VESSEL DESIGN FOR SUPERCONDUCTING MAGNETIC RESONANCE IMAGING (MRI) SYSTEM
Publication Date: 2016-Dec-01
The IP.com Prior Art Database
A vessel design for a magnetic resonance imaging (MRI) system is proposed. According to the proposed vessel design vessel, the vessel includes an inner cylinder, an end flange and an outer cylinder. The farthest point A in axial direction is located between the minimum diameter of inner cylinder and the maximum diameter of outer cylinder in radial direction.
The present disclosure relates generally to magnetic resonance imaging (MRI) system and more particularly to a vessel design for an MRI system.
Generally, a superconducting magnetic resonance imaging (MRI) magnet comprises a vacuum vessel, a thermal shield and a helium vessel. Each of the vacuum vessel and the helium vessel comprises an outer cylinder, an inner cylinder, and two end cups or end flanges. The end cups are annular, and at least part metallic. As shown in Figure 1, the end flange may be flat or curved. Further, to achieve the mechanical performance, for example strength for vibration resonance, and under pressure, the end flanges are required to have minimal specified thickness. Curved end flanges have better performance than flat end flanges.
One conventional technique uses an arrangement of recesses or protrusions to reduce mechanical resonance and allow the use of thinner material for the end caps, the inner cylinder or the outer cylinder of vacuum vessel and thermal shield. Another conventional technique includes a composite sealed vessel. The vessel includes a non-metallic, generally cylindrical outer containment piece disposed around the inner containment piece. A pair of non-metallic flanges is disposed at ends of the inner and outer containment pieces to form a closed structure defining a cavity therein. The vessel also includes a metallic external lining disposed over the closed structure to form a leak-tight pressure boundary. Yet another conventional technique includes the end flange of the vacuum vessel having an outer surface, an inner surface and a core sandwiched between the outer and inner surfaces. The core has greater stiffness than the outer surface and the inner surface. However, the conventional techniques to improve mechanical performance provide end flanges and vessels with complex structures and manufacturing processes.
It would be desirable to have an MRI system vessel design that provides improved mechanical performance using lesser material.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts a conventional solid-body x-ray image detector with circular detector surface area.
Figure 2 de...