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Recognizing the surgical situs in minimally invasive hip arthroplasty: A comparison of different filtering techniques

Putzer D., Pizzini A., Liebensteiner M., Moctezuma J. L., Nogler M.

Biocybernetics and Biomedical Engineering

2016

Vol. 36, no. 1

182--192

Purpose: Detecting the soft tissue envelope and determining the work space available of the surgical situs during surgery is important for advanced instrument navigation techniques, wound care treatment, augmented reality, and instrument design. Different filtering techniques were evaluated to increase detectability of the soft tissue envelope. Methods: An algorithm was built for a time of flight (TOF) camera which recognizes the boarders of the soft tissue envelope. Different filtering techniques were tested on a dataset of eight surgical siti. Results: By using a median filter, a temporal filter and combining different input information provided by the time of flight camera by a logic operation the proposed algorithm was able to recognize the surgical situs in 73% of the images on average. Conclusions: The use of a TOF camera can introduce a new tool for recognizing the soft tissue envelope of a surgical approach.

Epileptic burst measurement using microelectrodes equipped on a cryogenic microprobe for minimally invasive brain surgery of intractable epilepsy treatment

Yamakawa T., Yamakawa T., Ishizuka S., Grigorievich Z. L., Suzuki M., Fujii M.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

76-79

A microprobing system, which has the functions of measuring the intracranial EEG(IC-EEG) and freezing brain tissue, is proposed for the minimally invasive brain cryogenic surgery of intractable epilepsy treatment. Two fi76 µm platinum electrodes were equipped on a fi0.8 mm cryogenic probe. Epileptic burst, which was evoked on a brain sample of a rat, was measured by the electrodes. The freezing function was confirmed with the experiments with sliced hippocampus samples of a rat.