Transcranial low-frequency ultrasonic linear frequency-modulation pulse inversion micro-bubble imaging method

Abstract

The invention provides a transcranial low-frequency ultrasonic linear frequency-modulation pulse inversion micro-bubble imaging method. A special transcranial low-frequency ultrasonic linear array transducer transmits linear frequency-modulating linear scanning acoustic beams or wide wave beams opposite in phase; ultrasonic echo signals received by corresponding array elements are sampled and converted into radio frequency data; pulse compression is conducted on the radio frequency data, and two sets of radio frequency data undergoing the pulse compression and being opposite in phase are superposed; the superposed radio frequency data undergoes delayed correction and then undergoes compressive self-adapting wave beam forming; the signals obtained through wave beam forming sequentially undergo envelope detection and logarithm compression. The method utilizes low-frequency linear frequency-modulating signals and multi-angle composite imaging technology to jointly break through ultrasonicsignal blocking and shielding of the skull and achieves high-sensitivity ultrasonic imaging of encephalic tissues. The problem is solved that ultrasonic signals are severely attenuated after passingthe skull, so that transcranial ultrasonic detection depth is limited and the inside of the skull is difficult to detect and image.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection and ultrasonic imaging, and relates to low-frequency ultrasonic linear frequency modulation and multi-angle composite technology, in particular to a transcranial low-frequency ultrasonic linear scan mode chirp pulse reversal microbubble imaging method, and a single-angle or multi-angle transcranial low-frequency ultrasonic plane wave Angle Composite Chirp Reversal Microbubble Imaging Method. Background technique [0002] Ultrasound imaging uses ultrasound beams to scan the human body, and obtains images of internal organs by receiving and processing reflected signals. Ultrasound imaging is used to judge the location, size and shape of internal organs, determine the scope and physical properties of lesions, and provide anatomical maps of some glandular tissues, which has a wide range of application values. [0003] Although ultrasound can image and observe many human tissues and organ...

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Problems solved by technology

[0007] Considering the structural characteristics of the skull comprehensively, using low-frequency linear frequency-modulated ultrasonic signals to act on the skull to increase the penetration of ultrasonic waves, and combining multiple Angle compounding technology further improves the sensitivity to break through the barrier of the skull to ultrasonic signals and realize the study of ultrasonic imaging of intracranial tissues

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