RESUMO
PURPOSE: Quantitative cardiac MRI, and more particularly T1 mapping, has become a most important modality to characterize myocardial tissue. In this work, the value of a radial variant of the conventional modified Look-Locker inversion recovery sequence (raMOLLI) is demonstrated. METHODS: The raMOLLI acquisition scheme consisted of five radial echo trains of 80 spokes acquired using either a fast low-angle shot (FLASH) or a true fast imaging with steady-state-precession (TrueFISP) readout at different time points after a single magnetization inversion. View sharing combined with a compressed sensing algorithm allowed the reconstruction of 50 images along the T1 relaxation recovery curve, to which a dictionary-fitting approach was applied to estimate T1 . The sequence was validated on a nine-vial phantom, on 19 healthy subjects, and one patient suffering from dilated cardiomyopathy. RESULTS: The raMOLLI sequence allowed a significant decrease of myocardial T1 map acquisition time down to five heartbeats, while exhibiting a higher degree of accuracy and a comparable precision on T1 value estimation than the conventional modified Look-Locker inversion recovery sequence. The FLASH readout demonstrated a better robustness to B0 inhomogeneities than TrueFISP, and was therefore preferred for in vivo acquisitions. CONCLUSIONS: This sequence represents a good candidate for ultrafast acquisition of myocardial T1 maps. Magn Reson Med 79:1387-1398, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
Assuntos
Técnicas de Imagem Cardíaca/métodos , Coração/diagnóstico por imagem , Processamento de Imagem Assistida por Computador/métodos , Imageamento por Ressonância Magnética/métodos , Adulto , Cardiomiopatia Dilatada/diagnóstico por imagem , Simulação por Computador , Feminino , Frequência Cardíaca/fisiologia , Humanos , Masculino , Imagens de Fantasmas , Adulto JovemRESUMO
Bronquiolitis Obliterante (BO) en niños es una entidad nosológica pulmonar poco frecuente y de escaso entendimiento fisiológico. Sin embargo, para el kinesiólogo es fundamental conocerla a fondo, pues cuenta con un importante papel en la prevención, reconocimiento y tratamiento, tanto en la etapa aguda como secuelar. En este artículo se da a conocer el estado del arte de esta patología con énfasis en la BO post viral que en nuestro país es la más importante. El desarrollar estrategias terapéuticas innovadoras en ésta y otras patologías crónicas debe ser nuestro desafío en el futuro próximo.
