Fig 1.
Setup of NEMA SPECT triple line source phantom.
Overview (a), and CT axial (b) and coronal (c) views of triple line source phantom.
Fig 2.
Acquired energy windows.
Table 1.
Overview of energy window widths and scatter correction factors for energy window scatter correction.
Fig 3.
Scatter fraction (a) and normalized mean-square error (b) of SPECT images after scatter correction in phantoms containing water or bone equivalent solution. DEW 5, 10, 15, 20, are dual energy window sub-windows of 5%, 10%, 15%, 20%; ESSE, effective scatter source estimation; non SC, no scatter correction; TEW 3, 5, 7, 10 are triple energy window sub-windows of 3%, 5%, 7%, 10%.
Fig 4.
Images of scattered radiation after scatter correction.
Increased red intensity indicates more residual scattered radiation. DEW, dual energy window; ESSE, effective scatter source estimation; SC, scatter correction; TEW, triple energy window.
Table 2.
Coefficients of variation at center of uniform cylinder phantom.