Do you have to give up your baby when you do X -ray or CT during pregnancy?

This is a real case: In a hospital in a hospital, a pregnant woman who is 6 months pregnant has a sudden kidney colic. The urology suspects that it is kidney stones, but the B -ultrasound has no abnormally discovery. The patient’s back pain is intensified and the diagnosis cannot be confirmed.After discussion, CT examination must be performed.A simple examination problem, but because the special nature of the patient rose to the state of the adult or child, the patient and family members decided to conduct the abdominal pelvic CT scan.It is harmful, different from the ignorance and fear of non -electronic radiation generated by mobile phones, microwave ovens, etc.), and decides to abandon the baby in the stomach.

As a doctor of radiation, I have to say that this is a sad story. What is more tragic is that this story is often staged in various places.

In recent decades, due to the needs of the condition, pregnant women need to receive radiation examinations.Data show that in the past ten years, radiation examinations have increased by 107%, and pregnant women, family members, and even medical staff have insufficient understanding of this, and many pregnancy has been terminated by mistake!

In fact, after pregnancy, most of the X -ray, or even CT examination, the uterus was not directly irradiated, and the radiation of the fetus was very small.Because the fetus is well protected by the mother, including skin, subcutaneous fat, uterine walls, amniotic fluid, etc.For example, when the head CT scan is performed, the radiation of the fetus is even 0. Of course, the abdomen must be protected by lead clothes at this time.Take the most extreme example. In the most commonly used radiology examination (excluding PET-CT) in clinical practice, the most serious radiation is direct irradiation from the abdomen and pelvic X-ray or CT.The maximum amount can reach 25msv (but the current CT technology can be lower than this value).Can children want it at this time?

Conventional inspection of radiation doses is a low -risk irradiation

Usually, when medical treatment of a disease or a guide to a medical behavior, a lot of experiments need to be used to obtain sufficient evidence to give.However, in this case, human experiments cannot be performed, but according to a large number of clinical observations and analysis of some nuclear radiation time in history, many countries in the world have proposed their own guidance. For example, the National Radiation Protection and Measurement Commission proposedWhen the fetal irradiation dose is less than 50mgy (about equal to MSV), the risk can be ignored.Radiation examinations for diagnostic purposes are not indications to terminate pregnancy.Everyone note that it is 50mgy, and the abdomen and pelvic CT are 25msv when the above -mentioned abdomen and pelvic CT scan, for this dose.Almost all diagnosis in clinical examinations is lower than this value. For example, taking a positive chest of the chest, the radiation dose of the fetus is 0.002MSV, which can be ignored.Even CT scanning, most of the inspection is lower than this dose. For example, the common chest CT scan, the radiation dose of the fetus is only 0.2MSV.What concept?Most people living on the planet, even if they never enter the gate of the hospital, have to accept radiation from the universe. This dose is 2.4 to 3.1msv each year.Most concepts believe that when the radiation dose of conventional population is less than 50msv, it is a low -risk irradiation.Therefore, it is necessary to prevent unnecessary radiation, but it is not necessary to be too afraid.

Another case is that when I did X -ray or CT inspection, I found that they were pregnant in the month, and then many people thought that the child was too fragile at this time and it must not be required.This idea is also wrong. In the month of pregnancy, if the X -ray or CT examination within 30 days from the first day of the last menstrual period, the impact on the fetus is completely or ineffective, that is, either the child will flow or stay or stay.It’s okay.

When the necessary inspection, the first choice is the first choice

Of course, during pregnancy, if necessary, the first choice of power -free radiation imaging examination, such as B -ultrasound and Magnetic resonance (MRI).Both are proven to be safe for the fetus.However, in some special cases, when B -ultrasound or MRI cannot solve the problem, you can choose CT carefully, such as appendicitis, pulmonary embolism, renal colic, trauma, etc.At this time, the radiation dose is evaluated, but it must be noted that most of the doses of the X -ray and CT examinations used clinically are safe for the fetus.

Creation of Yang Xuedong, Department of Radiology, Guang’anmen Hospital of China College of Traditional Chinese Medicine

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