Dynamic computed tomography imaging

A method comprising:

• using projection data acquired during a CT examination of a periodically moving object to reconstruct a plurality of image layers, wherein the image layers are generated from a plurality of angularly displaced projection data segments;
• combining the image layers according to a first weighting function to generate first image data indicative of the object at a first motion phase;
• displaying a human readable image indicative of the first image data;
• combining the image layers according to a second weighting function so as to generate second image data indicative of the object at a second motion phase;
• generating a human readable image indicative of the object at the second motion phase;
• wherein the image layers are displaced by a first angular displacement and wherein the first and second motion phases are separated by an angular distance which is less than the first angular displacement.

A computer readable storage medium which carries instructions which, when executed by a computer, cause the computer to carry out a method comprising:

• using projection data acquired during a tomographic examination of a periodically moving object to generate a plurality of image layers;
• generating a first angularly varying reference weighting function;
• weighting the image layers so that the weighting applied to the image layers approximates the first weighting function;
• combining the weighted image layers to generate first volumetric data indicative of the object;
• generating a human readable image indicative of the first volumetric data.