scholarly journals OC03.06: Prenatal evaluating method of fetal lung maturity using lung-to-liver signal intensity ratio at magnetic resonance imaging (MRI)

2013 ◽  
Vol 42 (s1) ◽  
pp. 6-6
Author(s):  
Y. Oka ◽  
T. Waseda ◽  
N. Neyatani ◽  
H. Takagi ◽  
S. Makinoda
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Intensity Ratio ◽  
Fetal Lung ◽  
Signal Intensity Ratio ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Lung Maturity ◽  
Evaluating Method

scholarly journals Ultrasonography compared to magnetic resonance imaging in thyroid-associated Graves' ophthalmopathy

2011 ◽  
Vol 55 (3) ◽  
pp. 184-188 ◽  
Author(s):  
Ana R. Vlainich ◽  
João H. Romaldini ◽  
Ana B. Pedro ◽  
Chady S. Farah ◽  
Cicero A. Sinisgalli Jr.
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Intensity Ratio ◽  
Inverse Correlation ◽  
Poor Correlation ◽  
Clinical Activity ◽  
Signal Intensity Ratio ◽  
Resonance Imaging ◽  
Graves Ophthalmopathy

OBJECTIVE: To compare ultrasonography (US) to magnetic resonance imaging (MRI) and the clinical activity score (CAS) in Graves' ophthalmopathy. SUBJECTS AND METHODS: Nineteen patients underwent extraocular muscle thickness measurements by US and MRI, reflectivity by US and signal-intensity ratio by MRI. There were also twelve US control subjects. RESULTS: US median thicknesses were greater than in controls. Correlation was found between US and MRI in the median thickness of the left eye rectus medial muscle as well as between signal-intensity ratio (SIR) and thickness by US. An inverse correlation was found between reflectivity and SIR in the inferior and lateral rectus. On associating the tests for detecting activity the best results were obtained with CAS plus MRI (sensitivity 75%), and US and MRI (positive predictive value 77% and specificity 80%). CONCLUSION: CAS and US results showed poor correlation with MRI results suggesting that they cannot replace each other but when combined these methods can improve the evaluation of thyroid-associated ophthalmopathy.

Brainstem hyperintensity in patients with vestibular schwannoma is associated with labyrinth signal on magnetic resonance imaging but not vestibulocochlear tests

2020 ◽  
pp. 197140092098016
Author(s):  
Bernardo Corrêa de Almeida Teixeira ◽  
Felipe Constanzo ◽  
Patricia Sens ◽  
Ricardo Ramina ◽  
Dante Luiz Escuissato
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Vestibular Schwannoma ◽  
Signal Intensity ◽  
Intensity Ratio ◽  
Signal Intensity Ratio ◽  
Resonance Imaging ◽  
Function Tests ◽  
Imaging Characteristics ◽  
Brainstem Response

Objectives Focal hyperintensity in the dorsal brainstem (HDB) has been described in large cerebellopontine angle tumours and is thought to represent vestibular nuclei degeneration, but its functional significance has not been thoroughly investigated. Our aim was to analyse its relationship to imaging characteristics of the tumour and inner-ear structures and to vestibulocochlear functional tests. Methods We retrospectively reviewed 54 patients with a histological diagnosis of vestibular schwannoma (VS). Magnetic resonance imaging tumour characteristics (size, cystic composition and distance from the cochlear aperture), signal intensity ratio of the cochlea and vestibule in fluid-attenuated inversion recovery (FLAIR) and fast imaging employing steady-state acquisition (FIESTA)/fast spin-echo imaging with variable flip angles (CUBE) and vestibulocochlear function tests (audiometry, auditory brainstem response (ABR) and video head impulse testing (vHIT)) were obtained. Statistical analyses were performed to evaluate their relation to focal HDB. Results Focal HDB was found in 22% of VS. It was significantly associated with large ( p < 0.001) and cystic ( p = 0.004) tumours and also with tumours located further from the cochlear aperture ( p = 0.039). The signal intensity ratio of the cochlea on FLAIR was higher in patients with HDB ( p < 0.014), but this difference was not observed in FIESTA/CUBE ( p = 0.981). Audiometry, ABR and vHIT results did not significantly differ in patients with HDB, but ABR results were worse in patients with higher cochlear signal intensity on FLAIR sequences ( p = 0.026). Conclusions Focal HDB in patients with VS was associated with increased signal intensity ratio of the cochlea on FLAIR in patients with VS but not directly to the results of vestibulocochlear function tests.

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