Ultrasound imaging probe for imaging a temporary change in an environment

An ultrasonic imaging probe for imaging a medium, comprising:

• a first type of ultrasonic transducers configured to perform an ultrasonic imaging of the medium, having a first focus in the medium and a first resonance frequency, and
• a second type of ultrasonic transducers configured to generate a stress producing a transient movements of the imaged medium, having a second focus in the medium and a second resonance frequency,
• wherein the second focus generates said stress producing transient movements as deep as depth of ultrasonic imaging obtained with the first focus, and the second resonance frequency is lower than first resonance frequency,
• the first and second types of ultrasonic transducer having different focuses so that field of said stress producing transient movements is larger than field of said ultrasonic imaging while maintaining said probe in a fixed position relative to said medium,
• the first and the second types being configured to operate at least in a coupled mode wherein the first and the second types are synchronized so as to image the medium during progression of the transient movements to obtain images of progression of transient modification of the medium, and
• the second type of ultrasonic transducers have a focus in the medium deeper than a further focus of the first type of ultrasonic transducers.