
| 4.8 |
Feet-first entry mode |
Yes |
| 4.9 |
Table can be controlled by machine cover in case of |
Yes |
| emergency |
| 4.1 |
Table control system on both side of rack |
Yes |
| 4.11 |
Lighting, ventilation, call system |
Be able to adjust |
| 5 |
Computer system |
|
| 5.1 |
MRI software |
BASDA |
| 5.2 |
System software |
WINDOWS7 |
| 5.3 |
CPU |
≥3.1GHz |
| 5.4 |
Main memory |
≥4GB |
| 5.5 |
Hard disk |
≥500GB |
| 5.6 |
Color LCD monitor |
24" |
| 5.7 |
Monitor resolution |
1920×1200 |
| 5.8 |
External storage |
DVD/USB |
| 5.9 |
DICOM3.0 |
Yes |
| 6 |
Scanning parameter |
|
| 6.1 |
Spin-echo sequence |
Yes |
| 6.1.1 |
SE 2D/3D |
Yes |
| 6.1.2 |
FSE 2D/3D |
Yes |
| 6.1.3 |
FSE sharing |
Yes |
| 6.1.4 |
Single shot FSE |
Yes |
| 6.1.5 |
Spin echo fat-suppression imaging |
Yes |
| 6.1.6 |
Spin echo frequency fat suppression imaging |
Yes |
| 6.1.7 |
Spin echo water suppression imaging |
Yes |
| 6.2 |
GRE 2D/3D |
Yes |
| 6.3 |
DWI |
Yes |
| 6.3.1 |
Max.b value |
10000 |
| 6.4 |
IR sequence |
Yes |
| 6.4.1 |
IR |
Yes |
| 6.4.2 |
FIR(water /fat suppression) |
Yes |
| 6.4.3 |
FLAIR |
Yes |
| 6.4.4 |
STIR |
Yes |
| 6.4.5 |
Water-fat Separation |
Yes |
| 6.5.1 |
Pre-saturation |
Yes |
| 6.6 |
Gating |
Yes |
| 6.7 |
Accelerated sequence |
Yes |
| 6.8 |
Anti-movement scanning technology |
Yes |
| 6.9 |
Min.2D thickness |
0.1mm |
| 6.1 |
Min.3D thickness |
0.05mm |
| 6.11 |
Max.FOV |
50cm |
| 7.6.5 |
Applied direction of parallel acquisition factor |
X,Y,Z |
| 7.7 |
Artifact correction technology |
Yes |
| 7.7.1 |
Fluid compensation |
Yes |
| 7.7.2 |
Respiratory compensation |
Yes |
| 7.7.3 |
Head motion artifact correction |
Yes |
| 7.7.4 |
Elimination of magnetic sensitive artifact |
Yes |
| 7.7.5 |
Eddy current adaptive correction |
Yes |
| 7.7.6 |
Gradient linearity correction |
Yes |
| 7.7.7 |
Multi-echo phase correction |
Yes |
| 7.8 |
Rapid automatic correction technology |
Yes |
| 7.9 |
Automatic frequency tracking technology |
Yes |
| 7.1 |
Automatic coil recognition technology |
Yes |
| 7.11 |
Automatic phase correction technology |
Yes |
| 7.12 |
Echo navigation technology |
Yes |
| 7.13 |
RF balance drive technology |
Yes |
| 7.14 |
RF de-phase technology |
Yes |
| 7.15 |
Gradient de-phase technology |
Yes |
| 7.16 |
Section scanning technology |
Yes |
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