A, CR (DR) and CT, the difference between nuclear magnetic:
1, CR and DR shot is the plane irradiated by the radiation, the principle is like taking ordinary photographs. CR is a computer digitization of X-ray imaging information acquisition board storage scanning and then in the display. And DR is a direct analog model is converted to digital signals in the screen display. Can shoot bones.
2, CT shot is a cross-section, the computer will be irradiated from all angles of the plane image combined, is the use of high-speed rotation of the way to shoot, to determine the exact location of the lesion.
3, nuclear magnetic **** vibration and the above equipment does not have any relationship, he is the use of nuclear physics hydrogen atom **** vibration imaging. And the above are the use of radioactive rays imaging.
Nuclear magnetic **** vibration (MRI) is the nuclear physics and the above emission imaging method is very different. Is the use of atoms, in a certain strength of the applied magnetic field, the frequency of its atomic nucleus spin into motion is fixed. It shows the structure of each part of the human body very clearly. It can also show the condition of bones.
Second, why hospitals have DR and CT
1, DR and CT inspection fees are different
2, DR and CT inspection preparation process and targeting is different, the head of the skeleton is generally CT, the rest of the skeleton most of the plane photographed. According to the actual situation of the patient to choose.
3, CT use, maintenance costs are greater than the DR.
Extended information
Nuclear magnetic **** vibration imaging is a new imaging technology, will not have an impact on human health,
But six groups of people are not suitable for nuclear magnetic **** vibration examination that is: installation of cardiac pacemakers, people with or suspected of having intraocular metal foreign body people, aneurysm silver clip ligation surgery people, the body of metal foreign body retention or metal prosthesis people, life-threatening critical patients, claustrophobic patients.
In addition, pregnant women less than 3 months pregnant, it is also best not to do nuclear magnetic **** vibration examination.
CT is an X-ray beam on a certain part of the human body a certain thickness of the level of scanning, by the detector to receive through the level of X-rays, transformed into visible light, by the photoelectric conversion into electrical signals, and then by the analog/digital converter (analog/digital converter) into a digital, into the computer processing.
Baidu Encyclopedia: Nuclear Magnetic **** vibration
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