Purpose: To evaluate the spatial accuracy and performance of a stereotactic computer guidance optical needle tracking system in CT guided lung biopsies.The purpose of this study is to report on the evaluation of a recently developed, optical stereotactic tracking and guiding system.
The new ActiSight Needle Guidance System (ActiViews Ltd. Haifa Israel) is a stereotactic accessory for Computed Tomography (CT) systems. The system displays a real-time image on a computer monitor of a CT-based model of the target location and the projected tool path intersection with the plane of the target. The guidance system tracks the needle by means of the small optical sensor attached to the proximal end of the needle and a label sticker attached to the surface of the body at the desired point of entry. ActiSight employs a skin pad with eight x-ray absorbing fiducial points that are easily identified and segmented on the CT images providing reference for the coordinates of the lesion. In addition, the system can recognize with high sensitivity any bending of the tool outside the body. An algorithm that takes into account the measured curvature of the tool outside the body and the elastic properties of typical intervention tools.
675 measurements with a testing chamber and four domestic swine using implanted 2 mm seeds in 5 lung targets were performed. 20 patients, with lung lesions suspicious for malignancy underwent CT guided interventions using the novel guidance system with IRB approval. Accuracy of reaching the pre-selected points within the target lesions, number of needle passes and rate of complications were recorded. Results: All lesions (mean diameter 4.3 cm) have been successfully reached with one needle pass. Mean distance between the needle's tip and the pre-selected points within the lesions was 2 mm (1.4). One patient developed a small post procedural pneumothorax.
Conclusions: Our preliminary experience suggests that the use of a stereotactic computer guidance system is accurate. Additional clinical trials are underway.
Enabling to diagnose smaller lesion.
Yehuda Schwarz, Grant monies (from industry related sources) Recived a grant for the reseach from Activiews Ltd.; Shareholder Received future options if the company goes to the stock market; Consultant fee, speaker bureau, advisory committee, etc. Received honoraries for consultation; No Product/Research Disclosure Information