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Accuracy of liver puncture under US guidance: re-evaluation by microcomputer simulation model
1First Department of Internal Medicine, Akita University School of Medicine, Japan.
Journal of Clinical Ultrasound : JCU
|March 1, 1997
Summary
Ultrasound-guided liver punctures can have needle distortion. Simulation models show displacement and angular errors vary with abdominal wall characteristics and puncture angle, impacting accuracy.
Area of Science:
- Medical Imaging
- Ultrasound Technology
- Surgical Simulation
Background:
- Ultrasound (US)-guided liver puncture is a common procedure.
- Accurate needle placement is crucial for successful liver interventions.
- Needle distortion in sonograms can lead to inaccurate targeting.
Purpose of the Study:
- To evaluate needle distortion during US-guided liver punctures using microcomputer simulation.
- To quantify displacement and angular errors of the puncture needle in sonograms.
- To analyze the influence of abdominal wall properties and puncture angle on needle distortion.
Main Methods:
- Developed simplified microcomputer simulation models for liver puncture.
- Simulated needle passage through abdominal walls (muscular/fatty) and ascites.
- Varied puncture angles, abdominal wall thickness, and ascites characteristics.
Main Results:
- Needle distortion (S-shaped or inverted S-shaped) and displacement errors (up to 17 mm) were observed.
- Errors varied significantly based on abdominal wall composition (fatty vs. muscular).
- Puncture angle and abdominal wall thickness influenced needle shift, while ascites quantity had minimal impact.
Conclusions:
- Needle distortion patterns and errors during US-guided liver puncture are predictable.
- Clinicians should consider these distortion patterns for accurate needle placement.
- Simulation models provide valuable insights for optimizing US-guided procedures.