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Experimental studies in transmission ultrasound computed tomography
1Regional Medical Physics Department, Newcastle General Hospital, UK.
Physics in Medicine and Biology
|November 1, 1991
Summary
This study reconstructs speed-of-sound distributions using computed tomography (CT) with ultrasonic pulses. High-quality speed-of-sound images were achieved for phantoms, with proposed improvements for in-vitro tissue imaging.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Acoustics
Background:
- Computed tomography (CT) techniques can reconstruct speed-of-sound distributions from ultrasonic pulse measurements.
- Understanding speed-of-sound variations is crucial for various medical imaging applications.
Purpose of the Study:
- To explain the mathematical relationship between speed-of-sound imaging and conventional CT.
- To describe an experimental system for in-vivo ultrasound CT.
- To present techniques for data acquisition, image reconstruction, and artifact reduction.
Main Methods:
- Utilized CT techniques with transmitted ultrasonic pulses.
- Employed pulse time-of-flight measurements via threshold or cross-correlation methods.
- Applied artifact reduction techniques like median and modified Shepp-Logan filtering.
Main Results:
- Successfully obtained high-quality speed-of-sound images of various phantoms.
- Observed limitations in in-vitro tissue imaging due to refraction and attenuation.
- Demonstrated the effectiveness of artifact reduction methods.
Conclusions:
- CT techniques are effective for speed-of-sound imaging in phantoms.
- Refraction and attenuation pose challenges for in-vitro tissue imaging.
- Improvements are proposed for future ultrasound CT systems to address these challenges.