On the assessment of time-shift variations from backscattered ultrasound for large temperature changes in biological phantoms

作     者：César A. Teixeira Maria Graça Ruano Wagner C.A. Pereira 

作者机构：Centre for Informatics and Systems Faculty of Sciences and Technology University of Coimbra 3030-290 Coimbra Portugal Centre for Inteligent Systems Faculty of Scieneces and Technology University of Algarve 8005-139 Faro Portugal Biomedical Eng. Program/COPPE Federal University of Rio de Janeiro Bloco H PO Box 68510 Ilha do Fundão ZIP 21.941-972 Rio de Janeiro Brazil 

出 版 物：《Physics Procedia》 

年 卷 期：2010年第3卷第1期

页      面：701-706页

学科分类：07[理学] 

主　　题：Non-invasive temperature estimation Temperature models Time-shift estimation Ultrasound 

摘      要：This work reports the assessment of time-shifts (TS) from backscattered ultrasound (BSU) signals when large temperature variations (up to 15 ∘ C) were induced in a gel-based phantom. The results showed that during cooling temperature is linear with TS at a rate of approximately 74 ns/ ∘ C. However during a complete heating/cooling cycle, the relation is highly non-linear. This can be explained by the fact that during cooling the temperature distribution is more uniform. Another problem to report is that TS is very sensitive to external movements.