What Is an Open MRI?

Magnetic resonance examination (Magnetic Resonance, MR) is a method of medical examination and a revolution in medical imaging. Biological tissues can be penetrated by short-wave components such as X-rays in the electromagnetic spectrum, but can block medium-wave components. Such as ultraviolet, infrared and long wave.

Magnetic resonance examination

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Magnetic resonance examination (Magnetic Resonance, MR) is a method of medical examination and a revolution in medical imaging. Biological tissues can be penetrated by short-wave components such as X-rays in the electromagnetic spectrum, but can block medium-wave components. Such as ultraviolet, infrared and long wave.

Human tissue allows long wave components such as radio waves generated by magnetic resonance to pass through, which is one of the basic conditions for clinical application of magnetic resonance.

Chinese name

The spin motion of the nucleus is the basis of magnetic resonance imaging, and the hydrogen atom is the most abundant substance in the human body. Under normal circumstances, the hydrogen atomic nucleus in the human body is in a state of irregular precession. When the human body enters into a powerful and uniform magnet space, Under the influence of the static magnetic field, the original chaotic hydrogen nuclei are aligned in the direction of the external magnetic field and continue to move forward. When the external magnetic force is stopped immediately, the hydrogen atoms in the human body will return to the original state at the same time and the same tissue; this is called relaxation. [RELAXATION] and

Magnetic resonance examination has the advantages of safety, non-radiation, accuracy and so on. Ensure that the following points can be performed for magnetic resonance examination:

1. People who have magnets in their body, such as pacemakers, artificial valves, and metal foreign bodies next to important organs, cannot do this test, but those who have been implanted by the surgeon as non-magnetic objects Have a magnetic resonance examination.

2. To explain to the technician the following: whether there is a history of surgery; whether there is any metal or magnetic substance implanted in the body including metal

Central Nervous System

Cerebral vascular disease

Brain tumor

3. Spinal cord lesions

4. Intracranial infection

5. Degenerative changes in the brain

6. Craniocerebral congenital malformations

7. Craniocerebral trauma

At the end of 1978, the first magnetic resonance system was born in a cabin at the Siemens Research Base in Erlangen, Germany. At the end of 1979, when the system finally worked, its first "work" was an image of a pepper. The first image of the human brain was acquired in March 1980, at which time the data was collected in 8 minutes. In 1983, Siemens successfully installed the first clinical magnetic resonance imaging equipment at the Medical College of Hanover, Germany. With this oil-cooled, magnetic field strength 0.2 Tesla magnetic resonance device, Professor Heinz Hundeshagen and his colleagues performed imaging diagnostics on more than 800 patients. At that time, it took an hour and a half to complete an inspection. In the same year, the first superconducting magnet was successfully installed at the Mallinckrodt College in St. Louis, USA.

The advent of superconducting magnet technology has greatly improved image quality while speeding up image generation and simplifying installation. However, the first superconducting magnet weighed 8 tons and was 2.55 meters long. At the time of delivery, there are 12 cabinets filled with electronics along with the magnets to control the system and reconstruct the collected data into images. Today, the field strength of 1.5 Tesla's Siemens MagnetomSonata or MagnetomSymphony magnetic resonance system is only

There are 3 computer cabinets, covering an area of only 30 square meters.

The advent of the MagnetomOpen product in 1993 marked Siemens as the world's first manufacturer capable of producing an open magnetic resonance imaging system, enabling patients with autism to also benefit from magnetic resonance technology. In 1999, Siemens introduced the MagnetomHarmony and Symphony systems, which can automatically advance the bed, bringing new breakthroughs in magnetic resonance technology. From then on, comprehensive examinations of large human organs / sites (such as the spine) no longer require repositioning of the patient.

Today, with the help of functional magnetic resonance imaging (fMRI) technology, the BOLD (Blood Oxygen Dependence Level) effect can be used to obtain information about the tissue structure and function of different regions of the human brain, which enables neurologists

Magnetic resonance picture

, Psychologists, and neurosurgeons can gain insights into brain function and even metabolic processes. In addition, because magnetic resonance images can show the degree to which healthy tissues of the human brain have replaced the functions of degraded brain tissues, stroke patients have obtained new rehabilitation therapies. For ultra-high field strength magnetic resonance applications, Siemens has introduced two field strength 3 Tesla scanning devices-the MagnetomTrio system for head-to-toe full-body examinations of patients and the MagnetomAllegra system for human brain examinations. This further enhances the advantages of magnetic resonance imaging technology, especially in the field of surgical imaging. For example, during surgery, magnetic resonance imaging can accurately map brain tumors. In this way, the doctor can completely remove the tumor during the procedure. In the application of cardiac diagnosis and treatment, magnetic resonance imaging technology opens up a new way-using the so-called auto-gated cardiovascular magnetic resonance (CMR) technology, extracting periodic signals from image data to replace the ECG signal to connect the image data with the heart The movement is synchronized, and there is no need to run cables and electrodes on the patient.

The continuous development of magnetic resonance imaging technology has opened up new application fields. For example, a "virtual endoscope" in the human intestine can detect even small polyps. The timely removal of these polyps can greatly reduce the risk of bowel cancer. Another application of magnetic resonance imaging is the diagnosis of special tumors, such as: magnetic resonance-guided biopsy for X-ray fluoroscopy of early chest tumors and tumor staging for prostate lesions.