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CT-based attenuation correction and resolution compensation for I-123 IMP brain SPECT normal database: a multicenter phantom study

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Abstract

Objective

Statistical image analysis of brain SPECT images has improved diagnostic accuracy for brain disorders. However, the results of statistical analysis vary depending on the institution even when they use a common normal database (NDB), due to different intrinsic spatial resolutions or correction methods. The present study aimed to evaluate the correction of spatial resolution differences between equipment and examine the differences in skull bone attenuation to construct a common NDB for use in multicenter settings.

Methods

The proposed acquisition and processing protocols were those routinely used at each participating center with additional triple energy window (TEW) scatter correction (SC) and computed tomography (CT) based attenuation correction (CTAC). A multicenter phantom study was conducted on six imaging systems in five centers, with either single photon emission computed tomography (SPECT) or SPECT/CT, and two brain phantoms. The gray/white matter I-123 activity ratio in the brain phantoms was 4, and they were enclosed in either an artificial adult male skull, 1300 Hounsfield units (HU), a female skull, 850 HU, or an acrylic cover. The cut-off frequency of the Butterworth filters was adjusted so that the spatial resolution was unified to a 17.9 mm full width at half maximum (FWHM), that of the lowest resolution system. The gray-to-white matter count ratios were measured from SPECT images and compared with the actual activity ratio. In addition, mean, standard deviation and coefficient of variation images were calculated after normalization and anatomical standardization to evaluate the variability of the NDB.

Results

The gray-to-white matter count ratio error without SC and attenuation correction (AC) was significantly larger for higher bone densities (p < 0.05). The count ratio error with TEW and CTAC was approximately 5% regardless of bone density. After adjustment of the spatial resolution in the SPECT images, the variability of the NDB decreased and was comparable to that of the NDB without correction.

Conclusion

The proposed protocol showed potential for constructing an appropriate common NDB from SPECT images with SC, AC and spatial resolution compensation.

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Acknowledgements

This work was performed by the working group of Japanese Society of Nuclear Medicine (JSNM) in 2013–2015 and was supported partly by JSNM. No potential conflicts of interest were disclosed.

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Author notes

  1. Yoshitaka Inui and Takashi Ichihara contributed equally to this work.

Authors and Affiliations

  1. Department of Radiology, Fujita Health University School of Medicine, 1-98, Dengakugakubo, Kutsukake, Toyoake, Aichi, 470-1192, Japan

    Yoshitaka Inui & Hiroshi Toyama

  2. Faculty of Radiological Technology, Fujita Health University School of Health Sciences, 1-98, Dengakugakubo, Kutsukake, Toyoake, Aichi, 470-1192, Japan

    Takashi Ichihara

  3. Department of Radiology, Fujita Health University Hospital, 1-98, Dengakugakubo, Kutsukake, Toyoake, Aichi, 470-1192, Japan

    Masaki Uno & Masanobu Ishiguro

  4. Department of Clinical and Experimental Neuroimaging, National Center for Geriatrics and Gerontology, 7-430, Morioka, Obu, Aichi, 474-8511, Japan

    Kengo Ito

  5. Department of Radiological and Medical Laboratory Sciences, Graduate School of Medicine, Nagoya University, Furo, Chikusa, Nagoya, 464-8601, Japan

    Katsuhiko Kato

  6. Department of Radiology, Mie University School of Medicine, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan

    Hajime Sakuma

  7. Biomedical Imaging Research Center, University of Fukui, 23-3 Matsuoka-Shimoaizuki, Eiheij, Fukui, 910-1193, Japan

    Hidehiko Okazawa

Authors
  1. Yoshitaka Inui
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  2. Takashi Ichihara
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  3. Masaki Uno
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  4. Masanobu Ishiguro
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  5. Kengo Ito
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  6. Katsuhiko Kato
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  7. Hajime Sakuma
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  8. Hidehiko Okazawa
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  9. Hiroshi Toyama
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Corresponding author

Correspondence to Yoshitaka Inui.

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Inui, Y., Ichihara, T., Uno, M. et al. CT-based attenuation correction and resolution compensation for I-123 IMP brain SPECT normal database: a multicenter phantom study. Ann Nucl Med 32, 311–318 (2018). https://doi.org/10.1007/s12149-018-1248-x

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  • DOI: https://doi.org/10.1007/s12149-018-1248-x

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