Gated SPET quantification of small hearts: Mathematical simulation and clinical application

Kenichi Nakajima, Junichi Taki, Takahiro Higuchi, Masaya Kawano, Masashi Taniguchi, Keiko Maruhashi, Shinobu Sakazume, Norihisa Tonami

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74 Citations (Scopus)

Abstract

Quantification of gated single-photon emission tomography (SPET) in small hearts has been considered to be inaccurate. To evaluate the validity of gated SPET in a small chamber volume, mathematical simulation and clinical application to paediatric patients were performed. Myocardium with various chamber sizes from 14 ml to 326 ml was generated assuming an arbitrary resolution (6.9-15.7 mm in full-width at half-maximum), noise and zooming factors. The cut-off frequency of the Butterworth filter for preprocessing was varied from 0.16 to 0.63 cycles/cm. The chamber volume was calculated by quantitative gated SPET software (QGS). The patients, aged 2 months to 19 years (n=27), were studied by gated technetium-99m methoxyisobutylisonitrile or tetrofosmin SPET. Image magnification as large as possible was performed during data acquisition to include the whole chest using 1.25-2.0 zooming. Based on the simulation study, an underestimation of the chamber volume occurred below a volume of 100 ml. The degree of underestimation for a 37-ml volume was 49% without zooming, but it improved to 3% with 2x zooming. Filters with a higher cut-off frequency, better system resolution and hardware zooming during acquisition improved quantitative accuracy in small hearts. For the subjects under 7 years old (n=7), quantification of volume and ejection fraction (EF) was possible in 72% of the patients. In those over 7 years old, gated SPET quantification was feasible in all cases. The correlation between gated SPET end-diastolic volume (SPET EDV) and both echocardiographic end-diastolic dimension (EDD) and echocardiographic EDV was good (r=0.84 between SPET EDV and echo EDD, r=0.85 between SPET EDV and echo EDV, P<0.0001 for both). The correlation between gated SPET EF and both echocardiographic fractional shortening (FS) and echocardiographic EF was fair (r=0.69 between SPET EF and echo FS, r=0.72 between SPET EF and echo EF, P<0.0001 for both). In conclusion, quantification of gated SPET of small hearts can be improved by means of a SPET filter with a high cut-off frequency, high system resolution and appropriate zooming. Gated SPET should be attempted not only in patients with small hearts but also in paediatric patients.

Original languageEnglish
Pages (from-to)1372-1379
Number of pages8
JournalEuropean Journal of Nuclear Medicine
Volume27
Issue number9
DOIs
Publication statusPublished - Sep 19 2000
Externally publishedYes

Keywords

  • Gated single
  • Myocardial perfusion
  • Paediatrics
  • Photon emission tomography
  • Simulation
  • Small heart

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Nakajima, K., Taki, J., Higuchi, T., Kawano, M., Taniguchi, M., Maruhashi, K., Sakazume, S., & Tonami, N. (2000). Gated SPET quantification of small hearts: Mathematical simulation and clinical application. European Journal of Nuclear Medicine, 27(9), 1372-1379. https://doi.org/10.1007/s002590000299