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Using phase information in ultrasonic backscatter for in vivo liver analysis
R C Molthen1, V M Narayanan, P M Shankar
1Biomedical Engineering & Science Institute, Drexel University, Philadelphia, PA 19104, USA.
Ultrasound in Medicine & Biology
|March 4, 1998
Summary
Analyzing ultrasound echo phase reveals scatterer spacing information, aiding in the detection of liver tissue pathology. This method offers a simple yet effective approach to identifying early disease onset.
Area of Science:
- Medical Imaging
- Biophysics
- Ultrasound Technology
Background:
- Ultrasound echo analysis can provide insights into scatterer spacing within tissues.
- This information is particularly relevant for evaluating well-organized biological structures like the liver.
- Quantifying scatterer spacing variations can indicate underlying tissue pathology.
Purpose of the Study:
- To investigate the physical principles linking scatterer locations to ultrasound echo phase.
- To explore the potential of ultrasound phase analysis for pathological assessment of liver tissue.
Main Methods:
- Computer simulations modeling diverse scattering scenarios, including varying regularity and background noise.
- Experimental studies using phantoms to control scattering conditions and observe phase responses.
- Analysis of in vivo ultrasound data from human liver scans.
Main Results:
- Demonstrated that scatterer spacing significantly influences the phase of ultrasound echoes.
- Simulations and phantom studies confirmed the relationship between scatterer regularity and phase characteristics.
- In vivo data analysis revealed that ultrasound echo phase contains valuable information about liver tissue pathology.
Conclusions:
- The phase of the backscattered ultrasound signal is a critical indicator of liver tissue's pathological state.
- Examining ultrasound echo phase offers a promising, simple technique for consistently detecting early pathological changes in liver tissue.