The traditional simple tomography (CT) technique can clearly obtain the anatomical information of the lesion, but the structural features alone have limited limitations. The nature of some lesions, such as benign and malignant tumors, tumor recurrence after surgery, CT It is difficult to make an accurate judgment and cannot accurately reflect the physiological metabolic state of the disease.
The emergence of PET-CT just happens to solve this problem.
PET is called positron emission tomography (PET), which is a imaging device that reflects the genetic, molecular, metabolic and functional status of lesions. It uses positron nuclides to label human metabolites such as glucose as imaging agents, and reflects the metabolic changes through the uptake of imaging agents by the lesions, thereby providing clinical metabolic information for the disease. PET uses positron nuclides as tracers to understand the functional metabolism of the lesions through the uptake of the tracer at the lesion site. It can macroscopically display the pathophysiological characteristics of the organs and metabolism of the whole body, and it is easier to find the lesions. CT can accurately locate the lesion and show the subtle structural changes of the lesion; PET/CT fusion image can fully detect the lesion, accurately locate and judge the benign and malignant lesions, so it can detect the lesion early, quickly, accurately and comprehensively.
PET-CT combines PET and CT on a single instrument to form a complete imaging system called the PET-CT system. The patient undergoes a rapid whole body scan during the examination. Obtaining CT anatomical images and PET functional metabolic images, the two images complement each other, enabling doctors to obtain accurate anatomical positioning while understanding the biological metabolic information, so as to make a comprehensive and accurate judgment of the disease.
It can be said that the emergence of PET-CT has brought medical imaging technology to a new level, enabling non-invasive, dynamic and quantitative evaluation of physiological and biochemical changes in the metabolic activities of living tissues or organs under physiological conditions and diseases. It is possible to obtain information at the molecular level, which is currently impossible with any other method. Therefore, in developed countries, PET-CT is widely used in clinical practice, and has become the most effective means for the diagnosis and treatment of human life diseases, including tumor, coronary heart disease and brain diseases.
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At present, China's PET/CT equipment costs and patient examination costs are the most expensive in medical imaging, and belong to Class A large medical equipment.
Number of equipment requirements
According to the function, PET/CT equipment is divided into clinical research type (referring to PET with 64 rows and above CT) and clinical application type (referring to PET with 64 rows or less CT). The medical institution is equipped with PET/CT (including the supporting medical cyclotron), and the Ministry of Health implements unified planning, unified access and unified supervision. Taking the provincial level as the planning unit, taking into account factors such as population, morbidity, economic and social development level, regional functional positioning, medical service capacity, and social capital to organize the needs of medical institutions, and rationally plan the number of configurations.
In principle, PET/CT is equipped, and areas with an average annual inspection volume of less than 1200 cases may not apply for new configuration.
Agency and staffing requirements
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Conditions to be met by a medical institution applying for PET/CT
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