The radiation of petct mainly comes from the imaging agent injected before scanning, which is commonly used in clinic 18F-FDG. The radiation dose of this imaging agent is very low, and the half-life of 18F-FDG is very short, which can disappear in a short time.
About 24 hours after the examinee completes the petct examination, the components of the imaging agent in the body can basically be sold on a commission basis, and the imaging agent can be excreted through urine, which is also the main reason why the doctor will let the examinee drink more water.
PET-CT perfectly combines pet and CT. PET provides detailed molecular information, such as the function and metabolism of the lesion, while CT provides the precise anatomical location of the lesion. One imaging can obtain all the sectional images of the whole body, which is sensitive, accurate, specific and accurate, and can understand the overall situation of the whole body at a glance, so as to achieve the purpose of early detection of lesions and diagnosis of diseases.
The appearance of PET-CT is another revolution in medical imaging, which has been recognized and widely concerned by the medical community and can be called "the crown of modern medical high technology".
PET-CT is the perfect integration of the most advanced PET scanner and advanced spiral CT equipment, which is mainly used for early detection and diagnosis of major diseases in tumor, brain, heart and other fields.
Expand data advantages
1, morning
PET-CT can diagnose tumors and other diseases at an early stage. Because of the active metabolism of tumor cells, the ability to take up imaging agent is 2- 10 times that of normal cells, and obvious "light spots" are formed on the image, so hidden tiny lesions (more than 5mm) can be found before the early anatomical structure of the tumor changes.
2. Safety
Check for safety and non-invasiveness. Most of the nuclides used in the examination are basic elements or very similar nuclides that constitute human life, with a short half-life. The dose received is slightly higher than that of chest CT scan, which is safe, efficient and repeatable in a short time.
3, accurate
The test results are more accurate. Qualitative and quantitative analysis can provide valuable functional and metabolic information, and provide accurate anatomical information, which is helpful to determine and find the exact location of the tumor. The examination results are more accurate than simple PET or CT, especially improving the diagnostic ability of small lesions.
Step 4 be quick
Perform a quick general examination. Other imaging examinations scan selected parts of the body, while PET-CT scans the whole body (neck, chest, abdomen and pelvic cavity) in about 20 minutes, and can obtain cross-sectional, sagittal and coronal images of PET, CT and their fusion respectively, and can directly see the affected parts and conditions of the whole body lesions.
5, high cost performance
Tumors can be found early and their properties can be determined. It was found that the late treatment cost decreased by 1-5 times, and the survival time increased by 1-5 times or even 10 times. One examination can accurately judge whether most tumors are benign or malignant and whether they have metastasis, and avoid delaying disease diagnosis or making wrong treatment plans after multiple examinations.
Can accurately stage the tumor, evaluate the therapeutic effect, and reduce unnecessary treatment methods and doses; It can accurately judge the tumor recurrence after tumor treatment. Although the cost of a single examination is slightly higher, it actually avoids unnecessary surgery, radiotherapy and chemotherapy and hospitalization, and the overall cost performance is outstanding.
Reference-Baidu encyclopedia PET-CT