Computer and magnetic resonance imaging. Comparison

General diagnostics
Computer and magnetic resonance imaging. Comparison.

Few people understand that CT and MRI are so different procedures that it is even difficult to unite them on some basis. Except, of course, the use of the principle of tomography - layer-by-layer investigation and in the subsequent image of the object. To clarify the confusion for yourself, look at the table. It will not only help you navigate the general questions concerning these studies, it will lead to the idea of ​​having to do one of them, but also, perhaps, will warn against their unjustified conduct.

Symptom CT scan Magnetic resonance imaging
Physical basis

At the heart of CT is the ability of any tissue to absorb X-rays. Because Different parts of the scanned object have different absorptive capacity, this can be displayed using a picture. Moreover, the more information is removed from more points, the more objective it is

.

MRI has nothing to do with X-rays. Under the influence of an external magnetic field, the protons of hydrogen atoms (and they are everywhere) are oriented along its lines of force and absorb the energy of a given field. When returning to the initial energy level, the energy released by them is recorded. As a result of translating its values ​​into digital form, a layered image is obtained.

Procedure of the study

Studies are very similar. In both cases, the patient lies on the couch moving in the "pipe". Due to the fact that you are moving along the scanner, and you get a layered image. The timing of the procedure is radically different. When CT scan of one area of ​​the body takes a few minutes

Scanning one area takes about 40 minutes.

The cost of equipment (and, accordingly, and research) Relatively low Extremely high. The higher the intensity of the magnetic field created, the more expensive the apparatus (the better the quality of the images).
Advantages over other method. 1.Procedure continues much less.
2. It is much cheaper.
3. There are no special conditions for installing the equipment.
3. Ability to diagnose bone structures, stones, etc.

1.Informativnee when researching many areas (primarily the brain) - this is the main advantage.
2. Possible MRI in pregnant women
3. Absence of radiation load.
4. There is a natural contrast from the blood flow, accordingly there is no need for additional contrasting for its study
5. No interference from bone tissue, respectively, less chance of diagnostic errors
6. There is the possibility of conducting magnetic resonance spectroscopy for the study of tissue metabolism.

Contraindications 1. Claustrophobia
2. Pregnancy

Absolute (carrying an MRI threatens life):
1. the patient has a pacemaker working on demand (changes in the magnetic field can simulate a heart rhythm).
2. The nature of electronic implants of the inner ear.
3. the presence of clipped blood vessels in the central nervous system (clips under the influence of the field can slip, that is, intracerebral hemorrhage will open)
Relative:
1. Coma or other conditions in which life support devices are needed (artificial ventilation, for example)
2. Children's age.
3. Violations of consciousness.
4. Claustrophobia.

General indications

1. The investigation of the spine.
2. Skoropomoschnye research goal. Brain (trauma and stroke).
3. Investigations of the thoracic cavity organs.
4. Diagnosis of the pathology of the organs of the retroperitoneal space (kidneys, adrenal glands).
5. Investigation of ENT - organs (paranasal sinuses, temporal bones, larynx).

1. Investigation of the brain and spinal cord.
2. Study of mediastinal organs (esophagus, aorta, hollow veins, trachea).
3. Research of pelvic organs (bladder, uterus, appendages, prostate, seminal vesicles).

It should be noted that the rostrum in the diagnosis of joints and bones is retained by X-rays, and in studies of the neck organs - ultrasound. So each organ has its own method of diagnosis.
Finally, I would like to wish that your knowledge obtained as a result of reading this article will never be of use to you. Do not be ill!!!!!!!!