Detector head position correction for hybrid SPECT/CT imaging apparatus

A method of correcting a SPECT projection image of an object obtained by a nuclear medical imaging apparatus to provide for accurate registration of said SPECT projection image with a three-dimensional CT image of the same object, comprising the steps of:

• storing a set of detector head position correction parameters for each of a plurality of predetermined image view angles;
• retrieving detector head position correction parameters corresponding to a specific view angle of said SPECT projection image, with respect to said CT image;
• adjusting a position of a detector head of said nuclear medical imaging apparatus in accordance with retrieved detector head position correction parameters;
• calculating view angle-dependent linearity correction coefficients in accordance with a retrieved detector head position correction parameter;
• acquiring SPECT projection image counts from said object with said detector head positioned at said adjusted position;
• and
• framing resulting SPECT projection image data in accordance with said view angle-dependent linearity correction coefficients.