Dr. Motaz Alshaher Profile

Dr. Motaz Alshaher

Internal Medicine/Cardiology

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Proceedings Article | 29 March 2013 Paper

A multimodal (MRI/ultrasound) cardiac phantom for imaging experiments

Vahid Tavakoli, Michael Kendrick, Mostafa Shakeri, Motaz Alshaher, Marcus Stoddard, Amir Amini

Proceedings Volume 8672, 867202 (2013) https://doi.org/10.1117/12.2008783

KEYWORDS: Heart, Ultrasonography, Tissues, Magnetic resonance imaging, Polymers, Echocardiography, Image segmentation, Connectors, Motion models, Manufacturing

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A dynamic cardiac phantom can play a significant role in the evaluation and development of ultrasound and cardiac magnetic resonance (MR) motion tracking and registration methods. A four chamber multimodal cardiac phantom has been designed and built to simulate normal and pathologic hearts with different degrees of “infarction” and “scar tissues”. In this set up, cardiac valves have been designed and modeled as well. The four-chamber structure can simulate the asymmetric ventricular, atrial and valve motions. Poly Vinyl Alcohol (PVA) is used as the principal material since it can simulate the shape, elasticity, and MR and ultrasound properties of the heart. The cardiac shape is simulated using a four-chamber mold made of polymer clay. An additional pathologic heart phantom containing stiff inclusions has been manufactured in order to simulate an infracted heart. The stiff inclusions are of different shapes and different degrees of elasticity and are able to simulate abnormal cardiac segments. The cardiac elasticity is adjusted based on freeze-thaw cycles of the PVA cryogel for normal and scarred regions. Ultrasound and MRI markers were inserted in the cardiac phantom as landmarks for validations. To the best of our knowledge, this is the first multimodal phantom that models a dynamic four-chamber human heart including the cardiac valve.

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