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Effect of focal zone on a curved array transducer
1Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania 19107-5244.
Investigative Radiology
|January 1, 1993
Summary
Electronic focusing of ultrasound transducers significantly alters received signal frequency and power. These changes, dependent on depth and phantom attenuation, impact tissue characterization and clinical imaging.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Diagnostic Ultrasound
Background:
- Ultrasound imaging relies on analyzing received signals.
- Electronic focusing is a key technique in modern ultrasound transducers.
- Understanding signal alterations is crucial for accurate interpretation.
Purpose of the Study:
- To investigate the impact of electronic focusing on received ultrasound signals.
- To analyze how focusing affects signal frequency and power at various depths.
- To determine the relationship between focusing parameters and phantom attenuation.
Main Methods:
- Imaged tissue-mimicking phantoms with varying focal distances (2-12 cm).
- Utilized Fourier analysis to process received ultrasound signals.
- Computed average frequency and power as functions of depth.
Main Results:
- Received frequency initially increased then decreased linearly with depth, influenced by attenuation.
- Frequency decay at greater depths depended on the focal zone.
- Received power peaked at the focal depth and decayed exponentially, independent of focusing.
Conclusions:
- Electronic focusing demonstrably alters ultrasound signal frequency and power.
- These alterations have significant implications for tissue characterization.
- The findings are relevant for optimizing clinical ultrasound imaging applications.