Dark field computed tomography imaging

An imaging system, comprising:

• a source that emits radiation at a focal spot that traverses an examination region;
• an interferometer that filters the emitted radiation for a dark-field imaging scan of an object;
• and
• a detector array that detects the filtered radiation traversing the examination region and produces a dark-field signal indicative thereof;
• and
• a reconstructor that weights the dark-field signal and reconstructs the weighted dark-field signal over 360 degrees using a cone beam reconstruction, generating volumetric image data,
• wherein the cone beam reconstruction does not require a complementary dark-field signal for the scanned object, which is a signal acquired one hundred and eighty degrees apart from the dark-field signal.

A computer readable storage medium encoded with computer readable instructions, which, when executed by a processor, cause the processor to:

• obtain a dark-field signal generated from at least a 360 degree dark-field CT scan of an object;
• weight the dark-field signal;
• and
• perform a cone beam reconstruction on the weighted dark-field signal over 360 degrees, thereby generating volumetric image data.