The full-body structure of a medical MRI scanner is divided into five interconnected modules: the core magnet system, the patient table system, the gradient and RF system, the control system, and the auxiliary support system. These modules are built around a strong static magnetic field and are designed for scanning all body regions.
Core magnet system
1.1 Static magnet unit
The core is a low-temperature superconducting magnet, commonly 1.5T or 3.0T. It uses liquid helium to maintain an ultra-low temperature of 4.2K and generates a uniform static magnetic field, with homogeneity in the ppm range.
Ferromagnetic or active magnetic shielding layers reduce fringe field interference with the surrounding environment.
1.2 Support and insulation structure
This structure provides rigid support for the superconducting coils. A high-vacuum insulation layer reduces liquid helium cooling loss.
Patient table system
2.1 Table components
The table uses carbon fiber composite material. It is non-magnetic, has a load capacity of at least 150 kg, and has an insulating and smooth surface.
It moves along the magnet axis with positioning accuracy of ±0.1 mm, which supports different patient positions.
2.2 Drive unit
A linear motor drives the table. There is no gear transmission, which prevents magnetic interference and allows smooth, fast position adjustment.
For non-magnetic table components, gradient coil mounts, RF coil housings, and non-magnetic window frames, Hansheng Automation can machine custom parts to customer drawings in single units or small batches.
Gradient and RF system
3.1 Gradient coil unit
X, Y, and Z gradient coils provide spatial encoding.
Gradient power amplifiers switch current at the millisecond level. Water cooling is required to prevent temperature rise from affecting magnetic field accuracy.
3.2 RF system
Transmit coils send RF pulses at the Larmor frequency to excite hydrogen proton resonance.
Receive coils use dedicated phased array or quadrature coils for the head, chest, and abdomen to capture weak resonance signals.
Control system
4.1 Hardware modules
Main control cabinet: integrates the signal processor and coordinates the timing of all systems.
Dedicated power supply: isolation transformer plus UPS to prevent grid fluctuations from disturbing magnetic field stability.
Cooling system: liquid helium refrigerator to maintain the superconducting state, and a gradient coil water chiller.
4.2 Software modules
Imaging sequence software: custom T1, T2, diffusion, and other whole-body scan sequences.
Data reconstruction software: converts raw signals into tomographic images.
Auxiliary support system
5.1 Safety and shielding
Magnet room: walls and ceiling use ferromagnetic or copper mesh for electromagnetic shielding to prevent external magnetic and RF leakage.
Interlock system: door magnetic interlock and magnet quench protection, including a helium exhaust pipe for emergency quench.
5.2 Ancillary components
Non-magnetic patient monitor and intercom communication device.
Observation window in the scan room, made of non-magnetic material.
Beyond MRI scanner components, Hansheng Automation also provides custom machining for respiratory equipment, compressor assemblies, food processing machinery, filling machinery, printing equipment, tobacco packaging machinery, yacht hardware, and RC car components. We work from customer drawings and deliver single units or small batches. The service remains focused on precision parts manufacturing, not complete equipment sales.
