Evaluation of 3D Monte Carlo-based scatter correction for 201Tl cardiac perfusion SPECT

Jianbin Xiao, Tim C. De Wit, Wojciech Zbijewski, Steven G. Staelens, Freek J. Beekman

Research output: Contribution to journalArticle

Abstract

201Tl-Chloride (201Tl) is a myocardial perfusion SPECT agent with excellent biochemical properties commonly used for assessing tissue viability. However, cardiac 201Tl SPECT images are severely degraded by photons scattered in the thorax. Accurate correction for this scatter is complicated by the nonuniform density and varied sizes of thoraxes, by the additional attenuation and scatter caused by female patients' breasts, and by the energy spectrum of 201Tl. Monte Carlo simulation is a general and accurate method well suited to modeling this scatter. Methods: Statistical reconstruction that includes Monte Carlo modeling of scatter was compared with statistical reconstruction algorithms not corrected for scatter. In the ADS method, corrections for attenuation, detector response, and scatter (Monte Carlo-based) were implemented simultaneously via the dual-matrix ordered-subset expectation maximization algorithm with a Monte Carlo simulator as part of the forward projector. The ADS method was compared with the A method (ordered-subset expectation maximization with attenuation correction) and with the AD method (a method like the A method but with detector response modeling added). A dual-head SPECT system equipped with two 153Gd scanning line sources was used for simultaneously acquiring transmission and emission data. Four clinically realistic phantom configurations (a large thorax and a small thorax, each with and without breasts) with a cardiac insert containing 2 cold defects were used to evaluate the proposed reconstruction algorithms. We compared the performance of the different algorithms in terms of noise properties, contrast-to-noise ratios, the contrast separability of perfusion defects, uniformity, and robustness to anatomic variations. Results: The ADS method provided images with clearly better visual defect contrast than did the other methods. The contrasts achieved with the ADS method were 10%-24% higher than those achieved with the AD method and 11%-37% higher than those achieved with the A method. For a typical contrast level, the ADS method exhibited noise levels around 27% lower than the AD method and 34% lower than the A method. Compared with the other 2 algorithms, the ADS reconstructions were less sensitive to anatomic variations and had better image uniformity in the homogeneously perfused myocardium. Finally, we found that the improvements that can be achieved with Monte Carlo-based scatter correction are stronger for 201Tl than for 99mTc imaging. Conclusion: Our results indicate that Monte Carlo-based scatter correction is suitable for 201Tl cardiac imaging and that such correction simultaneously improves several image-quality metrics.

Original languageEnglish (US)
Pages (from-to)637-644
Number of pages8
JournalJournal of Nuclear Medicine
Volume48
Issue number4
DOIs
StatePublished - Apr 1 2007
Externally publishedYes

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Single-Photon Emission-Computed Tomography
Perfusion
Anatomic Variation
Noise
Thorax
Breast
Tissue Survival
Photons
Chlorides
Myocardium

Keywords

  • Cardiac imaging
  • Monte-Carlo simulation
  • Quantitative SPECT
  • Scatter correction

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

Evaluation of 3D Monte Carlo-based scatter correction for 201Tl cardiac perfusion SPECT. / Xiao, Jianbin; De Wit, Tim C.; Zbijewski, Wojciech; Staelens, Steven G.; Beekman, Freek J.

In: Journal of Nuclear Medicine, Vol. 48, No. 4, 01.04.2007, p. 637-644.

Research output: Contribution to journalArticle

Xiao, Jianbin ; De Wit, Tim C. ; Zbijewski, Wojciech ; Staelens, Steven G. ; Beekman, Freek J. / Evaluation of 3D Monte Carlo-based scatter correction for 201Tl cardiac perfusion SPECT. In: Journal of Nuclear Medicine. 2007 ; Vol. 48, No. 4. pp. 637-644.
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N2 - 201Tl-Chloride (201Tl) is a myocardial perfusion SPECT agent with excellent biochemical properties commonly used for assessing tissue viability. However, cardiac 201Tl SPECT images are severely degraded by photons scattered in the thorax. Accurate correction for this scatter is complicated by the nonuniform density and varied sizes of thoraxes, by the additional attenuation and scatter caused by female patients' breasts, and by the energy spectrum of 201Tl. Monte Carlo simulation is a general and accurate method well suited to modeling this scatter. Methods: Statistical reconstruction that includes Monte Carlo modeling of scatter was compared with statistical reconstruction algorithms not corrected for scatter. In the ADS method, corrections for attenuation, detector response, and scatter (Monte Carlo-based) were implemented simultaneously via the dual-matrix ordered-subset expectation maximization algorithm with a Monte Carlo simulator as part of the forward projector. The ADS method was compared with the A method (ordered-subset expectation maximization with attenuation correction) and with the AD method (a method like the A method but with detector response modeling added). A dual-head SPECT system equipped with two 153Gd scanning line sources was used for simultaneously acquiring transmission and emission data. Four clinically realistic phantom configurations (a large thorax and a small thorax, each with and without breasts) with a cardiac insert containing 2 cold defects were used to evaluate the proposed reconstruction algorithms. We compared the performance of the different algorithms in terms of noise properties, contrast-to-noise ratios, the contrast separability of perfusion defects, uniformity, and robustness to anatomic variations. Results: The ADS method provided images with clearly better visual defect contrast than did the other methods. The contrasts achieved with the ADS method were 10%-24% higher than those achieved with the AD method and 11%-37% higher than those achieved with the A method. For a typical contrast level, the ADS method exhibited noise levels around 27% lower than the AD method and 34% lower than the A method. Compared with the other 2 algorithms, the ADS reconstructions were less sensitive to anatomic variations and had better image uniformity in the homogeneously perfused myocardium. Finally, we found that the improvements that can be achieved with Monte Carlo-based scatter correction are stronger for 201Tl than for 99mTc imaging. Conclusion: Our results indicate that Monte Carlo-based scatter correction is suitable for 201Tl cardiac imaging and that such correction simultaneously improves several image-quality metrics.

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