According to the different absorption and transmission rates of X-rays in different tissues of the human body, the application of highly sensitive instruments to measure the human body, and then the data obtained from the measurements are inputted into an electronic computer, which processes the data and takes a cross-section or three-dimensional image of the body part to be examined. The computer processes the data and then takes a cross-section or three-dimensional image of the part of the human body being examined, discovering small lesions in any part of the body.
magnetic resonance, magnetic **** vibration (medical examination of a large-scale equipment)
Computed tomography (CT) can be in a cross-section of the anatomical plane, accurately detecting a variety of different tissues between the density of the small differences, is the observation of bone and joints and soft tissue lesions of a more ideal way of examination. In the diagnosis of arthritis, it is mainly used to examine the spine, especially the sacroiliac joints.CT is superior to conventional X-rays because of its high resolution and its ability to perform axial imaging. Because of the high density resolution of CT, soft tissues, bones and joints all appear clear. In addition, CT can do axial scanning, some of the traditional X-ray images on the more difficult to distinguish between the joints can be CT images on the "original shape". For example, due to the sacroiliac joint joint surface is born tilted and curved, while there are other tissues of the overlap, although most cases of sacroiliac joints with x-ray film may have been able to meet the requirements, but sometimes X-ray examination found sacroiliac arthritis is more difficult to patients with problems can be done on the CT examination.
Magnetic *** vibration imaging (MRI) is based on the interaction of radioactive waves and hydrogen nuclei in a strong magnetic field. Once introduced, MRI quickly became a useful imaging tool in the diagnosis of many diseases, including the musculoskeletal system. The musculoskeletal system is best suited for MAGNETIC***VIBRATION imaging because of its wide range of tissue density contrast. In the diagnosis of bone, joint and soft tissue lesions, magnetic **** vibration imaging has several times more imaging parameters than CT and a high degree of soft tissue resolution, so that its soft tissue contrast is significantly higher than that of CT. magnetic **** vibration imaging through its multidirectional planar imaging function, the application of high-resolution toxic surface coils can significantly improve the quality of the imaging of the joints, so that the nerves, tendons, ligaments, blood vessels, cartilage, etc. can not be resolved by other imaging. The subtle results that cannot be distinguished by other imaging examinations can be displayed. The shortcomings of magnetic **** vibration imaging in the bone and joint system are that there is no specificity for the qualitative diagnosis of bone and soft tissue lesions, and the imaging speed is slow during the examination. The patient's voluntary or involuntary activities can cause motion artifacts, affecting the diagnosis.
X-ray film, CT, magnetic **** vibration imaging can be called the troika, the three organic combination, so that the current imaging both expand the scope of the examination, but also improve the level of diagnosis.