They use an ultrasound machine.
The first imaging technique for the human body was discovered by Wilhelm Röntgen in 1895.
MRI
Prise de sang
An MRI scan
Magnetic Resonance Imaging (MRI) or Nuclear Magnetic Resonance Imaging (NMRI)
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Magnetic Regonance Imaging (MRI)
ultrasound imaging
Eye
ultra sound
PET (Positron Emission Tomography) is a very modern and expensive medical imaging technique.
Positrons are used for 'PET', a medical imaging tomography technique. The positrons are produced in the radioactive decay of Sodium 22.