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Correction of scattered photons in Tc-99m imaging by means of a photopeak dual-energy window acquisition

Annals of Nuclear Medicine volume 6, Article number: 153 (1992) Cite this article

Abstract

We are proposing a new method for correcting of scattered photons in technetium-99m (99mTc) imaging by means of photopeak dual-energy window acquisition. This method consists of the simultaneous acquisition of two images and estimation of a scatter image included in the symmetric energy window (SW) image by the difference between these images. The scatter corrected image is obtained by subtracting the scatter image from the SW image. In order to evaluate this method, we imaged a planar and a SPECT phantom with cold lesions and calculated the contrast value with and without the scatter correction. In addition, we performed asymmetric energy window (ASW) imaging to compare with this scatter correction method for planar images. In the planar image with the tissue-equivalent material of 10 cm, the scatter correction method removed 32% of the counting rate of the SW image and improved from 0.81 to 0.94 of the contrast value for a 4 cm-diameter cold lesion, while the contrast value with the ASW was 0.87 for such a cold lesion. The scatter corrected SPECT image had a reduction of 18% of the counting rate of the SW SPECT image and improvement of ∼11% in contrast for cold spot sizes larger than a 3 cm-diameter, compared with the SW SPECT image. In addition, a perfusion defect could be well visualized by this scatter correction method on99mTc-HMPAO regional cerebral blood flow SPECT of a patient. Our proposed scatter correction method can improve both planar and SPECT images qualitatively and quantitatively.

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References

  1. Filipow LJ, Macey DJ, Munro TR: The measurement of the depth of a point source of a radioisotope from gamma ray spectra.Phys Med Biol 24: 341–352, 1979

    Article  CAS  PubMed  Google Scholar 

  2. Macey DJ, DeNardo GL, DeNardo SJ: Comparison of three boundary detection methods for SPECT using Compton scattered photons.J Nucl Med 29: 203–207, 1988

    CAS  PubMed  Google Scholar 

  3. Heller SL, Goodwin PN: SPECT instrumentation: performance, lesion detection, and recent innovations.Semin Nucl Med 17: 184–199, 1987

    Article  CAS  PubMed  Google Scholar 

  4. Bloch P, Sanders T: Reduction of the effects of scattered radiation on a sodium iodide imaging system.J Nucl Med 14: 67–72, 1973

    CAS  PubMed  Google Scholar 

  5. Jaszczak RJ, Greer KL, Floyd CE, et al: Improved SPECT quantification using compensation for scattered photons.J Nucl Med 25: 893–900, 1984

    CAS  PubMed  Google Scholar 

  6. Gilardi MC, Bettinardi V, Todd-Pokropek A, et al: Assessment and comparison of three scatter correction techniques in single photon emission computed tomography.J Nucl Med 29: 1971–1979, 1988

    CAS  PubMed  Google Scholar 

  7. Mas J, Ben Younes R, Bidet R: Improvement of quantification in SPECT studies by scatter and attenuation compensation.Eur J Nucl Med 15: 351–356, 1989

    Article  CAS  PubMed  Google Scholar 

  8. Koral KF, Swailem FM, Buchbinder S, et al: SPECT dual-energy-window Compton correction: scatter multiplier required for quantification.J Nucl Med 31: 90–98, 1990

    CAS  PubMed  Google Scholar 

  9. Halama JR, Henkin RE, Friend LE: Gamma camera radionuclide images: improved contrast with energy-weighted acquisition.Radiology 169: 533–538, 1988

    CAS  PubMed  Google Scholar 

  10. Floyd CE, Jaszczak RJ, Harris CC, et al: Energy and spatial distribution of multiple order Compton scatter in SPECT: a Monte Carlo investigation.Phys Med Biol 29: 1217–1230, 1984

    Article  CAS  PubMed  Google Scholar 

  11. Rosenthal MS, Henry LJ: Scattering in uniform media.Phys Med Biol 35: 265–274, 1990

    Article  Google Scholar 

  12. Ogawa K, Harata Y, Ichihara T, et al: Estimation of scatter component in SPECT planar image using a Monte Carlo method.Jpn J Nucl Med 27: 467–476,. 1990

    CAS  Google Scholar 

  13. Kojima A, Matsumoto M, Takahashi M: Experi- mental analysis of scattered photons in a99mTc imaging with a gamma camera.Ann Nucl Med 5: 139–144, 1991

    Article  CAS  PubMed  Google Scholar 

  14. Axelsson B, Msaki P, Israelsson A: Subtraction of Compton-scattered photons in single-photon emission computerized tomography.J Nucl Med 25: 490–494, 1984

    CAS  PubMed  Google Scholar 

  15. Floyd CE, Jaszczak RJ, Greer KL, et al: Deconvolution of Compton scatter in SPECT.J Nucl Med 26: 403–408, 1985

    PubMed  Google Scholar 

  16. Kojima A, Matsumoto M, Takahashi M, et al: Effect of spatial resolution on SPECT quantification values.J Nucl Med 30: 508–514, 1989

    CAS  PubMed  Google Scholar 

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Affiliations

  1. Department of Radiology, Kumamoto University School of Medicine, 1-1-1, Honjo, 860, Kumamoto, Japan

    Akihiro Kojima, Akinori Tsuji, Yoshikazu Takaki, Seiji Tomiguchi, Masafumi Hara & Mutsumasa Takahashi

  2. Department of Radiological Technology, College of Medical Science, Kumamoto University, Japan

    Masanori Matsumoto

Authors
  1. Akihiro Kojima
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  2. Akinori Tsuji
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  3. Yoshikazu Takaki
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  4. Seiji Tomiguchi
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  5. Masafumi Hara
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  6. Masanori Matsumoto
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  7. Mutsumasa Takahashi
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Kojima, A., Tsuji, A., Takaki, Y. et al. Correction of scattered photons in Tc-99m imaging by means of a photopeak dual-energy window acquisition. Ann Nucl Med 6, 153 (1992). https://doi.org/10.1007/BF03178307

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  • DOI: https://doi.org/10.1007/BF03178307

Key words

  • Compton scatter correction
  • photopeak dual-energy window acquisition
  • scatter image