The invention relates to an X ray detector arrangement (10) for X ray phase contrast tomo synthesis imaging a line detector (1) for X ray phase contrast tomo synthesis imaging an imaging system (24)for X ray phase contrast tomo synthesis imaging a method for X ray phase contrast tomo synthesis imaging and a computer program element for controlling such arrangement and a computer readable medium having stored such computer program element. The X ray detector arrangement (10)comprises several line detectors (1). Each line detector (1) is configured to detect a Moir pattern in at least a portion of an X ray beam (2) impacting such line detector (1). Each line detector (1)comprises several detector lines (11) wherein a width W of each line detector (1)equals one period or an integer multiple of the period of the Moir pattern.
