Ultrasonic imaging method and device

Abstract

The invention discloses ultrasonic imaging method and device. The method comprises the following steps of: firstly carrying out coded modulation on a pulse generating an acoustic radiation force, and exciting a probe to emit an ultrasonic wave to generate a multi-frequency acoustic radiation force to generate tissue vibration; then adopting the coded modulation different from an exciting pulse for the pulse detecting the tissue vibration, ensuring the good correlation between two code words, and eliminating the interference caused by an exciting pulse echo generating the acoustic radiation force for a detection echo by utilizing a CDMA (Code Division Multiple Access) technology similar to communication, thereby improving the signal-to-noise ratio and increasing the energy of the acoustic radiation force by more fully utilizing the pulse width and the frequency band width resources of a system.

Description

technical field [0001] The invention relates to an ultrasonic imaging method and device applicable to the fields of ultrasonic nondestructive testing, medical ultrasound, ultrasonic elastography and the like. Background technique [0002] The basic principle of elastic measurement is to apply a pressure to the tissue. Under the action of elastic mechanics, biomechanics and other laws, the tissue will produce a response, including displacement, deformation, etc. The response of tissues with different elastic modulus or hardness will be different. Ultrasound, nuclear magnetic resonance or optical methods are used to detect the response inside the tissue, so as to reflect the elastic properties of the tissue. [0003] Acoustic radiation force elastography is a type of ultrasound elastography. Ultrasonic waves are emitted to an object, and the absorption and scattering of the incident ultrasonic waves by the object causes a change in the sound energy density, thereby generating...

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Problems solved by technology

[0009] However, in practical applications, the above-mentioned method of generating acoustic radiation force has disadvantages: the excitation pulse that generates acoustic radiation force will cause great interference to the detection echo after reflection

[0011] Although the above two solutions can solve the interference problem, the processing process is relatively complicated, which wastes pulse width and frequency bandwidth resources.

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