Determination of carotid disease with the application of STFT and CWT methods
Computers in Biology and Medicine, cilt.37, sa.6, ss.785-792, 2007 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 37 Sayı: 6
- Basım Tarihi: 2007
- Doi Numarası: 10.1016/j.compbiomed.2006.07.003
- Dergi Adı: Computers in Biology and Medicine
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.785-792
- Anahtar Kelimeler: Carotid artery, Carotid disease, Doppler signal, Receiver operating characteristic (ROC) curve, Short-time Fourier transform (STFT), Signal analysis, Sonogram, The continuous wavelet transform (CWT)
- Gazi Üniversitesi Adresli: Hayır
Özet
In this study, Doppler signals were recorded from the output of carotid arteries of 40 subjects and transferred to a personal computer (PC) by using a 16-bit sound card. Doppler difference frequencies were recorded from each of the subjects, and then analyzed by using short-time Fourier transform (STFT) and the continuous wavelet transform (CWT) methods to obtain their sonograms. These sonograms were then used to determine the relationships of applied methods with medical conditions. The sonograms that were obtained by CWT method gave better results for spectral resolution than the STFT method. The sonograms of CWT method offer net envelope and better imaging, so that the measurement of blood flow and brain pressure can be made more accurately. Simultaneously, receiver operating characteristic (ROC) analysis has been conducted for this study and the estimation performance of the spectral resolution for the STFT and CTW has been obtained. The STFT has shown a 80.45% success for the spectral resolution while CTW has shown a 89.90% success. © 2006 Elsevier Ltd. All rights reserved.