PHASE CONTRAST IMAGING METHOD AND APPARATUS

摘要

A phase contrast imaging method comprises: using a Terahertz radiation to radiate an object in order to interact with the object; making the Terahertz radiation after interacting with the object radiating a diffraction grating; shifting the diffraction grating along the diffraction grating wave vector direction in order to measure the light intensity distribution of the Terahertz radiation after interacting with the object and the grating in the diffraction field for the different grating positions; and recovering a phase contrast image of the object based on the light intensity distribution. Besides, a phase contrast imaging apparatus comprises: a Terahertz radiation emitter(1), which produces the Terahertz radiation to radiate an object in order to interact with the object; a diffraction grating(3), which is radiated by the Terahertz radiation after interacting with the object; a Terahertz radiation detector(4), which measures the light intensity distribution of the Terahertz radiation after interacting with the object and the grating in the diffraction field for the different grating positions; a data collecting and processing system(6), which recovers a phase contrast image of the object based on the light intensity distribution.