Vergleich zweier Navigationshilfen für CT-gesteuerte Interventionen unter besonderer Berücksichtigung der Nutzungseigenschaften der verwendeten Systeme

PURPOSE: Investigation of the influence of CT-based navigation systems on the success of an intervention, assessment of the advantages and disadvantages of the utilized systems, and evaluation of the ergonomic system properties. MATERIALS AND METHOD: A simple guiding system PatPos Invent™ and the computer-based navigation system PinPoint™ were employed on two CT systems. In order to investigate the influence of the navigation aids on the success of the interventions, 96 prospective, randomized, and standardized punctures were performed on a specifically developed, rigid phantom. 16 examiners punctured 6 targets with 3 degrees of difficulty with the navigation aids. RESULTS: Irrespective of the experience of the examiner, both navigation systems guided the target with an equal degree of certainty. PinPoint significantly reduced the length of the examination time (12 - 25 min) as compared to PatPos Invent (20 - 40 min). The expectation conformity and comprehensibility of PatPos Invent were assessed significantly more positively than PinPoint with regard to the general handling of the system. In contrast, the assessment of the usability during preoperative setup favored PinPoint. The type of navigation system has no influence on the precision of the implementation of a puncture procedure. CONCLUSION: In the overall assessment of the handling of the systems, PatPos Invent was determined to be easier to comprehend and to provide greater conformity with expectations. With regard to the self-descriptive capacity and usability, PinPoint was assessed more positively. Both systems enable safe puncturing at all degrees of difficulty. The weak point of both systems is the failure to take patient movement into account.