Method for ocular ultrasound with annular transducers

An ocular echography method using an ultrasonic probe including a plurality of transducer elements organized into at least n concentric rings forming n transducer rings, wherein the transducer rings are grouped into several groups of rings each grouping between 1 and n−1 transducer rings, each group of rings being differentiated from another group of transducer rings by at least one transducer ring different from the transducer rings of said other group of transducer rings, the groups of rings being equal to a number k, the method comprising the following steps:

• a) for each cycle of a plurality of cycles of k iterations, each iteration involving a group of different transducer rings, each cycle running through the set of the k groups of transducer rings, during each iteration:
• a1) exciting a group of transducer rings so that the transducer rings of said group of transducer rings emit ultrasonic waves at an emission frequency;
• a2) recovering n measurement signals from the n transducer rings, each measurement signal resulting from the reception by a transducer ring of reflected ultrasonic waves resulting from the emission of ultrasonic waves by said group of transducer rings;
• a3) combining the n measurement signals to give an echographic line, said echographic line being representative of the response of the n transducer rings to the emission of ultrasonic waves by said group of ultrasonic rings;
• b) combining into a displayable line of k echographic lines resulting from the most recent k iterations;
• c) processing and displaying the displayable lines.