| 摘要 |
A hard X-ray grating phase-contrast imaging apparatus with large field-of-view, high contrast and low dose and the method thereof. The apparatus includes a source emitter (31), a source grating (G0), a beam splitting grating (G1), an analyzer grating (G2) and a detector (32). The source grating (G0), the beam splitting grating (G1), the analyzer grating (G2) and the detector (32) are orderly arranged in the transmission path of the source emitter (31). The period of the beam splitting grating (G1) is 30-50μm and the aspect ratio is not greater than 20. The apparatus can provide a high image contrast and a low radiation dose and realize a phase-contrast imaging with high energy and a large field-of-view by increasing the grating period, improving the duty ratio of the beam splitting grating (G1) and increasing the distance from an object to the analyzer grating (G2). The apparatus can also utilize the conventional polychromatic x-ray light source and available grating manufacture process, and be suitable for clinical use. |
