SYSTEMS AND METHODS FOR GENERATING X-RAY PHASE CONTRAST IMAGES USING A CONVENTIONAL X-RAY IMAGING SYSTEM

摘要

Described here are systems and methods for generating x-ray phase contrast images from conventional x-ray attenuation data. X-ray attenuation coefficients generated over a range of x-ray energies are used to compute the x-ray phase signal up to a calibration constant. This calibration constant is computed from provided calibration data, which may be obtained using a dedicated x-ray differential phase contrast imaging system to measure the decrement of the refractive index of a calibration phantom.

主权项

1. A method for producing an x-ray phase contrast image of an object from attenuation data acquired with an x-ray imaging system, the steps of the method comprising:
a) providing calibration data that includes a first calibration factor defining an energy dependence for a first component of x-ray attenuation and a second calibration factor defining an energy dependence for a second component of x-ray attenuation; b) acquiring attenuation data from the object using an x-ray imaging system, the attenuation data containing attenuation information associated with x-rays having at least two different energies; c) producing from the attenuation data, a first spatial map indicative of the first component of x-ray attenuation and a second spatial map indicative of the second component of x-ray attenuation; and d) producing an x-ray phase contrast image using the calibration data and the first and second spatial maps.