360-degree-open magnet for permanent magnet type medical magnetic resonance imaging system

Abstract

The invention discloses a 360-degree-open magnet for a permanent magnet type medical magnetic resonance imaging system. The magnet comprises a rectangular main frame, as well as two magnetic poles which are relatively mounted on the main frame up and down, wherein the main frame comprises an upper part cross yoke, a lower part cross yoke, and vertical yokes on the left side and the right side; an upper iron pier is fixed in the middle of the bottom surface of the upper part cross yoke; a lower iron pier is fixed in the middle of the top surface of the lower part cross yoke; and the main magnetic poles are respectively fixed with the upper iron pier and the lower iron pier; a reinforcing rib is arranged on the top surface of the upper part cross yoke; and the distance between the two vertical yokes is larger than the maximum size of the main magnetic poles on the horizontal direction by two times. According to the invention, a larger frame type magnetic circuit design scheme is adopted, the space surrounding the magnetic poles is larger enough, a patient to be examined can be moved vertically and horizontally and rotated at 360 degrees when a sickbed and bed boards are in combination motion between the upper and the lower magnetic poles, so that a doctor can approach the magnetic poles in any direction to heal the patient conveniently between the upper and the lower magnetic poles.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to an open magnet structure of a permanent magnet type medical magnetic resonance imaging system. Background technique [0002] In 1946, Purcell of Harvard University and Bloch of Stanford University independently discovered the phenomenon of nuclear magnetic resonance. They won the 1952 Nobel Prize in Physics for their achievements in physics and chemistry. With the continuous development of people's research on the application of magnetic resonance, a commercial machine for human body imaging was finally successfully launched in the early 1980s, providing an advanced technical means for human body medical diagnosis. [0003] Medical magnetic resonance imaging system is mainly composed of magnet system, spectrometer system, gradient system, radio frequency transmitting and receiving system, computer system (including interface, application software, scanning sequence), ...

AI Technical Summary

Problems solved by technology

But obviously, the distance between the main magnetic pole and the vertical yoke in this structure cannot be very large, and it cannot provide enough space for the doctor to treat the patient. If the distance between the main magnetic pole and the vertical yoke is increased , it will inevitably increase the deformation of the upper transverse yoke, especially the part where the main magnetic pole is suspended in the middle of the transverse yoke will produce obvious deformation and vibration, and the middle part of the transverse yoke will remove material, further weakening the transverse yoke The stiffness of the magnet cannot guarantee the stability of the

Therefore, this structure is only suitable for systems with a small lateral span of the magnet, and cannot provide space for treating patients

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