Single Photon Scatter Compensation By Photopeak Energy Distribution Analysis

Logan, K.W.; McFarland, William D.

doi:10.1109/nssmic.1990.693528

Cited by 1 publication

(2 citation statements)

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“…The asymmetric photopeak windows technique [71] splits the standard photopeak window into two asymmetric windows. The energy range of the two windows is chosen such that the number of scattered counts in each window is the same.…”

Section: Reconstruction Filtersmentioning

confidence: 99%

“…As unscattered photons are distributed more symmetrically in the photopeak window than are scattered photons, subtracting one of the asymmetric windows fiom the other results in scatter free data. The problerns with this approach are that the subtraction also reduces the number of unscattered photons (by 20% in [71]) and that the technique is quite sensitive to the position of the line dividing the two windows and hence quite susceptible to electronic drift in the camera.…”

Section: Reconstruction Filtersmentioning

confidence: 99%

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Analytical calculation of photon distributions in SPECT projections

Wells

Celler

Harrop

1998

IEEE Trans. Nucl. Sci.

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In this work is presented a method for analytically cdculating the distribution of photons detected in SPECT projections. The technique is appLicabIe to sources in homogeneous and non-homogeneous media. The photon distribution (primary, first and second order Compton scatter, and first order Rayleigh scatter) is computed using precdculated camera-dependent lookup tables in conjunction with an attenuation map of the scattering object aad a map of the activity distribution.The resdts of the technique are in excellent agreement with those of Monte Carlo simulation and experimental phantom studies. It has b e n validated with respect to sources in both homogeneous and noa-homogeneous media.Compared with a similar andyticd technique, it offers a factor of 40-60 decrease in the cdculation time for higher order Compton scatter distributions. For small sources, it improves on computation tirne required by Monte Carlo simulators by a factor of 20-150.Finally, this method has been applied to the problem of correcting for cross-taik in 1231-99mT~ dual-isotope SPECT studies. It has demonstrated the ability to accurately reproduce the shape of the cross-talk distribution and to reproduce the absolute activity of the sources to within 7%, dowing accurate removai of cross-talk contamination. Abstract. . 11

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Section: Reconstruction Filtersmentioning

confidence: 99%

Section: Reconstruction Filtersmentioning

confidence: 99%