One, the principle of different
1, ECT: the introduction of radiopharmaceuticals into the human body, after metabolism in the organs outside the ECT or lesions and normal tissues to form a difference in the concentration of radioactivity between the parts will be detected to these differences, and then imaged through computer processing.
2, CT: X-ray beams 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, enter the computer processing.
Second, the characteristics of different
1, ECT: ECT imaging is a high specificity functional imaging and molecular imaging, in addition to displaying the structure, focusing on the provision of organs and the end of the correct change in the organization of the functional information.
2, CT: with fast scanning time, clear images and other characteristics.
Third, the use of different
1, ECT: mainly used for thyroid cancer, bone and other parts of the examination of tumors, especially commonly used in the detection of bone metastatic tumors, than the ordinary X-ray film can be found in advance of 3-6 months lesions.
2. CT: It is used in medical inspection, industrial inspection and security inspection.
Baidu Encyclopedia-ECT
Baidu Encyclopedia-CT