Opto-acoustic tomography reconstruction method based on frequency domain and wave number field

Abstract

The invention discloses an opto-acoustic tomography reconstruction method based on a frequency domain and a wave number field. The method comprises the following steps: acquiring radio frequency dataand system parameters, performing time gain compensation, performing three-dimensional Fourier transform, performing interpolation processing, performing three-dimensional Fourier transform, performing demodulation to obtain envelope, adjusting a contrast ratio, outputting opto-acoustic images, and optimizing the opto-acoustic images. By adopting the method, three-dimensional reconstruction on opto-acoustic signals is implemented in a frequency domain and a wave number field, the influence that signals are not completely acquired in a limited angle can be reduced, and meanwhile, the influenceof nonuniformity of sound velocities is taken into account. The reconstruction method disclosed by the invention has the advantages of being high in reconstruction image resolution, high in signal tonoise ratio, small in fake shadow and rapid in reconstruction calculation speed.

Description

technical field [0001] The invention belongs to an imaging reconstruction method, in particular to a photoacoustic tomography reconstruction method. Background technique [0002] Photoacoustic imaging is an emerging imaging technique that offers potential perspectives and opportunities for clinical imaging. Photoacoustic tomography is an important branch of photoacoustic imaging. Its advantage lies in its deep imaging depth, which can reach several centimeters, which meets the basic needs of clinical imaging. At present, photoacoustic tomography based on annular array acoustic transducers (full-angle detection) has been used for mammary gland inspection. clinical examination. Acoustic transducers based on handheld (limited-angle detection) have the advantages of being flexible and portable, and at the same time, they are easy to combine with ultrasound imaging commonly used in clinical practice, which is the development trend of photoacoustic tomography. The most notable ...

AI Technical Summary

Problems solved by technology

The most notable feature of photoacoustic tomography that is different from other photoacoustic imaging technologies is that photoacoustic tomography needs to reconstruct the collected radio frequency data to obtain a photoacoustic image. Currently, commonly used reconstruction methods include time inversion method and filtered back projection method. , these two methods have good effects on photoacoustic tomography with full-angle detection; however, for hand-held acoustic transducers, it is difficult for the above two methods to achieve accurate reconstruction imaging because only limited-angle signals are collected.

On the other hand, the 2D matrix acoustic transducer is an emerging handheld acoustic transducer that can directly perform 3D imaging, and there is currently no method that can reconstruct the 2D matrix acoustic transducer

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