ArticleMedical physics2026
Development of an adjustable dynamic phantom for testing deviceless motion correction algorithm in PET.
Article in Medical physics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundRespiratory motion during PET Imaging leads to blurring, volumetric overestimation, and reduced quantitative accuracy. Deviceless motion correction algorithms (MCA) such as OncoFreeze (OF) by Siemens Healthineers (Forchheim, Germany) extract respiratory waveforms from list-mode data but require validation that cannot be obtained in vivo. PURPOSE: To develop and validate an adjustable dynamic phantom with fillable spheres for quantitative assessment of deviceless PET motion correction.
methodsA microprocessor-controlled two-axis phantom was constructed to generate linear craniocaudal (cc), ventrodorsal (vd), and diagonal (diag) motion with amplitudes of 0-40 mm and frequencies of 10-40 min
resultsWithout correction, motion produced substantial overestimation of apparent volume: +15%-55% (4 mL), +81%-166% (1 mL) and +276%-509% (0.25 mL), depending on trajectory and IC
conclusionsThe phantom provides a reproducible ground-truth framework for evaluating deviceless PET motion correction. MCA reduces motion-induced blurring and volumetric inflation, though correction remains size- and direction-dependent. The system enables systematic benchmarking and further optimization of motion-correction algorithms.
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