It is often necessary to visualize the state of various internal organs of the person for medical reasons. In doing so, the doctor usually tries to direct his patient to an MRI device that will provide the highest quality image with high resolution. At the same time, the doctor believes that the greater the magnetic field created by an MRI tomograph, the better. However, this is true only for MRI, which creates a horizontal magnetic field. In modern apparatuses of this type, the horizontal magnetic field is created with the help of superconducting coils, several kilometers of wires which are cooled by liquid helium to almost absolute zero, or rather to 4.20K, or -268.95ºC. Modern MR tomographs with superconducting coils can create a magnetic field of 1-3 Tesla (or T – “Tesla”).
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But both the patient and the doctor should be primarily interested in the quality of the image, with the help of which it will be possible to clarify or even diagnose, evaluate the effectiveness of therapy!
MRI system consists of many magnetic subsystems and related components. For this reason, optimizing only one component will not lead to high image quality. In order to obtain high-quality images, it is very important to carefully determine the consistent characteristics and design of not only the magnet itself as a macro unit, but also of each component of its magnetic subsystem, as well as components such as the gradient characteristic of the magnetic field, from radio-frequency and computer components.
Advantages of the upright MRI
With a magnet located in the upper and lower poles of the gentry, as in an open-type MRI AIRIS Mate, a vertical magnetic field generates a realizable receiving signal along the patient’s body axis. Sensitive areas can be used effectively by wrapping the object to be visualized with a solenoid take-up coil. Conversely, with a traditional horizontal magnetic field, system signals cannot be received along the tap axis. Therefore, traditional systems (with superconductor magnet) use saddle-shaped and similar types of coils as receiving coils. The design of saddle coils, as shown in the figure, covers the object of visualization with two loops, which do not use half of the sensitive area. Experiments have shown that the difference in sensitivity between the two coils is more than 40%, and the imaging time is approximately doubled in the case of horizontal magnetic fields.
Magnetic circuit free of eddy currents
The conductive pole tip behind the magnetic field gradient coil can cause problems such as reduced response and accuracy because the eddy current flows in a direction that suppresses the gradient MRI. AIRIS mate uses a specially designed non-conducting material pole tip, which eliminates these problems.
MRI and claustrophobia
The most common contraindications for MRI are not different metal prostheses, but claustrophobia (fear of confined space). People often don’t know about this phobia until they get inside the CT scanner. So, when using an MRI device such as AIRIS mate, which uses a powerful permanent magnet, there are no restrictions for patients with claustrophobia of any degree of severity and for examination of children. The reason for this is not only the openness of the device compared to MRI devices, which create a MRI with the help of superconducting coils, but also the fact that in the shielded room (see Fig.), where this tomograph is located, there can be a companion next to the patient, with whom it is possible not only visual but also tactile contact.
As of today, about 5000 open HITACHI MRI systems have been put into operation in the world, which in itself speaks volumes. HITACHI is working hard to exceed the expectations of the majority of people for whom high quality imaging is paramount.