METHOD OF EXPERIMENTALLY DETERMINING A POINT SPREAD FUNCTION WHEN PROCESSING IMAGES FORMED USING PROTONIC RADIATION (VERSIONS) Russian patent published in 2019 - IPC G03B42/08 

FIELD: radiography.

SUBSTANCE: use: for proton radiography, in particular for processing optical images formed by proton radiation, and can be used, for example, in digital surveying systems to determine the internal structure of objects or study fast processes. Summary of invention consists in the fact that with according to the first version, the method includes obtaining an image of a PSF, which is caused by a recording system, simultaneously with an image of a PSF, which is caused by a geometrical displacement of protons, depending on the survey object, installation parameters and protective equipment. According to the second version, the method involves obtaining an image of a PSF caused by a recording system, regardless of the reception of an image of a PSF, which is caused by a geometric displacement of protons, depending on the object under study, installation parameters and protective equipment. In both versions, a proton beam is passed through a step test object or a set of test objects of different thickness, selected in accordance with the geometry of the survey object, wherein selection of thickness difference of test object is carried out depending on thickness or thicknesses of different areas of survey object and conditions of change of image blurring with drop of weight thickness within range of 5–30 g/cm². According to the first version, further, along the profiles built perpendicular to the step, the edge spread function, the line spread function, the full PSF or the set of full PSFs for different thicknesses are restored. In the second version, before determining the edge spread function, deconvolving the obtained digital image or the set of images of a PSF, caused by the recording system, and a full PSF or a set of full PSF for different thicknesses is obtained by convolving images of local PSF for each thickness with an image of a PSF caused by a recording system.

EFFECT: technical result is increase of reliability of information when producing PSF due to restoration of full PSF including both the first spread component associated with proton geometric displacement and the second connected with recording system.

2 cl, 4 dwg