access icon free Radar-based time-domain head imaging using database of effective dielectric constant

In radar-based time-domain head imaging, a priori information on the effective dielectric constants from the antennas’ perspective with respect to different head pixels is needed to map the significant scatterrers inside the head. A microwave-based head imaging technique, which utilises a model for the effective dielectric constant as a function of the antenna's position and imaged point inside the head, is presented. To build that model, a realistic MRI-derived numerical head surrounded by an array of wideband antennas is implemented in a full-wave electromagnetic solver. The time difference of arrival between transmission coefficients in free space and inside the head is calculated at different head pixels and used to evaluate the effective dielectric constant at those pixels. The model is validated on two different head phantoms and used to accurately detect different brain strokes.

Inspec keywords: phantoms; brain; microwave imaging; broadband antennas; diseases; permittivity; radar applications; antenna arrays; biomedical MRI

Other keywords: priori information; imaged point; wideband antenna array; transmission coefficient; head pixel; antenna perspective; microwave-based head imaging technique; brain stroke detection; free space; head phantoms; realistic MRI-derived numerical head; antenna position function; radar-based time-domain head imaging; significant scatterrer map; full-wave electromagnetic solver; effective dielectric constant database

Subjects: Microwaves and other electromagnetic waves (medical uses); Patient diagnostic methods and instrumentation; Medical magnetic resonance imaging and spectroscopy; Microwaves and other electromagnetic waves (biomedical imaging/measurement); Biomedical magnetic resonance imaging and spectroscopy; Antenna arrays; Biophysics of neurophysiological processes

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.1376
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