Here are the questions you need to answer to choose a transcranial Doppler

Do you want to perform transcranial Doppler monitoring sessions
or only transcranial Doppler diagnosis examinations?
During a transcranial Doppler diagnosis examination, the probe is hold by the user.
During a transcranial Doppler monitoring session the probe is maintained on the patient's head thanks to a headband or a headframe and the recordings are stored on the hard disk during the whole monitoring session (several hours).

If you need a transcranial Doppler monitoring module, must it be unilateral or bilateral?
A unilateral monitoring module measures the blood velocities on one side of the brain at once as a bilateral monitoring module measures the blood velocities on both sides of the brain simultaneously.

Do you need the emboli detection module?

Do you need to perform vasocerebral reactivity test?

Do you need a non invasive cardiac output module?
The Atys Medical transcranial Doppler devices can be fitted with a non invasive cardiac output monitoring module.

Do you need a 16 MHz module?

Do you need a portable transcranial Doppler or one integrated into an ergonomic trolley?