What is the MRI index and what does MRI mean

MRI index (MRI) (Magnetic Resonance Imaging) nuclear magnetic resonance imaging index.

Chinese name Magnetic Resonance Imaging (MRI).

English name Introduction to laboratory MRI is a new type of high-tech imaging examination method in recent years, and it is a new medical imaging diagnosis technology that was only applied to clinical practice in the early 80s. It has no ionizing radiation (radiation) damage; no bony artifacts; Multi-directional (transection, coronal, sagittal section, etc.) and multi-parameter imaging; High degree of soft tissue resolution; Unique advantages such as vascular structure can be visualized without the use of contrast media.

Clinical significance Indications:

Neurological lesions, including tumors, infarctions, hemorrhage, degeneration, congenital malformations, infections, etc., have almost become the means of diagnosis. In particular, spinal cord and vertebral lesions, such as tumors, atrophy, degeneration, and traumatic disc lesions of the spine, have become the preferred examination methods.

Lesions of the large blood vessels of the heart; Lesions of the mediastinal diaphragm in the lungs.

examination of the abdomen and pelvic organs; The biliary system and urinary system are significantly better than CT.

soft tissue lesions on joints; It is very sensitive to aseptic necrosis of bone marrow and bone, and lesions are detected earlier than X-ray and CT.

Normal value is normal.

CPI is the abbreviation of Consumer Price Index. The Household Consumption Index is a macroeconomic indicator that reflects the changes in the level of consumer goods and services purchased by households. It is a relative number that measures the change of the **level of a group of representative consumer goods and services over time, and is used to reflect the change of the **level of consumer goods and services purchased by households.

Many people use the CPI index to refer to the inflation rate. There are some differences between the two, but they can basically be used interchangeably.

Magnetic resonance imaging

Moderate renal insufficiency

MRI is also known as Magnetic Resonance Imaging.

Magnetic resonance. Mainly soft tissues are photographed.

Categories: Education Science >> foreign language learning.

Problem description: What is MRI?

Analysis: MRI is also called nuclear magnetic resonance, MRI diagnosis is widely used in clinical practice, and is becoming more and more perfect, although the time is short, it has also shown its superiority.

MRI was the earliest and mature application in the nervous system. It can show not only gray matter, white matter, but also some nerve nuclei, and even cranial nerves, optic nerves, and conduction tracts. Three-dimensional imaging and vaculate effect can not only accurately locate the lesion, but also understand the relationship between the lesion and the blood vessels, and provide a diagnostic basis for the qualitative diagnosis of the lesion.

MRI is specific and superior to CT in the diagnosis of intracranial primary tumors and metastases, intracranial infection, intracerebral hemorrhage, cerebral infarction, hydrocephalus, cerebrovascular malformations, spinal cord and spinal diseases. It is specific for traumatic brain injury and can detect small hematomas that are easily missed by CT. It is currently widely used in the nervous system.

The mediastinum can be observed on MRI image, and the septal tumor and its anatomical relationship with the surrounding blood vessels can be observed, and the invasion of the armpit, brachial plexus, and spinal canal can be clearly visualized. It is of great help in the diagnosis of hilar lymphadenopathy and central lung cancer. Cardiac large vessel MRI has the advantages of rapid, time-saving and less patient pain, which can show the size and lumen of the atrioventricular and blood vessels, and can observe hemodynamic changes, which is conducive to functional diagnosis and can also identify abnormal tissues.

MRI is also diagnostic of the abdomen and pelvis, neck and breast. For the display of early malignant tumors, the invasion of blood vessels and the staging of tumors are better than those for showing bone marrow fat, and can be clearly displayed for lesions that invade bone marrow, especially for the diagnosis of osteomyelitis, the sensitivity, specificity and accuracy are better than those of other imaging examinations, and the sensitivity and accuracy of early ischemic osteonecrosis are also higher. It also has advantages in showing intra-articular lesions and compared tissues.

MRI is limited in showing bone and gastrointestinal tract.

MRI is an abbreviation for Magnetic Resonance Imaging, Magnetic Resonance Imaging System. Nuclear magnetic resonance (NMR) is a physical phenomenon that was widely used as an analytical method in the fields of physics, chemistry and biology, and it was not until 1973 that it was used for medical clinical testing. To avoid confusion with radiological imaging in nuclear medicine, it is referred to as magnetic resonance imaging (MR).

MR is a kind of biomagnetic spin imaging technology, which uses the characteristics of the spin motion of the atomic nucleus, in the applied magnetic field, after being excited by radio frequency pulses, to generate a signal, detect it with a detector and input it into a computer, and display the image on the screen after processing and conversion.

Magnetic resonance imaging technology is an important equipment for hospitals to diagnose systemic diseases of the human body.

MRI is magnetic resonance imaging, the principle is to apply a magnetic field, so that the nucleus and the beat of the magnetic field (resonance), when the magnetic field stops, the nucleus returns to normal, this recovery process will release energy in the form of electromagnetic waves, the probe detects this energy, and is used for imaging.

Magnetic resonance imaging (MRI) systems provide clear images of human tissue, and the system detects and processes the signals generated by hydrogen atoms excited by excitation pulses from a resonant magnetic field in a strong magnetic field.

The spin motion of the hydrogen nucleus determines its own intrinsic magnetic moment, and under the action of a strong magnetic field, these hydrogen atoms will be oriented and telepathically aligned. For simplicity, the hydrogen nucleus in a static magnetic field can be thought of as a taut rope. The nucleus has a resonance frequency or "larmor" frequency, depending on the strength of the local magnetic field.

It is like a rope that resonates under external tension. In a typical gliding MRI magnetic field, the resonant frequency of the hydrogen atom is approximately 64MHz.

Appropriate magnetic resonance excitation or RF pulse excitation (frequency equal to the resonant frequency of the hydrogen nucleus) can force the nuclear magnetic moment to partially or fully offset to a plane perpendicular to the magnetic field of the high-pin action. When the RF excitation is stopped, the nuclear magnetic moment returns to the condition of the static magnetic field. The nuclei release energy during the realignment, emitting an RF signal at a resonant frequency (depending on the field strength), which is detected and imaged by an MRI imaging system.