Positron Emission Computed Tomography (PETCT or PET/CT) is an advanced clinical imaging technique in the field of nuclear medicine.
Positron Emission Computed Tomography (PETCT) is a relatively advanced clinical imaging technique in the field of nuclear medicine. The general method is to label a certain substance, which is generally necessary in the metabolism of biological life, such as glucose, protein, nucleic acid, fatty acid, with short-lived radionuclides (such as 18F, 11C, etc.), and inject it into the human body, so that the aggregation of the substance in metabolism reflects the situation of the metabolism of life, and thus achieves the diagnostic purpose.
Expanded:
Positron emission tomography PET has been widely used in the diagnosis and differential diagnosis of a variety of diseases, the judgment of the condition, the evaluation of therapeutic efficacy, the study of organ function and the development of new drugs.
1, high sensitivity, PET is a reflection of the molecular metabolism of the image, when the disease is in the early stage of molecular level changes in the morphology and structure of the lesion area has not yet presented abnormalities, MRI, CT examination can not be a clear diagnosis, PET examination can be found in the lesion, and can be obtained from the three-dimensional image, but also quantitative analysis, to achieve an early diagnosis, which is the current other imaging examination of the The PET test can also be used for quantitative analysis to achieve early diagnosis, which is incomparable to other current imaging tests.
2. High specificity: It is difficult to judge whether a tumor is benign or malignant when it is detected by MRI or CT, but PET can diagnose malignant tumors according to their high metabolic characteristics.
3. Whole-body imaging: PET is a one-time whole-body imaging test that can obtain images of all areas of the body.
4. Good safety: The nuclides needed for PET examination are radioactive to a certain extent, but the amount of nuclides used is very small, and the half-life is very short (the short one is about 12 minutes, and the long one is about 120 minutes), and after physical attenuation and biological metabolism, the time of retention in the body of the examined person is very short. The radiation exposure dose of a PET whole body examination is much smaller than that of a conventional CT examination of a part of the body, and is therefore safe and reliable.
Baidu Encyclopedia - PET CT
Baidu Encyclopedia - Positron Emission Tomography