title: Accuracy of biopsy needle navigation using the Medarpa system--computed tomography reality superimposed on the site of intervention.
abstract: The aim of this work was to determine the accuracy of a new navigational system, Medarpa, with a transparent display superimposing computed tomography (CT) reality on the site of intervention. Medarpa uses an optical and an electromagnetic tracking system which allows tracking of instruments, the radiologist and the transparent display. The display superimposes a CT view of a phantom chest on a phantom chest model, in real time. In group A, needle positioning was performed using the Medarpa system. Three targets (diameter 1.5 mm) located inside the phantom were punctured. In group B, the same targets were used to perform standard CT-guided puncturing using the single-slice technique. The same needles were used in both groups (15 G, 15 cm). A total of 42 punctures were performed in each group. Post puncture, CT scans were made to verify needle tip positions. The mean deviation from the needle tip to the targets was 6.65+/-1.61 mm for group A (range 3.54-9.51 mm) and 7.05+/-1.33 mm for group B (range 4.10-9.45 mm). No significant difference was found between group A and group B for any target (p>0.05). No significant difference was found between the targets of the same group (p>0.05). The accuracy in needle puncturing using the augmented reality system, Medarpa, matches the accuracy achieved by CT-guided puncturing technique.
authors.affiliation: Institute for Diagnostic and Interventional Radiology, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Germany. fawad@gmx.de
authors.forename: M Fawad
authors.initials: MF
authors.lastname: Khan
authors.forename: Selami
authors.initials: S
authors.lastname: Dogan
authors.forename: Adel
authors.initials: A
authors.lastname: Maataoui
authors.forename: Jessen
authors.initials: J
authors.lastname: Gurung
authors.forename: Mirko
authors.initials: M
authors.lastname: Schiemann
authors.forename: Hanns
authors.initials: H
authors.lastname: Ackermann
authors.forename: Stefan
authors.initials: S
authors.lastname: Wesarg
authors.forename: Georgios
authors.initials: G
authors.lastname: Sakas
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Vogl
mesh_terms: D001707:Biopsy, Needle / Q000295:instrumentation*; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation*; D004867:Equipment Design; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed