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Item type:Publication, Access status: with files , Towards contactless optical coherence elastography with acoustic tissue excitation(De Gruyter, 2015-09-15); ; ; ; Elastography presents an interesting approach to complement image data with mechanical tissue properties. Typically, the tissue is excited by direct contact to a probe. We study contactless elastography based on optical coherence tomography (OCT) and dynamic acoustic tissue excitation with airborne sound. We illustrate the principle and an implementation using sound waves of 135 Hz to excite the tissue. The displacement is measured and results of several tests indicate the feasibility to obtain a qualitative measure of the mechanical tissue properties. The approach is interesting for optical palpation, e.g., to enhance navigation and tissue characterization in minimally invasive and robot-assisted surgery.Publicationtype: Journal Article96 154 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A concept for fail safe robotic needle insertion in soft tissue(2015-03); ; ; This paper presents a concept of automatic needle placement for brachytherapy. For the success of this minimally invasive treatment, a precise and safe placement of needles inside soft tissue is fundamental. The presented concept incorporates information about the needle as well as the tissue to find a suitable needle trajectory. A patient-specific tissue model is derived from different imaging modalities and updated during the insertion. Essential for this concept is that during the robotic placement of the needle, it is continuously verified if proceeding is safe.Publicationtype: Conference Paper121