| 1. |
- DrAdda, Ilenia, et al.
(författare)
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A Statistical DOI Estimation Algorithm for a SiPM-Based Clinical SPECT Insert
- 2022
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Ingår i: IEEE Transactions on Radiation and Plasma Medical Sciences. - 2469-7311. ; 6:7, s. 771-777
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Tidskriftsartikel (refereegranskat)abstract
- A prototype clinical brain SPECT insert has been designed for use in simultaneous SPECT/MRI. The system utilises novel slit-slat collimators which, like pinhole collimators, suffers from parallax errors due to the large incident angle of photons. A statistical algorithm has been developed to determine the depth-of-interaction (DOI) with a view to improving image performance. The importance of DOI correction was demonstrated using Monte Carlo simulation. This simulation also indicated that 4 DOI layers (3×1.5 mm+3.5 mm) may be sufficient. The improvement in event localisation was demonstrated on a single detector before implementing the algorithm on the full clinical prototype where some limitations in event localisation in layers close to the readout plane were observed. Nevertheless DOI enabled the rejection of poorly localised events with improved resolution in reconstructed line sources.
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| 2. |
- Fan, Peng, et al.
(författare)
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Scatter and crosstalk corrections for (99m)Tc/(123)I dual-radionuclide imaging using a CZT SPECT system with pinhole collimators.
- 2015
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Ingår i: Medical Physics. - : Wiley. - 0094-2405 .- 2473-4209. ; 42:12, s. 6895-6911
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Tidskriftsartikel (refereegranskat)abstract
- The energy spectrum for a cadmium zinc telluride (CZT) detector has a low energy tail due to incomplete charge collection and intercrystal scattering. Due to these solid-state detector effects, scatter would be overestimated if the conventional triple-energy window (TEW) method is used for scatter and crosstalk corrections in CZT-based imaging systems. The objective of this work is to develop a scatter and crosstalk correction method for (99m)Tc/(123)I dual-radionuclide imaging for a CZT-based dedicated cardiac SPECT system with pinhole collimators (GE Discovery NM 530c/570c).
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| 3. |
- Morahan, Ashley J., et al.
(författare)
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Impact of DOI in a Clinical SPECT/MRI System : A Simulation Study
- 2020
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Ingår i: 2020 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2020. - 9781728176932
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Konferensbidrag (refereegranskat)abstract
- A novel SPECT/MRI scanner has been modelled and tested here using Monte Carlo simulation software, SIMIND. The INSERT SPECT/MRI system faces challenges with event reconstruction due to photon depth of interaction. The novel SPECT system is subject to parallax errors due to its crystal size and slit aperture collimator. We present a simple measure of the DOI errors through SIMIND experiments; by modelling the DOI layers we are able to improve the reconstruction of projection data in the INSERT scanner. A set of capillary phantoms are simulated to explore the impact of DOI on the resolution of the scanner and establish corrections in the system's reconstruction.
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