PHASE RETRIEVAL FOR SCANNING DIFFERENTIAL PHASE CONTRAST SYSTEMS Russian patent published in 2019 - IPC A61B6/00 G02B7/00 G21K1/04 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medical equipment, specifically to phase contrast radiography means. Phase contrast radiography system (MA) of the scanning type, comprises a pedestal (PD), an arm (AR) movable relative to the pedestal, interferometer unit in the mount (GM) in or on the arm, which includes one or more gratings (G0, G1, G2), x-ray source (XR), detector (D) mounted in or on the arm, movable during scanning motion to receive radiation after interacting with the interferometer gratings to produce a drifting Moire intensity pattern detected by the detector across a sequence of readings during use of the device, a rigidizer (RGD) operable to apply a force upon the arm and/or the interferometer mounting to vary prior or during said scanning motion the rigidity thereof so as to impart a relative motion between the at least two gratings, thereby affording the ability to vary the local fringe phase of said Moire pattern. Method for processing data output by a scanning-type phase-contrast radiographic device comprises the steps of receiving a read sequence of detector (S610), which together record a drifting Moire pattern, wherein the readings are detected by a plurality of pixels of the detector of said device during the control scan operation, wherein the drift is caused by the relative movement of at least two interferometer gratings during the scanning operation, approximating (S615) readings to the function f of the signal measurement models, finding for calibration parameter values that include multiple phases (ϕ_l) of the drifting Moire pattern and / or at least one of: i) intensity (A_i) for each pixel or ii) visibility (V_i) for each pixel, and adjusting (S605) the rigidity of the arm and / or the mounting of the interferometer by applying force to the mounting of the interferometer or to the arm having the mounting of the interferometer, so as to control the magnitude of the drift of the Moire pattern. Machine-readable media is designed to implement the method of data processing.

EFFECT: use of inventions allows to simplify procedural calibration.

13 cl, 6 dwg