What is ECT? What is the difference between ECT and PET?

Medicine in the application of computer-aided tomography technology for imaging equipment collectively referred to as ECT, which is an important part of medical imaging technology. ECT's Chinese name for emission computed tomography, is the abbreviation of its English name into PET, that is, PECT, is another type of ECT equipment, is to emit positron radionuclides as the imaging agent, known as positron emission computed tomography, its English name is positron emission computed tomography, that is, we usually say PET. PET is the most advanced imaging equipment in the field of nuclear medicine, which is regarded as an epoch-making milestone in the history of nuclear medicine, and is the symbol of the highest level of nuclear medicine.PET uses imaging agents such as F-18-FDG, C-11, N-13, O-15 and so on, N-13, O-15, etc. are the basic elements of human tissues, which are easy to be labeled to various compounds, metabolites or analogues necessary for life without changing their biological activities and can participate in the physiological and biochemical metabolic processes of the human body, and thus can reflect the physiological and biochemical processes of the human body at the in-depth molecular level, and evaluate the functional status of the human body from the front of function and metabolism to achieve early diagnosis of diseases, The purpose is to achieve early diagnosis of diseases, tumor staging, therapeutic efficacy judgment, prognosis assessment and so on.