The scanner is an examination that also uses X-rays like conventional radiography, to build an anatomical image of very high quality thanks to powerful computers that recreate detailed images in 3D.

Principle of the examination

The scanner is a very wide ring-shaped device that rotates at high frequency. This device is equipped with X-ray transmitters and receivers that capture them to form contrasting images. It is also called a “computed tomography” (CT) when the CT scan uses the tomography technique that provides images of different sections of the total organ (horizontal, vertical or oblique cut) that must then be assembled to reconstruct the organ in its total volume.


You may have an iodinated contrast medium injected by the radiologist (venously). This product aims to increase the density of certain tissues (which will capture this product), and to improve the detection of certain lesions by creating contrast between the different surrounding tissues. The scanner must be carried out as soon as possible after the injection of the contrast medium.

Conduct of the examination

You are taken care of by a member of the medical team who accompanies you in the examination room. You are lying on your back on a table and asked to remain still while the table moves through the ring during the exam. The duration of the examination varies depending on the exploration to be conducted. Some tests ask you to hold your breath for several seconds.


Pregnancy is a contraindication to this examination. If you have certain medical conditions: diabetes, kidney failure, glaucoma, hyperthyroidism, etc. certain precautions must be taken. Please report this to the radiologist.