CT check cannot be done casually

After suffering from the influenza A (referred to as A flow), many people have a long cough for a long time.Is it necessary to do a CT check?What are the cases of CT check?

CT is also a X -ray examination

The full name of CT is an electronic computer fault scan, which is a digital radiation diagnostic device, which has become quite popular in my country.

When CT scanning, the patient was sent to the frame, X -ray ball pipes and detectors were sent around the patient’s rotation scanning data.At this time, X -rays were accepted by the patient’s body and attenuated rays, and then transformed into electrical signals, digital signals, etc. to the computer, and finally realized the reconstruction body image after processing.CT image examination can help doctors diagnose the condition.

Under what circumstances need to check CT

For the vast majority of people, the flow of A is just an upper respiratory tract infection. At this time, there is no need to do a CT examination.However, if the course of the disease is more than 1 week, there are repeated cough, high fever or continuous low fever, even shortness of breath, breath, or obvious breathing difficulties, you should go to the hospital for treatment in time. If necessary, CT examination should be evaluated.In particular, the elderly who are indifferent, poor appetite, fatigue or sluggish, and people with basic diseases must be more vigilant.

Do not advocate non -necessary CT examination

The X -ray used during CT check is a single, hard high -energy ray. It and conventional X -ray photography belong to X -ray image diagnosis.The radiation dose suffered from the patient in the X -ray examination program depends on the type of the device, the type of the examination program, the patient’s body type, the check site, and the exposure parameters.CT scanning conditions are high, and the exposure conditions of conventional X -ray photography are very different. The total radiation volume during CT scanning is much larger than conventional X -ray photography, resulting in relatively high radiation doses accepted by patients.

The effective dose of one -chest testing is 0.02 ~ 0.1MSV (the effective dose unit of X -ray, usually writing MSV), and the effective dose of one chest CT examination is 6 ~ 8msv, which is dozens of to dozens of chest films to check.Hundreds of times.Low -dose chest CT scan can significantly reduce the dose, and the effective dose is about 1.5msv, but it is also significantly greater than the chest inspection.

X -rays can produce two basic types of biological effects on the human body: certainty effects (tissue reactions) and random effects.The determination effect is a radiation effect caused by cellular damage. Generally, there is a dose threshold, that is, the effect will not occur when the dose is lower than the dose threshold.big.The random effect includes radiation carcinogenic and genetic diseases in which animal experiments have increased.They can only appear for a long time after being illuminated. There is no dose threshold. The probability of occurrence is proportional to the dose, but the severity has nothing to do with the dose.

In a single CT examination, the radiation dose accepted by the inspector is very low, which is far lower than the dose level that causes certainty damage.If the subject is repeatedly undergoing radiological examinations, it cannot completely eliminate the occurrence of certain effects. Local skin erythema, hair removal, ulcer, and even necrosis, or tissue response such as cataract can occur.

For most subjects, the cumulative radiation dose of CT examination is very small, and the risk of radiation induced cancer is very low.However, epidemiological evidence shows that the increase in cumulative radiation doses can cause increased cancer risk.In addition, at a very low dose level, although the risk of random effects is very low, it still exists.

Therefore, in the clinic, the principle of optimizing the optimization of radiation protection should be strictly implemented, and radiological examinations with relatively small dosage should be selected as much as possible, and the time interval of twice radiological examination is controlled.

Under the guidance of clinicians, patients with cough can first choose a relatively small conventional film inspection.Conventional films can provide a lot of information, which is more convenient.On this basis, patients invite clinicians to help determine whether to do a CT examination.

What should I pay attention to when CT check

The CT inspection machine room door is usually affixed with the "ionizing radiation warning signs", suggesting that we do not stay at the door of the computer room at the time of waiting to avoid unnecessary irradiation.When the working status of the CT inspection machine room is on, we should not enter the examination room without authorization, and we should obey the arrangements of the medical staff.

When performing a CT examination, the scope of the irradiation should be strictly controlled to avoid directly illuminated by sensitive organs or tissues (such as gland, eye lens, breasts, and thyroids).

Medical institutions should equip the subject with necessary radiation protection products, and take necessary shielding protection measures for sensitive organs or organizations nearby in the field.It is recommended to use parcel -type shielding protection measures to the subject in CT scanning.

When CT inspection is performed, other personnel shall not stay in the computer room.When the subject needs to assist, the companion should take the necessary protection measures.Common personal protective products include lead rubber gland protective apron (square) or square scarf, lead rubber neck cover, lead rubber hat, lead -containing glass protective glasses.

When a CT examination in the hospital, if the doctor does not provide relevant protective supplies, the person who accepts the inspector shall take the initiative to propose to wear the protective supplies in the inspection room to avoid electrical radiation from the thyroid, reproductive organs and eyes.

Children, pregnant women, childcare women and other people are sensitive people with radiation damage.Before the CT examination is performed, the doctor should conduct strict judgments to avoid unnecessary CT examinations and optimize the exposure parameters.

Before receiving the CT examination, women of childbearing age should inform the medical staff that they may be pregnant or plan to get pregnant, so that medical staff can make more reasonable diagnosis and treatment arrangements.Women who have become pregnant or may be pregnant can only irradiate radiological examinations of their abdomen or pelvis only when they have a clear indicator of disease risk.

Text: Xiao Hong Wang Binfeng, a Shanghai Disease Prevention and Control Center

Source: Health News

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