Imaging method and system for reflecting cavitation bubble size space-time distribution

Abstract

The invention discloses an imaging method and system for reflecting cavitation bubble size spatial-temporal distribution. The method comprises the steps: extracting subharmonic signals of different orders from spatial two-dimensional radio frequency data, obtaining three threshold matrixes through employing data before cavitation bubble generation, and obtaining three signal intensity matrixes through employing data after cavitation bubble generation; and after noise reduction is carried out after comparison of the three threshold matrixes and the signal intensity matrix, color coding is carried out on harmonic signals of different orders, and an imaging graph of cavitation bubble size space-time distribution is obtained. The method provided by the invention belongs to the field of activecavitation imaging, the sensitivity of cavitation bubble detection is further improved by utilizing sub-harmonic extraction and combining a pulse reversal technology, real-time space imaging can be carried out, the space distribution of the cavitation bubble size and the change condition in time are approximately reflected, and the accuracy of cavitation bubble detection is improved. And the spatial position distribution of cavitation bubbles of different sizes and the approximate proportion of the cavitation bubbles in the cavitation bubble group can be generally reflected, and the method issuitable for various occasions where the cavitation bubbles can be generated.

Description

【Technical field】 [0001] The invention belongs to the field of ultrasonic detection and imaging, and in particular relates to an imaging method and system for reflecting the temporal and spatial distribution of cavitation bubble sizes. 【Background technique】 [0002] The ultrasonic cavitation effect refers to the dynamic process in which the micro-air nuclei in the liquid form cavitation bubbles under the action of sound waves, and vibrate, grow and collapse under the action of the sound field. The cavitation effect can be applied to high-intensity focused ultrasound (HIFU) therapy, promoting chemical reactions, crushing liquid suspensions, making emulsions, killing bacteria, and ultrasonic cleaning, etc. Different applications use different ultrasonic frequencies, which produce cavitation bubbles in different size ranges. The size and distribution of cavitation bubbles are closely related to the actual effect of the application. [0003] In high-intensity focused ultrasou...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide an imaging method and system for reflecting the space-time distribution of cavitation bubbles, which is used to solve the problem of long measurement time for determining the size distribution of cavitation bubbles in the prior art and difficulty in reflecting the space-time distribution of cavitation bubbles. The spatial distribution of bubble size, and the technical problem of low sensitivity when detecting cavitation bubbles with second or higher harmonics

Images