tailieunhanh - Báo cáo hóa học: " Ultrasonic Periodontal Probing Based on the Dynamic Wavelet Fingerprint"

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: Ultrasonic Periodontal Probing Based on the Dynamic Wavelet Fingerprint | EURASIP Journal on Applied Signal Processing 2005 7 1137-1146 2005 Hindawi Publishing Corporation Ultrasonic Periodontal Probing Based on the Dynamic Wavelet Fingerprint Jidong Hou Department of Applied Science The College of William Mary Williamsburg VA 23187-8795 USA Email jbhou@ S. Timothy Rose Valley Periodontics 2535 Northern Road Appleton WI54914 USA Email roset@ Mark K. Hinders Department of Applied Science The College of William Mary Williamsburg VA 23187-8795 USA Email hinders@ Received 17 August 2004 Revised 4 October 2004 Recommended for Publication by Dimitrios Tzovaras Manual pocket depth probing has been widely used as a retrospective diagnosis method in periodontics. However numerous studies have questioned its ability to accurately measure the anatomic pocket depth. In this paper an ultrasonic periodontal probing method is described which involves using a hollow water-filled probe to focus a narrow beam of ultrasound energy into and out of the periodontal pocket followed by automatic processing of pulse-echo signals to obtain the periodontal pocket depth. The signal processing algorithm consists of three steps peak detection characterization peak classification and peak identification. A dynamic wavelet fingerprint DWFP technique is first applied to detect suspected scatterers in the A-scan signal and generate a two-dimensional black and white pattern to characterize the local transient signal corresponding to each scatterer. These DWFP patterns are then classified by a two-dimensional FFT procedure and mapped to an inclination index curve. The location of the pocket bottom was identified as the third broad peak in the inclination index curve. The algorithm is tested on full-mouth probing data from two sequential visits of 14 patients. Its performance is evaluated by comparing ultrasonic probing results with that of full-mouth manual probing at the same sites which is taken as the gold standard. Keywords and phrases .

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