University of Twente Student Theses


Multimodal user interface for robotized flexible endoscopy

Grisel, I.G.J. (2011) Multimodal user interface for robotized flexible endoscopy.

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Abstract:This thesis has set out to describe the creation of a multimodal interface that is to be used in com- bination with a robotized system for controlling a exible endoscope. It falls within the TeleFLEX project that is conducted as a cooperation between Demcon, located in Oldenzaal, the University of Twente and several hospitals located in the Netherlands. First, an introduction about the main topics is given. These topics include endoscopic proce- dures, the TeleFLEX project, the human factors that are associated with endoscopic procedures and the reason behind the steps taken in the process. Following the introduction, an analysis was conducted which resulted in information about the working environment in which endoscopic pro- cedures are conducted, the end users of the interface and the tasks that the end users perform now and are going to perform in the future when using the interface. The future tasks will be executed using a system to help the therapist perform Based on the information gained in the analysis, requirements were created for the system. The requirements consist of critical requirements (for example, the endoscopic output should always be visible), situation dependent requirements (for example, the settings of the system should be adjustable) and additional requirements (for example, the system should have setting profiles). The information from the analysis and the requirements were then used in iteratively designing the interface, with each iteration consisting of creating one or more designs and letting these designs be evaluated. After three iterations, a prototype was created consisting of two screens with one screen presenting the endoscopic output and the other additional functionalities. After completing the iterations and having one prototype and two possible setups for that prototype (seperate screens or a console setup), an experiment was conducted to test the prototype on effectiveness, efficiency and satisfaction in a high workload situation, comparing the two different setups. In this first experiment, there appeared a small preference for the seperate screen setup, with this setup scoring a bit better on all three factors. Several observations were made in regard to the usage as well as the layout of the interface. The results from the first experiment and the made observations were then used to finalize the prototype into a system. Still using two monitors, the system has more color and better distinguishes between important and less important information. The final system was again tested in an high workload setting. The system in itself scored acceptable on the three factors earlier mentioned. Compared to the first experiment, the results remained mostly the same. Again some observations regarding the complete system were made. After the second experiment, it was concluded that the information that is present in the system is at this time sufficient. Considering the information gathered in the analysis and during the two experiments, a choice was made to combine the two setups and give therapists the possibility of deciding themselves which setup they prefer. The addition of audio is imperative in the system, but should mostly be used for errors and warnings, as not to divert the attention of the therapist unnecessarily. As soon as the mechanical parts of the TeleFLEX project are introduced, the interface should be tested in combination with the interface, as this will give a more thorough insight in which parts of the interface can and should be improved to optimally facilitate the therapists in their jobs. The experiments as used in this thesis could be used as prototypes for future testing.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Interaction Technology MSc (60030)
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