Established standard techniques in diagnostic ultrasound imaging, such as B-mode, beamforming using delay-and-sum (DAS) and synthetic aperture (SA) techniques, are based on highly simplified physical models for the propagation of sound waves in biological materials. These simplifications can lead to undesirable image artifacts that make correct interpretation of ultrasound images much more difficult. Moreover, it is not clear which mechanical parameters of the investigated inhomogeneous biological material are imaged.

The Chair of Medical Engineering is therefore developing imaging methods that take into account the propagation, reflection and scattering of sound waves in biological materials as accurately as possible. Such methods are based on (linearized) wave equations for soft tissue (inhomogeneous fluids) or bone structures (inhomogeneous solids).

The term imaging in the context of the developed models means the graphical representation of the inhomogeneous material parameters considered therein. The latter are to be determined from measurements of the reflected and scattered sound waves. The solution of these so-called inverse problems is generally non-trivial and requires the application of advanced mathematical methods as well as complex algorithms.

Contact: Marvin Heller


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