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Cone-beam computed tomography-guided stereotactic liver punctures: a phantom study.

Grzegorz Toporek¹, Daphné Wallach², Stefan Weber¹

¹ARTORG Center for Biomedical Engineering Research, University of Bern, Murtenstrasse 50, 3008, Bern, Switzerland.

Cardiovascular and Interventional Radiology

|May 15, 2013

Summary

This summary is machine-generated.

Navigated C-arm cone-beam CT (CBCT) allows for accurate needle punctures in local thermal therapies, comparable to traditional CT scans. This imaging technique offers a viable alternative when CT availability is limited, ensuring precise probe placement.

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Area of Science:

Medical Imaging
Interventional Radiology
Image-Guided Therapy

Background:

Computed tomography (CT) navigation enhances local thermal therapy outcomes through accurate probe placement.
Limited CT availability for lengthy procedures necessitates alternative imaging solutions.
C-arm cone-beam CT (CBCT) offers a 3D imaging alternative for navigation.

Purpose of the Study:

To evaluate the accuracy of navigated needle punctures guided by CBCT.
To compare CBCT-guided accuracy with CT-controlled procedures.
To assess the feasibility of CBCT for planning and navigation in interventional radiology.

Main Methods:

Navigated punctures were performed on a nonrigid phantom using a liver-specific navigation system and CBCT.
Target positioning accuracy (TPECBCT) was calculated from control CT scans.
CBCT-to-CT image coregistration was performed to assess guidance accuracy.

Main Results:

Lateral positioning accuracy using CBCT (2.1 ± 1.0 mm) was comparable to CT (2.3 ± 1.3 mm).
Image coregistration yielded a fiducial registration error of 0.3 ± 0.1 mm.
The average target registration error was 2.1 ± 0.7 mm, with an overall TPECBCT-CT of 3.1 ± 1.3 mm.

Conclusions:

Stereotactic needle punctures can be accurately planned and executed using volumetric CBCT.
CBCT guidance, when controlled with multidetector CT, achieves positioning accuracy similar or superior to CT alone.
CBCT presents a practical alternative for navigated interventions where CT access is restricted.