X-ray single-pixel camera based on x-ray computational correlated imaging

Abstract

An X-ray single-pixel camera based on X-ray computational correlated imaging, which belongs to the technical research fields of X-ray computational correlated imaging and X-ray single-pixel imaging. The X-ray single-pixel camera includes: an X-ray modulation system (3), an X-ray modulation control system (4), an X-ray single-pixel detector (5), a main control system unit (6), a time synchronization system (7) and a computational imaging system (8). The main control system unit (6) controls each module through software; the time synchronization system (7) controls synchronization of each module for automatic collection; and the computational imaging system (8) is configured to perform a second-order correlated computation or a compressed sensing computation or a deep learning computation on the signals collected by the X-ray single-pixel detector (5) and a preset modulation matrix, so as to obtain an image of an object under test. The X-ray single-pixel camera based on X-ray computational correlated imaging, provided by the present invention, realizes single-pixel imaging, greatly reduces the sampling number while ensuring the imaging quality, and reduces the X-ray radiation dose in an imaging process.

Description

TECHNICAL FIELD[0001]The present invention relates to the technical research fields of X-ray computational correlated imaging and X-ray single-pixel imaging, and in particular, to an X-ray single-pixel camera based on X-ray computational correlated imaging.BACKGROUND ART[0002]As a light source with high penetrability, X-rays can quickly realize non-invasive imaging of samples. X-ray imaging, as a powerful imaging diagnostic technology, has been widely used in the fields of industry, medicine and basic scientific research. However, as a type of electromagnetic wave of short wavelength and high photon energy, X-rays can cause radiation damage when obtaining the internal structure of a sample. For example, in the field of medicine, the probability of cancerization of cells receiving too much radiation will greatly increase. Therefore, how to reduce the radiation dose of X-rays while ensuring the image quality is a problem that people are concerned about. In addition, a large-area array...

AI Technical Summary

Benefits of technology

The present invention provides an X-ray single-pixel camera based on X-ray computational correlated imaging. The camera uses a special measurement matrix to perform a controllable and known modulation on an original X-ray image under test, or projects the speckles modulated by the special measurement matrix on an object. The total light intensity received by the X-ray single-pixel detector together with the measurement matrix are subjected to an intensity correlation algorithm for image restoration, so that the requirements for imaging detectors can be greatly reduced in the case of obtaining the same resolution. Compared with a random measurement matrix, the special matrix can obtain an image with a higher contrast-to-noise ratio while the number of measurements is less, and can greatly reduce the number of measurements for an image with the same contrast-to-noise ratio, thereby reducing the radiation dose received by a sample.

Problems solved by technology

However, as a type of electromagnetic wave of short wavelength and high photon energy, X-rays can cause radiation damage when obtaining the internal structure of a sample.

Therefore, how to reduce the radiation dose of X-rays while ensuring the image quality is a problem that people are concerned about.

In addition, a large-area array high-pixel X-ray detector has a complex structure, and its high cost can bring certain economic pressure to the fields of industry, medicine and basic scientific research.

However, the wavelength of X-rays is too short, and there is no suitable spatial light modulation device to perform known and controllable modulation on the light field, and therefore, the currently reported experiments on X-ray ghost imaging all use randomly modulated pseudothermal light; not only is a large-area array X-ray detector required to pre-measure the modulated light field, but also a large number of exposure frames are required to restore the image of the object, and the imaging quality is poor.

Images