Compared with computerized tomography (CT) of electronic equipment, magnetic vibration technology is safer and less harmful to the body, but its innovation and ease of use are short, and many people lack basic knowledge about it.
What is the noise of magnetic vibration inspection? These noises are caused by the vibration of gradient switch caused by current interruption. Without these gradient systems, magnetic vibration will not form the transmission and reception of signals, let alone valuable image information. It is the periodic gradient switching that leads to the repetition of noise. The stronger the gradient magnetic field, the higher the noise. With the continuous progress of science and technology, the noise level related to the gradient magnetic field formed by magnetic resonance imaging equipment is 65~95dB, which is within the safety range recognized by FDA, the international medical auditing authority.
When the patient cooperates with the staff to wear the special earphone or earmuffs completely, the hearing of the patient will not be damaged. At present, the equipment studied by merchants has long considered the influence of noise on patients, and actively adopted noise reduction technology, so that patients can receive magnetic resonance examination as safely and comfortably as possible, so patients must relax when receiving magnetic resonance examination. These noises are inevitable and within the tolerable safety range.
What are the four common senses about magnetic vibration technology? 1. Is there a radiation source?
Magnetic resonance imaging is different from CT. Magnetic resonance imaging does not use x-rays from strong radiation sources as an auxiliary means. The essence of magnetic vibration is to find the trajectory of hydrogen atoms in somatic cells, and then calculate it many times on this line of action, and draw the final image with computer. It is not easy to have a radiation source.
Compared with CT, the imaging accuracy of magnetic resonance is higher, and it can make cross-sectional, coronavirus, three-dimensional and other image solid models, and can analyze diseases from several aspects, which is very important for doctors' observation and diagnosis.
2. Is the contrast agent safe?
Before magnetic resonance imaging, it is very likely that contrast agent will be injected, and many people are worried about whether this will have adverse effects on the body. Contrast agent is an auxiliary means, which can be used to improve the actual effect of imaging. The contrast agent can also accompany the blood to spread all over every organ in a short time, thus helping doctors to distinguish whether the structural organs are normal or not while imaging, and also to distinguish whether the diseased organs are reasonable or malignant.
Contrast agent is essentially a drug. Some patients will feel uncomfortable after touching, mainly including mild symptoms such as nausea and vomiting, but more serious, it may also cause side effects such as visceral pain and poor breathing. Be sure to pay attention to your physical condition immediately after using contrast agent, and communicate with your doctor immediately if you have any reaction.
3. Noise during inspection
In the case of magnetic vibration, patients are likely to hear a lot of noise, but don't worry too much. This is also the accurate positioning of the equipment in the indoor space. Simply put, it is to specify the specific address of the person lying on it.
If you feel that the noise is too loud and make a scene, you can wear earmuffs or cell phone headphones, which are usually given in hospital clinics.
4. Frequently asked questions
A very important and common problem in magnetic vibration is that all metal materials to be removed, including but not limited to Fe-Co-Ni-Al alloy, especially female patients, should be replaced with underwear without metal lining in advance, otherwise it is likely to cause embarrassment.
If there are copper sheets in the internal structure of the body, patients with pacemakers should communicate with doctors in advance to determine whether they can be tested to prevent unpleasant adverse effects.