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A data-driven respiratory motion correction for pediatric DMSA renal SPECT imaging: A simulation study.

Justin Pijanowski1,2, P Hendrik Pretorius1, W Paul Segars3

  • 1Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts, USA.

Medical Physics
|January 14, 2026
PubMed
Summary

This study developed a data-driven method to correct respiratory motion in pediatric Technetium-99m-dimercaptosuccinic acid (DMSA) renal SPECT imaging. The technique improved image quality, particularly for moderate motion, potentially enhancing diagnostic accuracy.

Keywords:
data‐driven methodologypediatricrenal SPECTrespiratory motion correction

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Pediatric Imaging

Background:

  • Technetium-99m-dimercaptosuccinic acid (DMSA) renal scintigraphy is crucial for evaluating pediatric urinary tract infections.
  • Pyelonephritis and scarring appear as defects on DMSA renal scintigraphy, including SPECT imaging.
  • Respiratory motion degrades SPECT image quality, necessitating motion correction.

Purpose of the Study:

  • Develop and evaluate a data-driven method for estimating respiratory motion signals.
  • Apply these signals to correct respiratory motion in pediatric DMSA renal SPECT imaging.
  • Improve diagnostic accuracy through enhanced image quality.

Main Methods:

  • Utilized XCAT phantom and SPECT Monte Carlo simulation for 100 ms projections.
  • Employed axial center-of-count-mass (aCOM) to estimate surrogate respiratory signals.
  • Reconstructed images across seven motion states and applied rigid-body registration for motion correction.

Main Results:

  • Achieved a Pearson's correlation coefficient (r) of 0.76 between estimated and true respiratory motion.
  • Demonstrated significant improvement in Normalized Root Mean Square Error (NRMSE) with motion correction for motion amplitudes >10 mm.
  • No significant difference in NRMSE for motion amplitudes between 6-10 mm.

Conclusions:

  • Data-driven respiratory motion correction enhances pediatric renal SPECT image quality.
  • The method shows potential for improved diagnostic accuracy in studies with moderate motion.
  • Further validation is recommended for clinical application.