Development of a Quality Assurance Phantom with Different Testing Materials for Microwave Imaging
N Alsbou1*, S Ahmad2, I Ali2, (1) Department of Engineering and Physics, University of Central Oklahoma, Edmond, OK, (2) University of Oklahoma Health Sciences Center, Oklahoma City, OK
Presentations
SU-H330-IePD-F8-2 (Sunday, 7/10/2022) 3:30 PM - 4:00 PM [Eastern Time (GMT-4)]
Exhibit Hall | Forum 8
Purpose: To develop a quality assurance phantom with different materials to test the performance of different microwave imaging systems and image quality parameters that include linearity, uniformity, spatial and contrast resolutions.
Methods: A quality assurance phantom was designed with different materials to test the image quality of microwave images. A solid water phantom block with uniform thickness was used to test the uniformity of microwave images. The Linearity of the microwave images was tested with different materials including air, lung, breast, adipose, muscle, liver and bone. The contrast resolution was tested with different volumes of water. The spatial resolution of the microwave images was tested with objects that are made from water and air gaps. The microwave images were acquired using a transmitter of a frequency 10.5GHz and wavelength of 2.85cm and multiple receivers that are mounted on a ring surrounding the testing objects. A back-projections algorithm was used to reconstruct the microwave images where interference and polarization effects are corrected.
Results: The microwave intensity decreased nearly linearly with increasing volume of water in the imaging field and different volumes of water were used to test the contrast of microwave images. It changed non-linearly with the density of different tissue equivalent materials which was used to test the linearity of microwave response. The microwave response was uniform within 5% over a flat slab of solid-water phantom. The spatial resolution was tested by measuring the variations in the microwave intensity of alternating solid water and air phantom objects in similar approach used to create line pairs used in x-ray imaging.
Conclusion: Different materials were tested for a quality assurance phantom which was developed which provides an important tool to test the image quality and control the performance of microwave imaging systems that has potential clinical application particularly in radiation therapy.
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