Attenuation correction, together with correction for effects such as scatter and camera blurring, is essential for obtaining highly quantitative SPECT images.
Figure 8a shows in red colour the discrepancy values selected to use in discrepancy correction together with the generated cubic spline showed in cyan colour.
Furthermore, for the baseline scan, the voxel-based TACs from dorsal caudate and globus pallidus shown on the sagittal slice are displayed before and after GIR motion correction together with the normalised population TACs for these ROIs.
In this study, we combine these two methods and propose three combined methods, namely flood error correction together with multi-model composition method (FEC MC), multi-model composition method together with flood error correction (MC FEC), and global real-time combination method (GRCM).
Figure 8 shows parametric VT images before and after motion correction, together with corresponding MRI images, for data sets with large movements.
Parametric VT images before and after motion correction, together with corresponding MRI images, for data sets with no or minor movements are shown in Fig. 9.
Those examining particular, rare adverse events (gastrointestinal bleeding, cardiovascular events) have tended to use exposure correction, together with independent blinded adjudication of the event [ 16, 25, 26].
Future work would involve further optimizing the motion compensation and topology correction algorithm, combining the topology correction together with non-uniform lateral scanning speed correction and probe optics optimization.
In this study involving advanced fluid flow codes, an incremental iterative formulation (also known as the "delta" or "correction" form), together with the well-known spatially split approximate factorization algorithm, is presented for solving the very large sparse systems of linear equations which are associated with aerodynamic sensitivity analysis.
A new flux continuous finite volume correction is presented together with an improved version of a previously proposed correction.
