These results indicate that effective improvement of image quality can be expected with interpolation. Thus, image quality and the ability to depict images can be improved while maintaining the present acquisition time and image quality. In addition, this can be achieved more effectively than at present even if the acquisition time is reduced.
The interpolated projection data estimation processing (IPDE) method increases the amount of projection data by interpolation of the projection data. We examined the usefulness of the IPDE method for 201 Tl myocardial perfusion imaging (MPI) single photon emission computed tomography (SPECT) with a short acquisition time.
MethodsForty patients with suspected ischemic heart disease underwent stress 201 Tl-MPI SPECT.Both stress and delayed images were acquired by 4 cycles of 360° continuous rotation with a 90-direction setting for 14 min. The projection data used for reconstruction were 1) all cycle data (Tl-90-14min), 2) 2 cycles of data (Tl-90-7min), and 3) 2 cycles of data processed using the IPDE method (Tl-180IPDE-7min). This study compared the detection of the perfusion defect by the uptake score and the image quality of 201 Tl-MPI SPECT using the normalized mean square error (NMSE).
ResultsThe uptake score of Tl-180IPDE-7min was significantly more concordant with Tl-90-14min in comparison to the Tl-90-7min (p<0.05). The NMSE of the Tl-180IPDE-7 min (1.85±1.06%) was significantly lower than that of the Tl-90-7min be useful as a supporting method for shortening the acquisition time of 201 Tl-MPI SPECT.
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