Every adult has at least once encountered such a medical manipulation as hardware diagnostics.. This may be an ultrasound or x-ray, an annual x-ray or an ECG.. However, not everyone has an idea about tomographic methods of remote scanning - CT and MRI.. This is due to the relative high cost of these procedures, the availability of which is increasing every year..

How tomographic scanning methods work? Screenings carried out on hardware devices - tomographs, are carried out according to a single plan: the patient is placed inside the machine, remains motionless throughout the process, the scanner takes a layer-by-layer survey of the area under study and transfers the images to a computer monitor. Images are obtained in black and white with more than 500 shades of gray, which are differentiated by the equipment and recognized as pathological foci.

Despite superficial similarities, these types of surveys differ significantly.. CT and MRI have different operating principles. So, computer screening uses ionizing radiation, identical to the X-ray machine.. Biological structures “shine through”, dense, cavity or liquid objects are seen on scans more clearly than soft tissue formations. Therefore, computer screening is more often used to examine skeletal structures, dynamic hollow organs (heart, lungs), vasculature, and abnormal neoplasms..

An MR examination does not involve the use of X-rays, as it is based on capturing signals from the molecular structures of biological cells. When the patient is placed inside the tomograph, his body enters a high-frequency magnetic field.. Cell atoms enter into dissonance with the external field of the device, emit certain signals, which are fixed by the equipment. This is the main difference between CT and MRI.. Since the structure of soft tissues is more “free” in comparison with dense formations and systems, the internal resonance from them is higher.. On the pictures of the MRI scanner, soft tissue organs, brain structures, nerve channels, muscle and tendon fibers, cartilage, etc..

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