The practical implementation and accuracy of dual window scatter correction in a neuro PET scanner with the septa retracted

A dual window scatter correction has been applied to a phantom and human data collected on a PET (positron emission tomography) scanner with the interplane septa retracted (3-D mode). The correction is a weighted subtraction of the lower energy window data from the upper energy window with correction parameters derived from simple phantom measurements. Dynamic ¹⁸F-FDG studies acquired routinely with the septa extended into the field of view (2-D mode) have been followed by a single 3-D frame, thus enabling a direct comparison of 2-D and 3-D reconstructed images in single subjects. The average count density in corresponding regions on scatter corrected and calibrated 2-D and 3-D images show close agreement