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Optimization of iterative reconstruction parameters with 3-dimensional resolution recovery, scatter and attenuation correction in 123I-FP-CIT SPECT

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Abstract

Objective

The aim of this study was to determine the optimal reconstruction parameters on ordered-subset expectation maximization iterative reconstruction with resolution recovery, scatter and attenuation correction (OSEMRRSCAC) on 123I-FP-CIT SPECT in terms of the image quality, quantification and diagnostic ability.

Methods

We evaluated the quality and quantification in 123I-FP-CIT SPECT images obtained by different reconstruction parameters using the anthropomorphic striatal phantom. The phantom images were acquired using a SPECT/CT system equipped with a low- and medium-energy general-purpose collimator and then were reconstructed using OSEMRRSCAC with various update numbers and the full width at half maximum (FWHM) of the Gaussian filter. The count ratio of the striatum, the coefficient of variation (CV) on the background and the specific binding ratio (SBR) were calculated to determine the optimal reconstruction parameters. Then, 42 consecutive patients who underwent 123I-FP-CIT SPECT were selected for clinical study. The patients were grouped into potentially decreasing group (20 with Parkinson’s disease, 5 with parkinsonian syndrome and 5 with dementia with Lewy bodies) and potentially normal binding group (4 with Alzheimer disease and 8 with essential tremor). Clinical images were reconstructed using OSEMRRSCAC and FBP with Chang’s AC (FBPAC). The performance of OSEMRRSCAC with the optimal reconstruction parameters was evaluated according to the receiver operating characteristic analysis and visual assessment.

Results

The count ratio increased with an increasing update number and converged uniformly with an update number over 90. The CV continuously increased with the update number. The SBR also increased with an increasing update number and converged uniformly with an update number of 90 or larger. The FWHM of the Gaussian filter influenced the image quality and quantification. In the clinical study, the area under curve (AUC) for the OSEMRRSCAC and FBPAC were 0.9812 and 0.9759, respectively. The quality of the SPECT images of OSEMRRSCAC (3.8 ± 0.8) was significantly superior to that of FBPAC (2.2 ± 0.7).

Conclusions

We determined that the optimal reconstruction parameter for OSEMRRSCAC was 90 update numbers with 6.6 mm FWHM of the Gaussian filter. Our results suggested that the optimal reconstruction parameters have a potential to improve the performance and the image quality of 123I-FP-CIT SPECT in comparison with the FBP reconstruction.

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Conflict of interest

Authors declare no conflict of interest in this study.

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Authors and Affiliations

  1. Department of Radiological Technology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki, Okayama, 710-8602, Japan

    Norikazu Matsutomo & Akio Nagaki

  2. Department of Neurology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki, Okayama, 710-8602, Japan

    Fusae Yamao

  3. Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan

    Norikazu Matsutomo & Masayuki Sasaki

Authors
  1. Norikazu Matsutomo
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  2. Akio Nagaki
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  3. Fusae Yamao
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  4. Masayuki Sasaki
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Correspondence to Norikazu Matsutomo.

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Matsutomo, N., Nagaki, A., Yamao, F. et al. Optimization of iterative reconstruction parameters with 3-dimensional resolution recovery, scatter and attenuation correction in 123I-FP-CIT SPECT. Ann Nucl Med 29, 636–642 (2015). https://doi.org/10.1007/s12149-015-0987-1

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  • DOI: https://doi.org/10.1007/s12149-015-0987-1

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