Table 1. Mean Likert item scores on usability and workflow of navigation tool by 24 operators from three groups.
| Question | All | Rank | AR * | RR * | MS * |
|---|---|---|---|---|---|
| Q01—I have understood how the navigation system works. | 4.89 | 1 | 4.75 | 4.88 | 4.75 |
| Q12—I would use the system again. | 4.75 | 2 | 4.75 | 4.88 | 4.63 |
| Q09—The system provides additional safety. | 4.67 | 3 | 4.63 | 4.88 | 4.50 |
| Q05—I had the impression that biopsies became easier with the number of targets. | 4.67 | 4 | 4.50 | 4.75 | 4.75 |
| Q11—Biopsies would not be simpler without the navigation scene on the screen. † | 4.67 | 4 | 4.75 | 4.50 | 4.75 |
| Q08—The time required to perform a biopsy with that system is not too long. † | 4.58 | 6 | 4.50 | 4.63 | 4.63 |
| Q10—The extra technical efforts needed are justified in view of the benefit. | 4.42 | 7 | 4.50 | 4.38 | 4.38 |
| Q13—I have confidence in this technique. | 4.21 | 8 | 4.25 | 4.13 | 4.25 |
| Q02—I can easily orient myself and guide the needle by looking at the navigation screen. | 4.13 | 9 | 4.13 | 4.38 | 3.88 |
| Q03—It is easy to mentally transfer the images on the navigation screen to the real world. | 3.92 | 10 | 3.88 | 4.38 | 3.50 |
| Q04—Operation of the navigation system is self-explaining. | 3.88 | 11 | 3.88 | 3.75 | 4.00 |
| Q06—The articulating module enables easy adjustment and fixation of the biopsy needle. | 3.67 | 12 | 3.13 | 4.00 | 3.88 |
| Q07—The navigation system is not susceptible to external perturbations. † | 2.79 | 13 | 2.88 | 3.25 | 2.25 |
| Mean over all items | 4.24 | 4.19 | 4.37 | 4.16 |
* AR: attending radiologists, RR: resident radiologists, and MS: medical students
† opposite item with reverse score, original item was negatively keyed