Do medical devices used in hospitals emit radiation?


Hospital radiology exams usually include three types: DR, CT, and MRI. what is the difference between the three?

DR examination

DR examination is also in the ordinary X-ray film on the basis of the development of digital X-ray, a little to understand, is the advanced version of the traditional X-ray, but the essence is still almost the same, or the main use of X-rays of the principle of penetrability. Although the examination area and ordinary X-ray film are the same, but the image resolution of DR is significantly higher than X-ray, and the radiation dose is also reduced very much.

DR is commonly used to take pictures of the chest and bones of the human body, as well as other parts of the body, such as the abdomen, teeth, and head. The use of a wider range of people, you can check all parts of the body, exposure can be obtained in a few seconds after the digital image, imaging speed, and inexpensive, greatly improving the efficiency of the work, to facilitate the clinical diagnosis and treatment of patients with serious illnesses and emergencies.

The standing X-ray image is the preferred examination content for determining the biological force line of the weight-bearing skeleton, the symmetrical structural smooth line and the scoliosis angle of the spine, which is fundamentally different from the CT and MRI prone imaging in the clinical significance. In the clinical treatment of the spine and lower limbs, generally need to carry out corrective and joint replacement surgery, before and after the surgery, need to take standing weight-bearing X-ray film in order to analyze the condition, clear diagnosis and observation of the effect of treatment.

The maximum size of conventional DR imaging is only 43cm, but the average length of the entire spine is 70-75cm for adult men and 66-70cm for women, and the length of both lower limbs is even longer. The 43cm*86cm large effective field of view of PLX8600 Dynamic DR can image the whole spine and both lower limbs at one time.

CT examination

The principle of CT examination is that X-ray passes through the human body in layers, which is like slicing bread into thin slices, and each slice can be spread out for viewing. When experiencing trauma and suspecting injury to bone, CT can be chosen to observe hidden injuries or soft tissue injuries.

CT is suitable for head, chest, abdomen, pelvis, spine, limbs, bones, etc. Due to its special diagnostic value, it has been widely used in clinic, especially in the diagnosis of tumor. However, as CT equipment is more expensive, the examination cost will be high, and there is still a certain limit to the examination and diagnostic value of certain parts, especially qualitative diagnosis, so CT examination is not regarded as a routine diagnostic means in clinical practice. In addition, CT diagnostic radiation is greater than DR, so women who are pregnant or preparing for pregnancy should not undergo CT examination.

MRI examination

MRI, also known as Magnetic Resonance Imaging, is a type of tomography, which utilizes the phenomenon of magnetic resonance to obtain electromagnetic signals from the human body and reconstruct information about the body. The examination allows images to be obtained in the cross-sectional, sagittal, and coronal planes with high spatial resolution, making it the first choice for the detection of the nervous system and the vertebral portion of the spine.

Whether it is DR or CT, due to the lack of resolution of some soft tissues, so the soft tissue disease detection becomes their short board, and the strength of magnetic resonance is precisely the clear display of soft tissue disease, for the bladder, rectum, uterus and joint muscle examination is superior to CT. MRI is suitable for neurological lesions, cardiovascular system, thoracic lesions, systemic soft tissue lesions and so on.

Is there radiation associated with radiography?

There have always been patients who refuse to have imaging tests because they are worried about radiation. As a matter of fact, radiation is everywhere, such as radiation from strong ultraviolet rays, computers, cell phones, and so on, all of which are faced every day, and they do not cause harm to the human body.

The commonly used unit of radiation dose is (mSv), and China stipulates that each radiologist should not be exposed to more than 20 millisieverts per year, within which it is relatively safe. Obviously, the person being examined is not taking any greater risk than the doctor. And medically speaking, the probability of the human body developing cancer generally increases significantly only when exposed to a radiation dose of 100 mSv or more. We usually come into contact with the means of examination, the radiation dose and this value gap is very large, for example, we often say that the film, that is, X-ray examination, it is very low radiation dose to the human body, only 0.1 mSv, equivalent to the natural radiation that human beings in the earth 10 days of life received. With this kind of data comparison, don’t you also think that radiation is far less scary than imagined?

The radiation levels of X-ray and CT examinations are also within the safe range. Therefore, when undergoing examination, the dose of radiation does not cause harm to the patient’s body, and there is no need to choose not to do the examination because of the existence of radiation, ignoring the health.


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