An accelerometer-based guidance device for CT-guided procedures: an improved wireless prototype

Minimally Invasive Therapy & Allied Technologies, vol. 31, pp. 902–908

Abstract

Introduction The aim of the study was to demonstrate the feasibility of a prototype for accelerometer-based guidance for percutaneous CT-guided punctures and compare it with free-hand punctures.Material and methods The prototype enabled alignment with the CT coordinate system and a wireless connectivity. Its feasibility was tested in a swine cadaver model: 20 out-of-plane device-assisted punctures performed without intermittent control scans (one-step punctures) were evaluated regarding deviation to target and difference between planned and obtained angle. Thereafter, 22 device-assisted punctures were compared with 20 free-hand punctures regarding distance to target, deviation from the planned angle, number of control scans and procedure time. Differences were compared with the Mann–Whitney U-test (p < .05).Results The one-step punctures revealed a deviation to target of 0.26 ± 0.37 cm (axial plane) and 0.21 ± 0.19 cm (sagittal plane) and differences between planned and performed puncture angles of 0.9 ± 1.09° (axial plane) and 1.15 ± 0.91° (sagittal planes). In the comparative study, device-assisted punctures showed a significantly higher accuracy, 0.20 ± 0.17 cm vs. 0.30 ± 0.21 cm (p < .05) and lower number of required control scans, 1.3 ± 1.1 vs. 3.7 ± 0.9 (p < .05) compared with free-hand punctures.Conclusion The accelerometer-based device proved to be feasible and demonstrated significantly higher accuracy and required significantly less control scans compared to free-hand puncture.

Authors 8

1. Federico Pedersoli corresponding Aachen Department of Diagnostic and Interventional Radiology

   Universitätsklinikum Aachen · RWTH Aachen University

   Affiliation as printed

   Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen, Germany

2. Christoph Wilkmann Aachen Department of Diagnostic and Interventional Radiology Institute of Applied Medical Engineering

   Universitätsklinikum Aachen · RWTH Aachen University

   Affiliation as printed

   Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen, Germany

   Institute of Applied Medical Engineering, Deptartment of Rehabilitation & Prevention Engineering, RWTH Aachen University, Aachen, Germany

3. Tobias Penzkofer

   Berlin Institute of Health at Charité - Universitätsmedizin Berlin · Charité - Universitätsmedizin Berlin

   Affiliation as printed

   Berlin Institute of Health, Berlin, Germany

   Department of Radiology, Charité Universitätsmedizin Berlin, Berlin, Germany

4. Catherine Dißelhorst-Klug Aachen Institute of Applied Medical Engineering

   RWTH Aachen University

   Affiliation as printed

   Institute of Applied Medical Engineering, Deptartment of Rehabilitation & Prevention Engineering, RWTH Aachen University, Aachen, Germany

5. Thomas Schmitz‐Rode Aachen Institute of Applied Medical Engineering

   RWTH Aachen University

   Affiliation as printed

   Institute of Applied Medical Engineering, Deptartment of Rehabilitation & Prevention Engineering, RWTH Aachen University, Aachen, Germany

6. Christiane Katharina Kuhl Aachen Department of Diagnostic and Interventional Radiology

   Universitätsklinikum Aachen · RWTH Aachen University

   Affiliation as printed

   Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen, Germany

7. Philipp Bruners Aachen Department of Diagnostic and Interventional Radiology

   Universitätsklinikum Aachen · RWTH Aachen University

   Affiliation as printed

   Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen, Germany

8. Peter Isfort Aachen Department of Diagnostic and Interventional Radiology

   Universitätsklinikum Aachen · RWTH Aachen University

   Affiliation as printed

   Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen, Germany