Nuclear magnetic **** vibration more powerful than CT! Simply think, that is not, the name with "nuclear" can not cattle, nuclear bombs, nuclear submarines, nuclear-powered aircraft carriers; and then look at the hospital's nuclear magnetic examination queue, light is a small week, more than a half a month, not powerful can so many people waiting to do? So often have some friends to see a doctor, CT did not find a problem, will put forward: "Do not get a nuclear magnetic bar?". .
1, magnetic **** vibration and CT radiation problems
Today, I want to correct this point of view, nuclear magnetic **** vibration of the English language is: Magnetic Resonance Imaging, directly translated to magnetic **** vibration imaging, referred to as MRI, and did not mention the "nuclear", but why would it be called nuclear magnetic **** vibration? Because the imaging principle of MRI is to use a magnetic field to make the body's atomic nuclei to produce movement and discharge, and this process is not like a nuclear weapon nuclear reaction releases huge amounts of energy, so it is said that MRI is no electromagnetic radiation.
CT in English is: Computerized Tomography Computerized X-ray tomography, because the use of X-ray, so the CT is electromagnetic radiation, for children, pregnant women generally do not arrange CT examination.
2, magnetic **** vibration and CT examination which is more accurate
Magnetic **** vibration of the advantages lies in the soft tissues of the resolution more clear, especially some small foci, such as tumors, it can be more easy to clear is not cancer, but disadvantages are also very obvious . : ① check is too slow, the same part of the CT less than a minute to scan the end, and the magnetic *** vibration needs half an hour, which is why the magnetic *** vibration queuing for a long time the reason: do too slow! Magnetic *** vibration for the stationary parts of the examination is more clear, for the active parts of the examination of the image will be blurred (like taking pictures of the same as moving), so the magnetic *** vibration for the brain, spinal cord, liver, pancreas, pelvis, urinary system, bones and joints and other relatively static parts of the application of the more in the lungs, the gastrointestinal tract, which is difficult to control the activities of the parts of the application of the very little to the children to do the magnetic *** vibration is also difficult to do Because they will not be able to resist the activity; ② the second is the body can not be examined on the metal, placed a pacemaker, birth control rings, dentures, patients can not do the magnetic *** vibration examination, not only to interfere with the results of the examination, but also dangerous; ③ the cost is more expensive, which is related to the price of the equipment, the cost of maintenance and the efficiency of the examination.
The advantage of CT is that it is fast and accurate, even in the lungs, the gastrointestinal tract, these parts can have a very clear imaging effect, of course, when doing CT, hold your breath to check the effect is better. Emergency patients are usually scheduled for CT, even if they have a brain hemorrhage, because it is difficult for patients to keep their bodies inactive for long periods of time in very uncomfortable situations. CT disadvantage is for soft tissue resolution is lower than the magnetic *** vibration, especially for the resolution of small lesions, bone, metal, as in CT can produce artifacts interfere with the clarity of the image, so in the head, the spinal cord, this kind of bone wrapped around the tissue of the parts of the magnetic *** vibration advantage is more obvious.
3, why rectal cancer to do magnetic *** vibration, colon cancer not do?
1) As mentioned above, magnetic **** vibration is afraid of "movement". The rectum adjacent to the anus, in the pelvis, surrounded by soft tissue, muscle fixed, small mobility, while the colon in the abdominal cavity, large mobility. In order to reduce intestinal peristalsis, in the rectal magnetic **** vibration can also be temporarily injected with scopolamine, the imaging effect is more satisfactory.
②The rectum is adjacent to the anus, and the surgery is more difficult, involving the question of whether to operate for anal preservation and the assessment of postoperative anal function, which requires more detailed evaluation. For relatively small tumors in the middle and lower rectum, the role of endoluminal ultrasound can be played at the same time.
3) The proportion of liver and lung metastasis is higher in the middle and late stages of intestinal cancer, so for patients with rectal cancer, we comprehensively utilize the respective advantages of magnetic **** vibration and CT, and choose thoracic and abdominal CT+pelvic magnetic **** vibration, and in the case of colorectal cancer, thoracic and abdominal CT is chosen.
So every technology is not perfect, what we doctors need to do is to fully understand the advantages and disadvantages of each test and choose the most suitable test for the patient.