Noise analysis of grating-based x-ray differential phase contrast imaging

作者：Revol Vincent^*; Kottler Christian; Kaufmann Rolf; Straumann Ulrich; Urban Claus

来源：Review of Scientific Instruments, 2010, 81(7): 073709.

DOI：10.1063/1.3465334

The sensitivity of x-ray radiographic images, meaning the minimal detectable change in the thickness or in the index of refraction of a sample, is directly related to the uncertainty of the measurement method. In the following work, we report on the recent development of quantitative descriptions for the stochastic error of grating-based differential phase contrast imaging (DPCi). Our model includes the noise transfer characteristics of the x-ray detector and the jitter of the phase steps. We find that the noise in DPCi depends strongly on the phase stepping visibility and the sample properties. The results are supported by experimental evidence acquired with our new instrument with a field of view of 50 X 70 mm(2). Our conclusions provide general guidelines to optimize grating interferometers for specific applications and problems.

• 出版日期2010-7