Percorrer por autor "Lopes, Daniel Simões"
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- Anatomy Studio: A tool for virtual dissection through augmented 3D reconstructionPublication . Zorzal, Ezequiel R.; Sousa, Maurício; Mendes, Daniel; Anjos, Rafael Kuffner dos; Medeiros, Daniel; Paulo, Soraia Figueiredo; Rodrigues, Pedro; Mendes, José João; Delmas, Vincent; Uhl, Jean-François; Mogorrón, José; Jorge, Joaquim Armando; Lopes, Daniel Simões"3D reconstruction from anatomical slices allows anatomists to create three dimensional depictions of real structures by tracing organs from sequences of cryosections. However, conventional user interfaces rely on single-user experiences and mouse-based input to create content for education or training purposes. In this work, we present Anatomy Studio, a collaborative Mixed Reality tool for virtual dissection that combines tablets with styli and see-through head-mounted displays to assist anatomists by easing manual tracing and exploring cryosection images. We contribute novel interaction techniques intended to promote spatial understanding and expedite manual segmentation. By using mid-air interactions and interactive surfaces, anatomists can easily access any cryosection and edit contours, while following other user’s contributions. A user study including experienced anatomists and medical professionals, conducted in real working sessions, demonstrates that Anatomy Studio is appropriate and useful for 3D reconstruction. Results indicate that Anatomy Studio encourages closely-coupled collaborations and group discussion, to achieve deeper insights."
- Estimating anatomically plausible segment orientations using a kinect one sensorPublication . Matias, Nuno Vaz; Roupa, Ivo; Gonçalves, Sérgio; Silva, Miguel Tavares da; Lopes, Daniel Simões
- On the potential of virtual reality for locomotion rehabilitationPublication . Gordo, Alexandre; Silva, Inês dos Santos; Nicolau, Hugo; Lopes, Daniel Simões
- Preclinical dental students self-assessment of an improved operative dentistry virtual reality simulator with haptic feedbackPublication . Rodrigues, Pedro; Nicolau, Francisco; Norte, Martim; Zorzal, Ezequiel; Botelho, João; Machado, Vanessa; Proença, Luís; Alves, Ricardo; Zagalo, Carlos; Lopes, Daniel Simões; Mendes, José JoãoTo test and evaluate the second installment of DENTIFY, a virtual reality haptic simulator for Operative Dentistry (OD), on preclinical dental students, by focusing on user performance and self-assessment. Twenty voluntary unpaid preclinical dental students, with different background experience, were enrolled for this study. After the completion of an informed consent, a demographic questionnaire, and being introduced to the prototype (on the first testing session), three testing sessions followed (S1, S2, S3). Each session involved the following steps: (I) free experimentation; (II) task execution; S3 also included (III) completion of questionnaires associated with the experiment (total of 8 Self-Assessment Questions (SAQ)); and (IV) guided interview. As expected, drill time decreased steadily for all tasks when increasing prototype use, verified by RM ANOVA. Regarding performance metrics (Comparisons by Student’s t-test and ANOVA) recorded at S3, in overall, a higher performance was verified for participants with the following characteristics: female, non-gamer, no previous VR experience and with over 2 semesters of previous experience of working on phantom models. The correlation between the participants’ performance (drill time), for the four tasks, and user self-assessment evaluation, verified by Spearman’s rho analysis, allowed to conclude that a higher performance was observed in students who responded that DENTIFY improved their self perception of manual force applied. Regarding the questionnaires, Spearman’s rho analysis showed a positive correlation between the improvement DENTIFY inputs on conventional teaching sensed by students, also enhancing their interest in learning OD, their desire to have more simulator hours and the improvement sensed on manual dexterity. All participating students adhered well to the DENTIFY experimentation. DENTIFY allows for student self-assessment and contributes to improving student performance. Simulators with VR and haptic pens for teaching in OD should be designed as a consistent and gradual teaching strategy, allowing multiplicity of simulated scenarios, bimanual manipulation, and the possibility of real-time feedback to allow for the student’s immediate self-assessment. Additionally, they should create performance reports per student to ensure self-perception/criticism of their evolution over longer periods of learning time.
- Proximity-aware interactive displays for rehabilitation centresPublication . Faria, Afonso; Duarte, Stéphane; Lopes, Daniel Simões; Nicolau, Hugo
- A Usability Study on Widget Design for Selecting Boolean OperationsPublication . Chambel Lopes, Diogo; Mendes, Helena; Portal, Ricardo; Klerk, Rui de; Nogueira, Isabel; Lopes, Daniel SimõesApplying the correct set of Boolean operations is a fundamental task in constructive solid geometry (CSG), which is a staple in automated manufacturing systems. Although textual buttons and icons are the most common interfaces to apply such operations, these require an unnecessary cognitive load that hampers the solid modeling process. This study presents VennPad, a novel CSG widget that gathers all Boolean operations under the same user interface control element and is represented as a two-set Venn diagram. Contrary to conventional CSG widgets, VennPad supports a graphical interface that gives simultaneous access to several types of Boolean operations (intersection, union, difference, symmetric difference and split). A usability study was conducted to ascertain whether VennPad is a more natural interface compared to textual buttons and icon-based widgets for different solid modeling tasks. VennPad proved to be an effective interface to perform Boolean operations. Qualitative feedback places VennPad as the preferred interface, but efficiency results are operation dependent, thus, opening the way to new design iterations.