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• W3013645016 abstract "To investigate the advantages of using modified signal intensity measurements on chemical shift imaging alone or in conjunction with proton magnetic resonance spectroscopy in the differential diagnosis of adrenal adenomas.This was a prospective study involving 97 patients with adrenal nodules or masses. The signal intensity index (SII) was calculated as [(signal intensity on the in-phase image - signal intensity on the out-of-phase image) ∕ (signal intensity on the in-phase image)] × 100%. We determined the averages of the minimum, mean, and maximum signal intensity values measured on three consecutive images. When that was not possible (for smaller lesions), we used one or two images. We employed a region of interest that covered one half to two thirds of the mass. All indices were compared with metabolite ratios derived from spectroscopy: lactate/creatine; glutamine-glutamate/creatine; choline/creatine; choline/lipid; 4.0-4.3 ppm/Cr; and lipid/creatine.Of the 97 patients evaluated, 69 were diagnosed with adenomas and 28 were diagnosed with nonadenomas. All SII measurements and spectroscopy-derived metabolite ratios were significant to the differentiation between adenomas and nonadenomas, except for the lipid/creatine and choline/lipid ratios. In 37.8% of the cases, it was not possible to perform spectroscopy. When it was possible, the lactate/creatine ratio was found to have higher accuracy than did the SII.Determining the SII and metabolite ratios increased the accuracy of the differential diagnosis of adrenal adenomas.Investigar as vantagens do uso de medições do índice de intensidade de sinal modificadas em imagens de deslocamento químico (chemical shift), isoladamente ou em conjunto com a espectroscopia por ressonância magnética de prótons, no diagnóstico diferencial de adenomas adrenais.Estudo prospectivo envolvendo 97 pacientes com nódulos ou massas adrenais. O índice de intensidade do sinal (SII) foi calculado como [(intensidade do sinal na imagem em fase – intensidade do sinal na imagem fora de fase) ∕ (intensidade do sinal na imagem em fase)] × 100%. Determinamos as médias dos valores mínimo, médio e máximo da intensidade do sinal medida em três imagens consecutivas. Quando isso não foi possível (para lesões menores), usamos uma ou duas imagens. Nós empregamos uma região de interesse que cobria de metade a dois terços da massa. Todos os índices foram comparados com razões metabólicas derivadas da espectroscopia: lactato/creatina, glutamato-glutamina/creatina, colina/creatina, colina/lipídio, 4,0–4,3 ppm/creatina e lipídio/creatina.Dos 97 pacientes avaliados, 69 foram diagnosticados como adenomas e 28 foram diagnosticados como não adenomas. Todas as medições SII e razões de metabólitos derivados da espectroscopia foram significativas para a diferenciação entre adenomas e não adenomas, exceto as razões lipídio/creatina e colina/lipídio. Em 37,8% dos casos não foi possível realizar espectroscopia. Quando possível, a razão lactato/creatina apresentou maior precisão do que o SII.A determinação das razões SII e metabólitos aumentaram a acurácia do diagnóstico diferencial de adenomas adrenais." @default.
• W3013645016 created "2020-04-03" @default.
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• W3013645016 date "2020-04-01" @default.
• W3013645016 modified "2023-10-02" @default.
• W3013645016 title "The value of signal intensity on T1-weighted chemical shift magnetic resonance imaging combined with proton magnetic resonance spectroscopy for the diagnosis of adrenal adenomas" @default.
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• W3013645016 doi "https://doi.org/10.1590/0100-3984.2019.0095" @default.
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