Development of a 2-Layer Double-Pump Dynamic Cardiac Phantom

Area of Science:

• Nuclear Medicine
• Medical Imaging
• Biomedical Engineering

Background:

• Conventional dynamic cardiac phantoms have limitations due to fixed outer dimensions.
• This restricts their utility in comprehensive technical evaluations for nuclear medicine applications.

Purpose of the Study:

• To develop and validate a new dynamic cardiac phantom with independently moving outer and inner membranes.
• To assess the phantom's capability in simulating various cardiac dynamic conditions.

Main Methods:

• A novel dynamic cardiac phantom was developed with freely moving outer (myocardial layer) and inner (ventricle) membranes.
• SPECT/CT imaging was used to validate the phantom, filling the myocardial layer with solution and the ventricle with contrast medium.
• Myocardial wall motion was evaluated across basal, mid, and apical segments at stroke ratios of 20:20 and 10:10.

Main Results:

• At a 20:20 stroke ratio, myocardial wall motions were 7.50 ± 0.44 mm (basal), 11.15 ± 0.56 mm (mid), and 9.90 ± 0.24 mm (apical).
• At a 10:10 stroke ratio, wall motions measured 3.82 ± 0.43 mm (basal), 5.63 ± 0.39 mm (mid), and 4.53 ± 0.10 mm (apical).
• The phantom demonstrated the ability to induce varied myocardial wall movements by adjusting the stroke ratio.

Conclusions:

• The developed dynamic cardiac phantom allows for induced, variable movements in the myocardial wall.
• This phantom facilitates technical evaluations that can simulate a wider range of clinical conditions in nuclear medicine.
• The findings support the phantom's potential for enhancing the technical assessment of cardiac imaging procedures.