Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Single wave extraction in continuous intracranial pressure signal with lifting wavelet transformation and discrimination rules | Ji et al. EURASIP Journal on Advances in Signal Processing 2011 2011 43 http content 2011 1 43 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Single wave extraction in continuous intracranial pressure signal with lifting wavelet transformation and discrimination rules Zhong Ji Lan Zhu Xing Yang and Lipeng Jiang Abstract Objective This article describes a novel method for processing continuous intracranial pressure ICP signals with lifting wavelet transformation and discrimination rules for ICP waveform morphology. Methods First lifting wavelet was applied to detect the extreme points of ICP waveform preliminarily then the extreme points that were undetected or falsely detected are determined by using the discrimination rules repeatedly finally those falsely detected and undetected points were removed or corrected to improve the accuracy of identified individual pulse. Results The algorithm was employed to analyze continuous ICP signals of nine patients. Signals were recorded for 30 min each. Each signal was divided into 30-s segments and analyzed. The accuracy rate of was obtained. Conclusion The method described in this article has given a possibility for the clinical use of ICP waveform. By identifying the single ICP wave effectively not only mean ICP but also single ICP wave amplitude and latency can be computed precisely with this new method. Keywords intracranial pressure single wave extraction lifting wavelet discrimination rules 1. Introduction Mean intracranial pressure ICP is often regarded as a clinical indicator during continuous ICP monitoring and is computed according to the sum of pressure levels divided by number of samples. However the ICP wave parameters of a single ICP wave such as ICP wave amplitude and latency can provide the information that is not given in mean ICP 1-3 . Many studies have indicated that the ICP wave parameters are related to intracranial .
