Minimal invasive Herzchirurgie - FZK

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■ Bildgebende Verfahren in der Diagnose des Mammakarzinoms 19
Imaging Techniques in the Diagnosis of Breast Cancer
T. Müller, R. Stotzka, H.-J. Neiber, W. Eppler, H. Gemmeke, HPE
Breast cancer is a frequent cause for death of women in the western world. Detection of
anomalies in early pathological stages and immediate treatment are essential for successful
cure. Early stages of breast cancer are indicated by the occurance of microcalcifications.
Their shape and spatial arrangement are of high diagnostic value. The process of
recognition and three-dimensional reconstruction of clustered microcalcifications requires a
good expert knowledge and a high abstract imagination capability. Therefore, it is useful to
detect calcifications automatically in mammograms and present their spatial relationship in
an animated 3D-model. This automatic process is done in a mammography workstation with
the objective not to replace a medical doctor but to provide a second expert opinion. This will
lead to a more reliable diagnosis.
■ Eine neue Methode zur nicht-invasiven Messung von elastischen Eigenschaften 27
lebenden Gewebes
A New Method for Non-invasive Measurement of Elastic Properties of Living Tissue
H. Maaß, U. Kühnapfel, IAI
A new approach is proposed based upon the theory that the velocity of sound waves
propagating in a material depends on the elasticity of the sample. In this study an
investigation is conducted to find out whether the respective engineering laws apply to the
mechanical and acoustic properties of biological living tissue. A model describing the
mechanical behaviour of biological tissue is developed taking non-linear mechanical tissue
properties into account. A method is proposed to determine the sound velocity noninvasively,
and a simulation of the propagation of ultrasonic waves in stratified materials was
performed.
■ Manipulator für die Therapie von Mammakarzinomen im 33
Magnetresonanztomographen (MRT)
Manipulator for the Therapy of Breast Cancer in the
Magnetic-Resonance-Tomography-Device (MRT)
H. Fischer, M. Selig, J. Vagner, IMB;
W. A. Kaiser, Institut für Diagnostische und Interventionelle Radiologie, Friedrich-Schiller-Universität Jena
A significant progress has been achieved in the diagnosis of small sized mamma
carcinomas by magnetic resonance mammography. Diagnosis and therapy in one turn using
the same machine would enhance precision and reduce cost of the intervention, minimizing
the patient’s strain and side effects. A manipulator with a biopsy unit will be presented allowing
the combination of diagnostic imaging with biopsy and subsequent therapy. Tests have
shown that a marked target could be reached reproducibly. It was placed within a pig liver in
the isocenter of a MRT running with a magnetic field of 1.5 T.