Abstract
The integration of functional imaging modality provided by Positron Emission Tomography (PET) and associated anatomical imaging modality provided by Computed Tomography (CT) has become an essential procedure both in the evaluation of different types of malignancy and in radiotherapy planning. The alignment of these two exams is thus of great importance. In this research work, three registration approaches (1) intensity-based registration, (2) rigid translation followed by intensity-based registration and (3) coarse registration followed by fine-tuning were evaluated and compared. To characterize the performance of these methods, 161 real volume scans from patients involved in Hodgkin Lymphoma staging were used: CT volumes used for radiotherapy planning were registered with PET volumes before any treatment. Registration results achieved 78%, 60%, and 91% of accuracy for methods (1), (2) and (3), respectively. Registration methods validation was extended to a corresponding landmarks points distance calculation. Methods (1), (2) and (3) achieved a median improvement registration rate of 66% mm, 51% mm and 70% mm, respectively. The accuracy of the proposed methods was further confirmed by extending our experiments to other multimodal datasets and in a monomodal dataset with different acquisition conditions. © 2018, Springer Nature Switzerland AG.

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Abstract
Although still little-known, glamping has become a nature-based tourism option for people who want a higher level of comfort. The offer of this type of accommodation is growing, namely in Portugal, but there are still few studies that address the motivations and other relevant factors explaining its adoption or refusal by consumers. The present study applied a qualitative approach aimed at exploring consumers’ motivations or obstacles for choosing glamping, and their perceptions as tourists on the differences between glamping and camping. Data were collected through the conduction of focus groups held in 2017 and content analysis techniques for contextualized interpretations were used. The most important motivational driver to go glamping is the direct contact with nature. Glamour, comfort, privacy and a different experience are also important aspects that consumers appreciate. Inversely, the main obstacles are the cost, the limited offer, the lack of knowledge, and the non-authenticity, compared to camping, of the offer.

Abstract
Guerrilla marketing is an innovative approach to communicate with customers and to capture their attention essentially due to its inherent creativity, unconventional media, and low cost. Despite the interesting contributions in the literature on this topic, most of what is known about guerrilla marketing is confined to its use and impact on consumers. This study aims to fill a gap identified in the guerrilla marketing literature by conducting an exploratory research study on the propensity of performing guerrilla marketing campaigns in a Business-to-Business (B2B) context. The research objectives of this paper are (i) identifying the perceptions of B2B managers on guerrilla marketing campaigns and (ii) exploring determinants of the adoption of guerrilla marketing campaigns targeted at corporate customers.We present the results of a qualitative research study comprising 12 semi-structured interviews with managers of different business areas. A content analysis was performed using Nvivo software.Participants in this study demonstrated that B2B managers recognize and value the advantages associated with guerrilla communication, which is in many instances seen as useful and viable for the B2B sector. The propensity for adoption is dependent on internal factors such as corporate culture, managers’ and collaborators’ profiles, risk-proneness, market share, and product innovativeness, but also on the sector’s usual practices of innovation and communication. Guerrilla marketing campaigns are more appropriate for attracting new B2B customers and need to be carefully adapted to the targets' profiles and preferences.

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