A Transcranial Membrane Piezoelectric Micro-nano Array Ultrasonic Transducer

Abstract

The invention relates to a transcranial thin-film piezoelectric micro-nano array ultrasonic transducer, comprising: a thin-film piezoelectric micro-nano array, an acoustic soft supergel material layer, an acoustic lens and three matching layers; the three matching layers are respectively The first matching layer, the second matching layer and the third matching layer; the thin-film piezoelectric micro-nano array is used to transmit ultrasonic waves or receive ultrasonic waves reflected by the object to be measured; the first matching layer, the acoustic lens, the second matching layer, the acoustic soft The supergel material layer and the third matching layer are sequentially arranged on one side of the thin-film piezoelectric micro-nano array along the emission direction of the ultrasonic waves; The supergel material has complementary properties with the equivalent mass density and equivalent bulk modulus of the skull, which are equal to and opposite to the positive and negative values, and are used to achieve impedance matching between the thin-film piezoelectric micro-nano array and the skull. Non-invasive transcranial ultrasound imaging of ultrasound transducers was achieved by using layers of acoustically soft supergel material.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection and ultrasonic imaging, in particular to a transcranial membrane piezoelectric micro-nano array ultrasonic transducer. Background technique [0002] For transcranial imaging, existing technologies such as nuclear magnetic resonance imaging and computed tomography imaging are widely used in clinical practice, but they cannot achieve real-time imaging and have certain radiation safety hazards to the human body. At present, near-infrared optical methods are also used to try transcranial imaging, but because the skull has a strong scattering or absorption effect on light, it is generally necessary to detect in relatively weak places of the skull, or to grind / remove the skull, which is difficult to achieve non-invasive detection. [0003] Ultrasound technology has the advantages of real-time imaging, non-invasive, non-destructive, and non-ionizing radiation. It has been applied in the diag...

AI Technical Summary

Problems solved by technology

However, due to the mismatch between the skull and the background acoustic impedance, a large amount of absorption and reflection of the ultrasonic signal will be caused, and the imaging resolution when used in ultrasonic imaging is low, and it is impossible to obtain information useful for diagnosis.

Images