Dissertation > Excellent graduate degree dissertation topics show

Study of Temperature Measurement with Ultrasonic Echo Pulse during HIFU Therapy

Author: SongPing
Tutor: QianShengYou
School: Hunan Normal University
Course: Circuits and Systems
Keywords: High Intensity Focused Ultrasound (HIFU) Ultrasonic Echoes Tissue Temperature Cross-correlation Wavelet Analysis
CLC: R454.3
Type: Master's thesis
Year: 2007
Downloads: 88
Quote: 1
Read: Download Dissertation

Abstract


High Intensity Focused Ultrasound (HIFU) therapy can succeed only one time and not has the side effect. It is considered as one of the new technologies which have the most potential application for tumor therapy in 21st century. Its key point is whether the temperature is able to be controlled correctly or not. Because of the suffering of the patients the application of the invasive temperature measurements is limited. Therefore, non-invasive thermometry is increasingly becoming the scientist’ s investigation focus. For the low cost and the good compatibility, the ultrasonic non-invasive is especially concerned.It fully makes use of the B-mode equipment to set up a HIFU therapy and temperature measurement system and has done abundant experiments in vitro. The ultrasonic echo signals which are irradiated by HIFU are analyzed by many methods. It has discussed which approach is appropriate to open out the tissue temperature and trait change. The main work is summarized as follows:1. The methods of extracting signals irradiated by HIFU are studied. The signal pre-processing methods are determined by analyzing the signal character in time and frequency area.2. The time shift of the ultrasonic echo irradiated by HIFU with the temperature change is analyzed by cross-correlation. The research has discovered that it has bad repetition and is only effective in small area.3. The echo signal energy change is analyzed by echo amplitude and wavelet coefficient methods. The result shows that the echoes energies relative change approaches the linearity along with the temperature increase to increase in the 37℃~60℃, but appears the disorder with the temperature in 60℃above.4. The attenuation of the amplitude and the center frequency content of echo is analyzed. The result shows that the echo signals attenuation change is very small below 45℃, but can accurately reflect the temperature change information in 45℃~65℃.It has been discovered that the trend of the echo parameters changes with temperature in certain extent by using every approach. Although these methods only have good repetition in the certain temperature range, but can accurately open out the tissue denatured region. It is difficult to measure the temperature exactly. However all these results have important consulting value to the temperature monitoring and the tissue denatured determination in HIFU therapy.

Related Dissertations

  1. Research on Testing and Analyzing Technology for Time Parameter of Aerospace Relay,TM58
  2. A Study on the Technology of the Infrared Image Matching,TP391.41
  3. Study of Event Related Potentials Based on Chinese Auditory Cognition,R318.0
  4. China’s Financial Development, Financial Structure and Output Stability,F124;F224
  5. Research Implementation of Crack Detection Method Based on Its Acoustic Property,TP274
  6. The Study of Palmprint Image Identification Based on Wavelet Analysis,TP391.41
  7. Study of GPS Data De-noising Method Based on Wavelet and Kalman Filtering,P228.4
  8. On-line Monitoring of Tool Wear for Mass Production,TG71
  9. The Analysis and Research of the Gait Signal Based on the Detended Cross-Correlation Analysis and Multifractal Detrended Cross-Correlation Analysis,TN911.6
  10. Design and Implementation of High Performance Image Correlator Based on SOPC,TP391.41
  11. Based on an RFID chip placement GHT Visual Positioning Technology,TN405
  12. Development of high-resolution gamma-ray logging tool,TE927
  13. Leakage and arc fault protection circuit breaker research,TM561
  14. Based on morphological analysis of small current grounding fault identification technology and engineering,TM862
  15. Based on wavelet analysis method for fast simulation of fluid,TP391.41
  16. FPGA-based power system harmonic detection system research and design,TM935
  17. Based on wavelet and neural network theory of power system load forecasting,TM715
  18. Analog Circuit Fault Diagnosis Method and Its Application,TN710
  19. DSP FPGA -based near-infrared detector key technology research,TN791
  20. Wavelet Analysis Based Signal Denoising Research in MEMS Gyroscope,TN911.4
  21. Application of Wavelet Analysis in Abnormal Sound Diagnosis of Motorcycle Engines,U483

CLC: > Medicine, health > Clinical > Therapy > Physical therapy,naturopathy > Sound therapy
© 2012 www.DissertationTopic.Net  Mobile