Contribuição do índice de intensidade de sinal na sequência t1 desvio químico associado à espectroscopia por ressonância magnética no diagnóstico dos adenomas adrenais

• Ano de defesa: 2016
• Autor(a) principal: Dalavia, Claudio Carvalho [UNIFESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: adenoma; magnetic resonance imaging; adrenal gland neoplasms l; spectral analysis; magnetic resonance spectroscopy; imagem por ressonância magnética; neoplasias das glândulas suprarrenais i; análise espectral; espectroscopia de ressonância magnética
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=3934000; https://repositorio.unifesp.br/handle/11600/46146

OBJECTIVE. To investigate the advantages of using modified signal intensity measurements on chemical shift imaging alone or correlate with proton spectroscopy in the differential diagnosis of adrenal adenomas. SUBJECTS AND METHODS. 97 patients (69 adenomas, 8 carcinomas, 14 pheochromocytomas, 4 metastasis, 1 myelolipoma and 1 granulomatous lesion) underwent chemical shift imaging and spectroscopy. Signal intensity index was calculated as [(signal intensity on in-phase image ? signal intensity on out-of-phase image) / (signal intensity on in-phase image)] × 100%. The averages of three minimum, mean, and maximum signal intensity values measured on three consecutive images, in the smaller lesions if not possible we use one or two images, with the region of interest covering one-half to two-thirds of the mass. All indexes were compared with spectroscopy metabolite ratios (lactate/creatine, glutamine-glutamate/creatine, choline/creatine, choline/lipid, 4.0?4.3 ppm/creatine, and lipid/creatine) for each type of adrenal mass. RESULTS. All signal intensity measurements and spectroscopy metabolite ratios were significant to the differentiation between adenomas and no adenomas, except Lip/Cr and Cho/Lip. Was not possible to apply the spectroscopy in 37,75% of the cases. CONCLUSION. The signal intensity index and spectroscopy metabolite ratios increased the accuracy of the differential diagnosis of adrenal adenomas.