A real-time artifact reduction algorithm based on precise threshold during short-separation optical probe insertion in neurosurgery

Abstract

During neurosurgery, an optical probe has been used to guide the micro-electrode, which is punctured into the globus pallidus (GP) to create a lesion that can relieve the cardinal symptoms. Accurate target localization is the key factor to a®ect the treatment. However, considering the scattering nature of the tissue, the \look ahead distance (LAD)" of optical probe makes the boundary between the di®erent tissues blurred and di±cult to be distinguished, which is de¯ned as artifact. Thus, it is highly desirable to reduce the artifact caused by LAD. In this paper, a real-time algorithm based on precise threshold was proposed to eliminate the artifact. The value of the threshold was determined by the maximum error of the measurement system during the calibration procession automatically. Then, the measured data was processed sequentially only based on the threshold and the former data. Moreover, 100 m double-¯ber probe and two-layer and multi-layer phantom models were utilized to validate the precision of the algorithm. The error of the algorithm is one puncture step, which was proved in the theory and experiment. It was concluded that the present method could reduce the artifact caused by LAD and make the real boundary sharper and less blurred in real-time. It might be potentially used for the neurosurgery navigation.

Microwave Ablation Efficacy Evaluation of Bone Tissue Based on Near Infrared Spectrum

“…It can realize non-destructive analysis and in vivo real-time monitoring, which can be used for non-destructive or minimally invasive detection of bone tumors. In previous studies, Li et al carried out a real-time minimally invasive study of the vertebral tissue scattering characteristics based on near-infrared technology 26 . In this paper, based on the pre-developed near-infrared detection equipment, the curative effect evaluation factors of bone tissue before and after microwave ablation were studied, and the changes of different factors were compared, which laid the foundation for quantitative evaluation of tissue thermal damage in microwave ablation.…”