A real-time electrical impedance sensing biopsy needle.
V Mishra1, H Bouayad, A Schned
1Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA. vmishra@dartmouth.edu
IEEE Transactions on Bio-Medical Engineering
|August 30, 2012
Summary
This study introduces an electrical impedance spectroscopy (EIS) biopsy device to improve prostate cancer detection. The novel EIS-Bx device enhances diagnostic sensitivity by analyzing tissue electrical properties during biopsy.
Area of Science:
- Oncology
- Biomedical Engineering
- Medical Diagnostics
Background:
- Prostate cancer diagnosis relies on biopsies, which sample a small tissue volume.
- Standard prostate biopsy protocols may miss cancerous areas due to limited sampling.
- Enhancing biopsy sensitivity is crucial for accurate cancer diagnosis.
Purpose of the Study:
- To improve the sensitivity of standard prostate biopsy protocols.
- To integrate electrical impedance spectroscopy (EIS) with conventional biopsy needles.
- To evaluate the capability of EIS to differentiate benign from malignant prostate tissue.
Main Methods:
- A conventional biopsy needle was modified with an EIS sensor (EIS-Bx device).
- The device was tested in saline baths and ex vivo porcine models.
- EIS measurements were taken from ex vivo human prostates alongside histological analysis.
Main Results:
- The EIS-Bx device interrogated a tissue volume of 0.286 cm³.
- Significant differences in conductivity and relative permittivity were observed between benign and malignant prostate tissues.
- Benign tissues exhibited higher conductivity and permittivity than malignant tissues (p < 0.00001).
Conclusions:
- The EIS-Bx device can differentiate between benign and malignant prostate tissues.
- Integrating EIS with biopsy enhances diagnostic sensitivity for prostate cancer.
- This technology holds promise for improving prostate cancer detection accuracy.
