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AgradecimentosAgradeço a Deus por ter colocado as seguintes pessoas em meu caminho:Francisco Lotufo, por confiar em mim e neste trabalho, por sua amabilidade e exemplo de profissional que me inspirou para evoluir.Meus pais, Alfredo Vogel e Luzia Maria Vogel, por todo amor e por me conduzirem sempre pelos melhores caminhos.Aloysio Camargo, sua ajuda e apoio foram muito significativos para que eu pudesse ser hoje uma psicóloga clínica.Mariângela Savoia, Marcia Scazufca e Felipe Corchs, pelas sugestões de melhoria do trabalho.Michaele Saban, por sua amizade, parceria e companhia nos aprendizados sobre a ACT e na escuta das gravações dos tratamentos.Heidi Blanche Meyer Pflug, por me conduzir ao caminho da verdade, da luz e do amor.Às queridas Maria Lucia Rossi e Cristiane Maluhy Gebara pela amizade e torcida.Pedro Gordon, pela ajuda na etapa da triagem e redação do artigo.Clarice Gorenstein e Geraldo Buzzatto, pela permissão ao uso do simulador.Aos participantes do estudo, por confiarem e saírem de suas zonas de conforto. AbstractVogel, Karen. Acceptance and Commitment Therapy to treat phobia of enclosed spaces: a randomized clinical trial.[Dissertation] São Paulo: School of medicine of the University of São Paulo; 2014.The MRI exams have been in considerable demand in various medical specialties to diagnose diseases. Although it is an effective diagnostic method, patients who are subjected to the exam might present high levels of discomfort due to the confined space of the device. The phobia of enclosed spaces is considered a type of specific phobia, according to the Diagnostic and Statistical Manual of Mental Disorders 5 (APA, 2013). Objectives: to check if a single session of Acceptance and Commitment Therapy is as effective as seven sessions of the same therapeutic model for the treatment of patients with fear of undergoing MRI exams and enclosed spaces phobia. METHODS: A randomized clinical trial study with two parallel groups was performed, one group underwent one session and the other group underwent seven sessions of Acceptance and Commitment Therapy. Participants were assessed at the beginning and at the end of treatment with the following instruments: Claustrophobia Inventory from Rachman and Taylor (1993), Beck Depression Inventory from beck et al. (1961) and Anxiety Inventory State -Trait from Spielberger, Gorsuch and Luschene (1970). The study was performed in a public hospital in the city of Sao Paulo with 30 patients. Main outcome: to remain in a MRI simulator for at least 30 minutes after each treatment. Secondary outcomes: compare the differences in the inventories of Claustrophobia, Beck Depression Inventory and the Anxiety Inventory Trait-State scores compared at the beginning and at the end of treatments. RESULTS: 92.9% of participants (N) on the seven sessions group were able to carry out the MRI exam simulator after treatment, while 50% of participants of the one session group were able carry out the post treatment session in the simulator (p = 0.033). From the participants who had better respo...