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A circular phased array and Doppler plane technology, applied in the direction of blood flow measurement devices, etc., can solve the problem of long depth of field and achieve the effects of improved resolution, reduced huge differences, and good consistency
Inactive Publication Date: 2014-02-05
SHENZHEN UNIV
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[0005] In order to solve the problem of the fixed focus of the existing TCD unit probe, the application of the present invention uses a planar ring-shaped phased array, and by sequentially delaying each array element during transmission or reception, the transmission focus or reception focus is realized, so that the focus is continuously adjustable , the ultrasonic beam can be narrowed effectively and controllably, the depth of field is long, the lateral resolution is comprehensively improved, and the signal-to-noise ratio is effectively improved
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[0025] The technical content described in the application of the present invention will be explained and illustrated in a non-restrictive manner below in conjunction with specific embodiments, in order to provide the public with a better understanding of the technical content.
[0026] like figure 1 As shown, the transcranial Doppler planar annular phased array probe described in the application of the present invention includes a piezoelectric vibrator 1, a metal shielding shell 2, an electronic tuning circuit 3, a coaxial cable 4, a housing 5, a backing 6, The matching layer 7 and the acoustic lens 8, wherein the piezoelectric vibrator 1 includes more than one array element ring distributed in a concentric circle, preferably 5 to 8 or more array element rings, and the piezoelectric vibrator includes piezoelectric ceramics , piezoelectric single crystal or piezoelectric composite materials. like Figure 2-a and 2-b As shown, each array element is controlled by independent ...
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Abstract
The invention provides a transcranial Doppler plane annular phased array probe, which comprises a piezoelectric vibrator, a metal shielding casing, an electronic tuning circuit, a coaxial cable, a case, a back lining, a matching layer and an acoustic lens, wherein the piezoelectric vibrator comprises more than one array element ring in annular distribution to form concentric circles, each array element ring adopts independent lead wire control, the areas of all array elements are identical, in addition, the path differences of all array elements are identical, each independent array element is excited by adopting specific time delay, and the dynamic focusing in the spreading direction of ultrasonic beams can be achieved. The plane annular phased array is utilized, each array element is respectively subjected to time delay during the emitting or receiving, and the emitting focusing or the receiving focusing is realized, so focal points can be continuously adjusted, the ultrasonic beams can be effectively and controllably narrowed, the depth of field is long, the transcranial Doppler plane annular phased array probe has the advantages of variable aperture, variable focal point, variable trace and the like, the lateral resolution ratio of a system can be comprehensively improved, and the signal to noise ratio is effectively improved.
Description
technical field [0001] The application of the present invention relates to a transcranial Doppler (TCD, Transcranial Doppler) probe structure with adjustable focal length, in particular to a planar multi-channel array probe used in a transcranial Doppler imaging system, which has excellent The invention has directivity and continuously adjustable focal length, and belongs to the technical field of medical diagnostic ultrasound systems. Background technique [0002] Transcranial Doppler (TCD) is a non-invasive method for evaluating the hemodynamics of skull base arteries with spectral Doppler. TCD examination is suitable for cerebrovascular malformation, cerebral vasospasm, increased intracranial pressure, cerebral artery stenosis and occlusion, internal carotid artery stenosis and occlusion, migraine, vertebral artery-basilar artery insufficiency, confirmation of brain death, and monitoring during and after surgery Cerebral artery, subclavian artery steal syndrome, etc., ha...
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