"Xiaojiu, our unit physical examination this year added a CT program, I heard that this thing will get cancer if you take too many pictures of it? Can you check?"
"I was sick and hospitalized this year, before and after 4 times CT, do so many times is not eaten a lot of radiation?"
"So angry, I once did a CT, the next day to get the film doctor said it was not clear, and then gave me a ...... this is not considered a medical incident"
Many people are "talking about radiation color change How much harm does it do to the human body?
CT is the public familiar with the medical testing equipment, the full name of the English is "Computerized Tomography", the Chinese meaning is "electronic computer tomography". 1967, the British engineer In 1967, British engineer Godfley N Hounsfield invented CT, and in 1972, it was formally used in clinical practice.
CT uses the properties of X-rays to produce different attenuation projections of human tissues or organs, and then uses mathematical principles to reconstruct the projections into images, providing imaging references for doctors' treatments. Currently, CT scans are widely used in clinical settings, such as CT scans of the brain and CT scans of the chest.
CT imaging is like cutting a carrot, consisting of a combination of multiple cross-sections, so it can show the internal center structure of a tissue or organ, and present a more comprehensive picture of the diseased area. Moreover, the high density resolution of CT imaging allows small lesions to be detected in a timely manner, improving the detection rate of disease.
However, because CT exams are radioactive, the public is often concerned about the question: Can CT scans cause cancer?
In fact, this fear is completely unnecessary.
In reality, we don't feel the radiation, but it's everywhere. The sun has radiation, all kinds of building materials have radiation, even the food we eat will have radiation. The data show that even if you don't do any checking in a year, the amount of radiation you receive naturally is about 2.4 mSv. For radiation, as long as it's out of the dose to talk about the danger, it belongs to the unquestionable rogue.
Radiation can cause damage to human DNA, but the dose of radiation from CT is within safe limits and does not pose a danger.
A single CT scan produces a radiation dose of 0.2 mSv, so as long as you don't do it too often, you don't have to worry about the risk of radiation. In contrast, the radiation dose from flying for more than 20 hours can be as high as 0.1 mSv, which is a much higher dose than a CT scan.
However, these radiation values are within safe limits and pose a low risk to the body.
Although you don't have to worry about radiation for a CT scan, there are some necessary precautions.
First, patients should not move during the exam to avoid false imaging that could interfere with observation, and sedatives can be used in conjunction with pediatric patients or patients with agitation. Similarly, metal jewelry worn by the patient can interfere with the results and should be removed during the examination.
Secondly, if you are doing an abdominal exam, you should follow your doctor's instructions and drink water or take 300-500 mL of 1.5-3% iodine solution beforehand; when examining the liver or gallbladder, the patient needs to have an empty stomach; and for pelvic exams, the patient needs to hold their urine.
It is important to note that patients with liver failure, renal failure, and heart failure need to undergo an iodine allergy test before the examination. Children, the elderly and patients with serious conditions, the examination needs to be accompanied by someone, after the examination, the patient can be appropriate to drink more water, eat more vitamin-rich food.
In recent years, PET-CT has become a popular screening program, with higher sensitivity and detection rates than conventional CT, so some people take it as a must-have for cancer prevention, and even do it once a year. In fact, healthy adults have more to gain than to lose with PET-CT.
PET-CT is mainly used for examination or review of patients with diagnosed cancer, and is highly targeted because it knows where the lesions are. In contrast, a healthy person who has the test will not be able to find a clear area, and on the other hand, the probability of false positives or false negatives is higher.
For example, PET-CT may mistake some common inflammation for cancer, and is less sensitive to bladder and prostate cancer, presenting false negative results.
Some leading medical organizations in the United States are opposed to using PET-CT for whole-body screening of the health community, as it not only fails to detect lesions, but also poses a greater negative risk to the body due to the higher dose of radiation.
According to some data, a PET-CT examination is equivalent to 10 years of sun exposure. After the test, due to the presence of radioactivity in the patient's body, it is necessary to isolate the patient from other people for 2 hours before contacting them, especially to avoid premature contact with pregnant women and children.
So, for the healthy public, an annual routine medical checkup program is sufficient, and there is no need for a PET-CT test.
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