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Patient information
What is Magnetic resonance imaging?
Basic principle
Magnetic resonance imaging (MRI) is a diagnostic method which is used to generate
slice images in medicine. This method is based on the principle of magnetic resonance. The magnetization of hydrogen molecules is aligned in a strong magnetic
field. Through additional activation of a high frequency field (like radio waves), the
magnetization is tilted and moves like a pushed spinner. After turning off the radio
waves, magnetization returns to its starting position. This leads to a signal which is
detected by an antenna placed on your body.
Examination preparation
Since you are in a strong magnetic field, it is very important to remove all metallic
objects like jewellery, clothes with metallic applications, glasses and false teeth. Metallic plumbs and bridges are completely harmless.
Because of the long duration (30-90 min) it is advisable to go to the toilet before the
examination starts.
For specific groups of persons this examination is not suitable. If you want to know if
you may belong to such a group, please complete the questionnaire or speak with
your physician.
Examination procedure
You will be placed comfortably on our examination table. For most examinations we
need an ECG throughout the examination. Therefore electrodes will be placed on
your chest. For the measurement of the magnetic signals we will place an antenna on
the area of interest. During scanning you will hear a loud noise. To reduce this
“knocking” you get ear plugs or head phones. Throughout the whole examination you
will be monitored by a camera.
Through an interphone you can talk to us at any time. With a small bell you can ring if
you want to stop the examination. For some scans it is important to hold your breath.
We will lead you through this process continuously. Please do not hesitate to ask if
you have any questions.