One-dimensional non-focused and focused ultrasound dual-array scanning imaging device and method

Abstract

The invention discloses a one-dimensional non-focused and focused ultrasonic double array scanning imaging device and method. The relative positions of a non-focused ultrasonic transducer linear array and an ultrasonic array are fixed and arranged front to back side by side; laser stimulates to-be-tested tissue to generate a photoacoustic signal, the non-focused ultrasonic transducer linear array collects the photoacoustic signal and ultrasonic imaging is carried out on the ultrasonic array at an interval of a laser pulse; the one-dimensional non-focused ultrasonic transducer linear array is scanned and is equivalent to a two-dimensional photoacoustic detection area array, so that the one-dimensional non-focused ultrasonic transducer linear array has a wider receiving angle than a focused linear array; meanwhile, the design and processing difficulty is greatly reduced in comparison with a two-dimensional surface, and the one-dimensional non-focused ultrasonic transducer linear array has great value in animal and photoacoustic tomographic imaging; the image contrast sources of two modes are different and information is complementary, a photoacoustic image and an ultrasonic image are registered and rebuilt to obtain a double-mode three-dimensional imaging result, and can be applied to small animal imaging or tumor disease examination and post-treatment evaluation of a breast cancer and the like.

Description

technical field [0001] The invention relates to an imaging method applied to animals and clinics, in particular to a dual-array scanning imaging device based on one-dimensional non-focused and focused ultrasound and an imaging method thereof. Background technique [0002] Photoacoustic tomography (Photoacoustic tomography, PAT, sometimes referred to as photoacoustic imaging) technology is a method of imaging optical absorbers in tissues by using the effect of ultrasound emitted by tissues after absorbing pulsed laser light. Photoacoustic tomography is a hybrid imaging modality that combines rich optical contrast and high-resolution ultrasound, breaking through the barrier of strong light scattering caused by purely high-resolution optical imaging of tissue, while being different from pure ultrasound imaging , the tissue's ability to absorb photons reflects the molecular composition of the tissue and its function. The fusion of photoacoustic tomography and ultrasound imaging...

AI Technical Summary

Problems solved by technology

Since the two-dimensional area array needs to contain many ultrasonic transducer elements and amplification and acquisition circuits, which greatly increases the complexity and cost of the system, there is a lack of large-area two-dimensional area arrays for photoacoustic imaging.

The focused one-dimensional line array can only receive photoacoustic signals in biological tissues within a limited angle, which is not accurate enough for the reconstruction of photoacoustic three-dimensional images.

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