Estimation of Gadolinium-induced T1-shortening with Measurement of Simple Signal Intensity Ratio between the Cochlea and Brain Parenchyma on 3D-FLAIR: Correlation with T1 Measurement by TI Scout Sequence
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概要
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Purpose: T1-shortening of labyrinthine fluid on 3-dimensional fluid-attenuated inversion recovery (3D-FLAIR) has been reported in many inner ear disorders. Although semi-quantitative assessment by simple signal intensity ratio between cochlear fluid and brain tissue has been tried, its feasibility using a multi-channel phased-array head coil with an inherently inhomogenous sensitivity distribution has not been fully evaluated. We evaluated the feasibility of measuring simple signal intensity ratio by correlating rapid T1 measurements using an inversion time (TI) scout sequence. Materials and Methods: We evaluated 10 patients with Menieres disease and 4 patients with sudden deafness. Nine of the patients with Menieres disease received a unilateral intratympanic injection of Gd-DTPA; the tenth patient received bilateral injections. The 4 patients with sudden deafness received a double-dose intravenous injection. Magnetic resonance (MR) images were obtained 24 hours after intratympanic injections and 4 hours after intravenous injections at 3 tesla using a 32-channel head coil. We measured the ratio (CM ratio) between the signal intensity of the perilymph in the cochlea (C) and that of the medulla oblongata (M) and correlated it with the null-point inversion time (TInull) obtained with the TI scout sequence. The TI scout consisted of 85 images obtained with TI values between 132.5 and 3087.5 ms at increments of 37.5 ms. Results: The correlation coefficient between TInull and the natural logarithm of the CM ratio was −0.88 (P<0.01). There was significant negative linear correlation. Conclusions: Measurement of the simple signal intensity ratio between the cochlea and the medulla can be used for semi-quantitative analysis of 3D-FLAIR. The results of this study may facilitate clinical research of inner-ear disease using 3D-FLAIR.
著者
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NAGANAWA Shinji
Department of Radiology, Nagoya University Graduate School of Medicine
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KAWAI Hisashi
Department of Radiology, Nagoya University Graduate School of Medicine
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NAKASHIMA Tsutomu
Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine
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Ishihara Shunichi
Department of Human Science, Bunkyo University
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IWANO Shingo
Department of Radiology, Nagoya University Graduate School of Medicine
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SONE Michihiko
Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine
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