Piezoelectric cantilever beam contact vibration-based superficial tissue elastic imaging system

Abstract

The invention discloses a piezoelectric cantilever beam contact vibration-based superficial tissue elastic imaging system and an imaging method. According to the system, elastic modulus of a tissue or organ to be detected is calculated through detected piezoelectric detection beam contact resonance frequency so as to form an elastic modulus distribution image, and further, quantitative evaluation is performed on the rigidity and a health state of a target to be detected. The system is suitable for elastic imaging of surface layer tissues, particularly elastic imaging of organs such as mammary gland and thyroid gland. The system has high detection sensitivity to hardened tissues and has stronger resolving power to the hardened tissues than touch sensation of fingers of a human body. The resolving power of imaging of the system can reach millimeter level and can finish accurate imaging of edges of the hardened tissues, so that the tissues can be more timely and accurately evaluated.

Description

technical field [0001] The invention belongs to the field of medical devices, in particular to a superficial tissue elastic imaging system based on piezoelectric cantilever beam contact vibration. Background technique [0002] Elastography is a biological imaging technology that has developed rapidly in recent years. It can reflect the difference in elastic modulus of different tissues. The basic principle of elastography is that tissues with different elastic moduli respond differently to mechanical excitations imposed by the outside world. The modulus of the tissue can thus be measured by probing the tissue's response to the excitation. [0003] Elastic imaging technology mainly focuses on mechanical information such as the stiffness modulus of biological tissue, which is closely related to the nature of the lesion (for example, through experimental tests on surgical specimens, the elastic modulus of breast cancer is 5 to 20 times higher than that of normal tissue) , so e...

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Problems solved by technology

[0004] Traditional finger palpation can judge the hardness of the tissue by pressing the finger on the area to be tested, so as to perform pathological diagnosis, but finger palpation relies heavily on the doctor's subjective experience, and cannot quantitatively give the hardness value, so in diagnosis Limited in accuracy and generalizability

At present, some new ultrasonic imaging technologies proposed in scientific research papers can realize the imaging of tissue modulus, but due to the near-field effect of ultrasonic probes, it is difficult to realize the measurement of superficial tissues; In most cases, it is difficult for the ultrasound imaging system to detect tiny calcifications and spiculation changes in the breast; in addition, most acoustic images lack specificity and the blood flow signal is not obvious, so it is easy to misjudgment

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