20-MHz ophthalmic ultrasonic imaging method, device and equipment

Abstract

The invention provides a 20-MHz ophthalmic ultrasonic imaging method and device and 20-MHz ophthalmic ultrasonic imaging equipment. The 20-MHz ophthalmic ultrasonic imaging method comprises the following steps: through a pair of Gray codes of a Gray positive sequence code and a Gray inverse sequence code, sequentially and alternatively exciting a single-array-element transducer to make the single-array-element transducer sequentially emit ultrasonic signals for 2N times, so as to form 2N scanning lines; after emission is completed each time, receiving an echo on each scanning line through thesingle-array-element transducer, conducting Gray positive code matched filtering on the echos on the scanning lines excited by the Gray positive sequence code, and conducting Gray inverse code matchedfiltering on the echos on the scanning lines excited by the Gray inverse sequence code; overlapping the corresponding echos, subjected to filtering, on each two adjacent scanning lines to form (2N-1)echo scanning lines; and according to the (2N-1) echo scanning lines, conducting fan-shaped ultrasonic imaging of eyes. Compared with the prior art, the 20-MHz ophthalmic ultrasonic imaging method and device and the 20-MHz ophthalmic ultrasonic imaging equipment have the advantages that application of Gray complementary sequences in ophthalmic imaging is achieved, and a signal-to-noise ratio andthe detection depth of ophthalmic ultrasonic imaging are improved.

Description

technical field [0001] The invention relates to the technical field of medical ultrasonic imaging, in particular to a method, device and equipment for 20MHz ophthalmic ultrasonic imaging. Background technique [0002] Ultrasound imaging technology in ophthalmology is a diagnostic method widely used in clinical practice at present. Compared with the traditional 10MHz ultrasound, 20MHz ultrasound has a higher image resolution effect on the fine structure of the eyeball wall and the imaging of cataract crystals. However, due to its high frequency and fast attenuation, the imaging of deep orbital lesions is limited. Therefore, how to improve the signal-to-noise ratio and detection depth of 20MHz ophthalmic ultrasound images has become a difficult problem. [0003] In medical ultrasound diagnosis, digital coding excitation technology has important research significance for obtaining tiny signals of human tissue, improving image quality, and reducing the cavitation effect and the...

AI Technical Summary

Problems solved by technology

But its biggest drawback is that the Gray complementary sequence needs to be fired twice to complete the pulse compression, which greatly limits the frame rate of subsequent imaging.

Moreover, since there is currently no array-type ophthalmic sector scanning probe used in the frequency range above 10MHz, it is still necessary to use a mechanical transmission structure to control the single-array element transducer to achieve sector scanning of the eye, so it is impossible to choose to emit ultrasonic waves arbitrarily. The location and the number of times of sending ultrasonic waves, to overcome the limitation of imaging frame rate

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