Key result
Novel double-pump dynamic cardiac phantom successfully simulates myocardial wall motions of ~8 to 11 mm.
Why the study?
The conventional dynamic cardiac phantom has a fixed outer membrane size and limited usefulness in technical evaluation due to only inner membrane movement.
Answers are grounded in this paper and cite their sources.
New phantom may refine technical validation of cardiac nuclear imaging; leaves open clinical translation and standardization.
UNLABELLED: The conventional dynamic cardiac phantom used in the field of nuclear medicine has a structure for which the size of the external side of the heart (the outer membrane substituting the myocardial layer) is fixed and only the inner side (the inner membrane substituting the ventricle part) moves anteroposteriorly. Therefore, its usefulness in technical evaluation is limited. Hence, we developed a new dynamic cardiac phantom in which the outer and inner membranes freely move. METHODS: Using a SPECT/CT system, we performed validation by filling the myocardial layer of the dynamic cardiac phantom with solution and the ventricle part with contrast medium. We evaluated myocardial wall motions of 3 segments (basal, mid, and apical) by setting the stroke ratios at 20:20 and 10:10 (ventricle-to-myocardial layer ratio). RESULTS: The myocardial wall motions (mean ± SD) at the stroke ratio of 20:20 were 7.50 ± 0.44, 11.15 ± 0.56, and 9.90 ± 0.24 mm in the basal, mid, and apical segments, respectively. The wall motions (mean ± SD) at the stroke ratio of 10:10 were 3.82 ± 0.43, 5.63 ± 0.39, and 4.53 ± 0.10 mm, respectively. CONCLUSION: In our dynamic cardiac phantom, different movements could be induced in the myocardial wall by freely changing the stroke ratio. These results suggest that the use of this phantom can realize technical evaluation that presumes various clinical conditions.
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Hara et al. (2016) studied Cardiac imaging phantom development. 2-Layer Double-Pump Dynamic Cardiac Phantom was evaluated on Myocardial wall motions of basal, mid, and apical segments. A newly developed 2-layer double-pump dynamic cardiac phantom successfully simulated myocardial wall motions ranging from 7.50 to 11.15 mm at a 20:20 stroke ratio.
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