access_time 27 de janeiro de 2020 às 14:00 até 27 de janeiro de 2020 às 15:00
place Room 0.19, Pavilhão de Informática II, IST, Alameda
Colonography allows medical professionals to navigate inside the intricate tubular geometries of subject-specific 3D colon images using Virtual Reality displays. Typically, camera travel is performed via Fly-Through or Fly-Over techniques that enable semi-automatic traveling through a constrained, well-defined path at user controlled speeds. However, the Fly-Through technique is known to limit the visibility of lesions located behind or inside haustral folds, while Fly-Over requires splitting the entire colon visualization into two specific halves. In this paper, we study the effect of immersive Fly-Through and immersive Fly-Over techniques on lesion detection, and introduce a new camera travel technique that maintains a fixed camera orientation throughout the entire medial axis path. While these techniques have been studied in non-VR desktop environments, their performance is yet not well understood in Virtual Reality setups. We performed a comparative user study to ascertain which camera travel technique is more appropriate for constrained path navigation in immersive Colonography. To this end, we asked 18 participants to navigate inside a 3D colon to find specific marks. Our results suggest that the Fly-Over technique may lead to enhanced lesion detection at the cost of higher task completion times, while the Fly-Through method may offer a more balanced trade-off between both speed and effectiveness, whereas the fixed camera orientation technique provided seemingly inferior performance results. Our study further provides design guidelines and informs further work.
local_offer Tópicos de Investigação
person Candidato: Soraia Isabel Figueiredo Paulo
supervisor_account Orientador: Prof. Joaquim Jorge/ Dr. Nuno Figueiredo / Prof. Daniel Lopes