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Registration of anatomical structures based on high frequency ultrasound data for intraoperative support

: Becker, M.
: Müller-Wittig, W.K.; Felger, W.

Darmstadt, 2001
Darmstadt, TU, Dipl.-Arb., 2001
Fraunhofer IGD ()
registration; ultrasound; medicine; augmented reality

In modern medicine, computer support becomes more and more important. Especially the combination of operation planing and the use of the planing results during an operation can help to optimize the work of surgeons.
To use the planing data intraoperatively, the virtual world, containing the planing information must be matched with the real situation in the operation room. This is the goal of the Registration process. It determines a transformation to project preoperative data onto the patient inside the operation room.
Actually this registration is done by fixing screws to the patient, which can be found within the CT dataset and measured mechanically during the operation. Affixing these screws efforts an additional operation and is an additional risk for the patient.
The goal of this work was the evaluation of an alternative approach for the registration, using an intraoperative ultrasoundsystem, which is able to measure anatomical landmarks. To realize this task, a suited matching algorithm is used. This algorithm works on the segmented object of the anatomical region on one hand and on contours of the same region, measured by an intraoperatively attached ultrasound device on the other hand. The matching algorithm will find the transformation, which projects the contours onto the surface of the anatomical region. This transformation is the registration.
In this diploma thesis a capable matching algorithm was founds and a system implementing this registration approach was developed and evaluated.