How can I lock up radio waves
When should an MRI scan not be performed?
If you have a pacemaker! In the case of other implants, especially those with electronic or metallic components, it must be decided on a case-by-case basis whether the examination is safe for you. Metallic foreign objects are particularly problematic near the eyes.
During pregnancy and especially in the first 3 months, a magnetic resonance tomography examination should only be carried out if there are important questions. So far there is no evidence that magnetic resonance imaging poses a risk to pregnancy.
In order to exclude a hazard with absolute certainty, however, one needs even more experience and knowledge with this method.
How long does an MRI scan take?
The measurements usually take 15 to 30 minutes each for an examination region. For the entire examination, including the preparation and the subsequent evaluation with the doctor's consultation, you have to calculate about an hour and a half in the practice.
What do I have to consider when making an appointment?
An appointment is usually necessary. A declaration of consent from their parents is required for the administration of contrast media in children and adolescents under 18 years of age. When you make an appointment, you will be asked whether you have a pacemaker and
must absolutely indicate this. If you suffer from claustrophobia, please indicate this when making an appointment.
What do I have to bring to the examination?
Please bring the transfer slip and insurance card with you for the examination. If you are privately insured, you should have precise information about the type and reason for the desired examination. Be sure to bring previous recordings or results of previous examinations with you to the examination!
Do I have to prepare for the exam?
You do not have to make any further preparations for the examination.
I have claustrophobia. Can I still use the magnetic resonance tomograph?
In more severe cases of claustrophobia, we can give you an anti-anxiety agent as an injection. That’s the
Investigation is no longer a problem for you. However, they are then no longer allowed to participate in road traffic. Please bring for
in this case an accompanying person.
If you suffer from claustrophobia, the examination is often possible without any problems if you realize that you will be in contact with us during the entire examination. It often helps if the assistant announces the start and duration of the measurements. Turn to the helpers with confidence.
Can children also be examined in magnetic resonance imaging?
Even children from three years of age can be surprisingly cooperative if the examination is explained to them accordingly and a parent or someone they trust is in the examination room. It's always worth trying, at least.
Risks, possible complications
The contrast agent used in magnetic resonance imaging is extremely well tolerated. It can also be used in children and infants and can also be used in the case of impaired kidney function. However, there are also hypersensitivities to this contrast medium with allergy-like reactions such as nausea, itching and skin rashes. Real allergic reactions are extremely rare. They can lead to severe shock effects and permanent damage and require inpatient treatment. Of course, we have the appropriate medication and equipment available for the initial treatment.
It can rarely happen that a venipuncture was not hit optimally or the vein bursts during the injection of contrast medium. The contrast medium is then distributed in the adjacent tissue and can lead to painful swellings and reddening or even to inflammation. However, the contrast agent is eventually broken down by the body itself and the symptoms usually subside without consequences.
So far there is no serious or even scientific evidence of permanent changes or even damage to the human body due to the high magnetic field and the radiated radio waves in magnetic resonance imaging.
The publications on the damaging effects of magnetic fields or radio waves (electrosmog), which are mainly published in the media, are scientifically very controversial on the one hand, and on the other hand mainly refer to long-term magnetic field effects and permanent exposure to radio waves.
Medical technical basics
Inside the tubular opening of the magnetic resonance tomograph there is a very strong magnetic field with a field strength of 1.5 Tesla (15,000 times the force of gravity). Within this magnetic field, the nuclei of the water particles, of which our body largely consists, align themselves to the north or south, like magnetic needles. However, these water particles are not rigid but have a vibration that is imperceptible to us. This is known as spin. This oscillation is stimulated by radiation of radio waves and the water particle is "folded out" from the north-south direction. If the radiation of the radio waves is stopped, the particle “snaps” back in the north-south direction. This creates so-called induction currents. These small electrical impulses can be measured.
The magnetic field within the magnetic resonance tomograph is additionally graduated in all three spatial directions by means of a coil system. Switching these coil systems on and off generates strong knocking noises and is the cause of the noise impairment during the magnetic resonance tomography examination.
However, only through this gradation of the magnetic field is it possible to precisely assign which water particle sends an impulse from which area of the body. Using a complicated mathematical process, an extremely high-contrast layer image of the human body can be obtained from this information in any spatial direction.
The behavior of the water particles, the "unfolding" and "snapping back" always depends on the tissue in which the particles are located and whether this tissue represents healthy tissue or diseased tissue. This creates contrast.
Because human tissue also contains very different proportions of water and the proportion of water as well as the blood flow situation in diseased tissue is changed, the organs and structures can be precisely recognized and assessed on the magnetic resonance tomography images.
In the Dürerhof, two Espree MRTs from Siemens from Erlangen with the latest coil technology and comfortable space for our claustrophobic patients (wide-open MRT) are used. We also use an MRI Magnetom Aera 1.5T of the latest series for special, demanding examinations.
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