Magnetic resonance imaging of lipoma and liposarcoma: Potential of short tau inversion recovery as a technique of fat suppression

2000 ◽  
Vol 44 (4) ◽  
pp. 412-416 ◽  
Author(s):  
Alan Kwok Kuen Pang ◽  
Tudor Hughes
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Fat Suppression ◽  
Inversion Recovery ◽  
Resonance Imaging ◽  
Short Tau Inversion Recovery

Detection of multiple sclerosis lesions in the cervical cord: which of the MAGNIMS ‘mandatory’ non-gadolinium enhanced sagittal sequences is optimal at 3T?

2021 ◽  
pp. 197140092110177
Author(s):  
Chian A Chang ◽  
Abigail L Chong ◽  
Ronil V Chandra ◽  
Ernest Butler ◽  
Deepa Rajendran ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Multiple Sclerosis ◽  
Magnetic Resonance ◽  
Spin Echo ◽  
Inversion Recovery ◽  
Fast Spin Echo ◽  
Proton Density ◽  
Resonance Imaging ◽  
Short Tau Inversion Recovery ◽  
Fast Spin

Background and purpose The magnetic resonance imaging in multiple sclerosis consensus guidelines currently mandate three sagittal non-contrast enhanced sequences of T2-weighted fast spin echo, proton density-weighted fast spin echo and short tau inversion recovery; however, these particular three sequences have not previously been compared at 3T. This study compared T2-weighted fast spin echo, proton density-weighted fast spin echo, short tau inversion recovery as well as the double inversion recovery sequence for the sagittal detection of multiple sclerosis lesions in the cervical spinal cord at 3T. Methods Nineteen multiple sclerosis patients underwent magnetic resonance imaging with 3T sagittal T2-weighted fast spin echo, proton density-weighted fast spin echo, short tau inversion recovery and double inversion recovery between November 2012 and April 2013. Two neuroradiologists independently reviewed the images, and the number of lesions detected on each sequence was recorded. Lesion conspicuity was quantitatively assessed with the lesion-to-cord-contrast ratio and lesion contrast-to-noise ratio. The Wilcoxon signed rank test was performed for statistical analysis. Results Proton density-weighted fast spin echo and short tau inversion recovery detected 32% more lesions compared to T2-weighted fast spin echo, and 37% more lesions compared to double inversion recovery. The lesion-to-cord-contrast ratio was highest in short tau inversion recovery, while the lesion contrast-to-noise ratio was highest for proton density-weighted fast spin echo. Conclusions This study provides the necessary evidentiary support at 3T for the magnetic resonance imaging in multiple sclerosis spinal magnetic resonance imaging protocol consensus guidelines. At 3T sagittal proton density-weighted fast spin echo and short tau inversion recovery sequences allowed improved detection of cervical spinal cord multiple sclerosis lesions, compared to T2-weighted fast spin echo and three-dimensional double inversion recovery magnetic resonance imaging. Utilising T2-weighted fast spin echo alone at 3T is insufficient for lesion detection.

Value of perineural edema/inflammation detected by fat saturation sequences in lumbar magnetic resonance imaging of patients with unilateral sciatica

2009 ◽  
Vol 50 (2) ◽  
pp. 205-211 ◽  
Author(s):  
M. Şirvanci ◽  
B. Kara ◽  
C. Duran ◽  
E. Ozturk ◽  
O. Karatoprak ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Nerve Root ◽  
Magnetic Resonance Images ◽  
Inversion Recovery ◽  
Resonance Imaging ◽  
Mri Findings ◽  
Pain Location ◽  
Pain Drawings ◽  
Short Tau Inversion Recovery

Background: Routine lumbar spine magnetic resonance imaging (MRI) may not show any evidence of the cause of sciatica in some cases. The relationship between nerve root compression detected on lumbar MRI and sciatica is also sometimes uncertain. Purpose: To ascertain whether axial (and, when necessary, sagittal and coronal) short-tau inversion recovery or fat-saturated T2-weighted MRI findings can be used to study the level of sciatica in patients with a non-yielding routine MRI examination. Material and Methods: A total of 215 patients with unilateral sciatica underwent MRI. All patients were asked to complete pain drawing forms describing their pain dermatomal distributions. Perineural edema/inflammation corresponding to the pain location indicated by the pain drawings was sought on short-tau inversion recovery or fat-saturated T2-weighted images. Results: Routine MRI findings revealed that 110 of the 215 patients had nerve root compromise related to the patients’ symptoms. Routine MRI could not ascertain the cause of these symptoms in the remaining 105 patients. In 31 (29.5%) of these 105 patients, short-tau inversion recovery or fat-saturated T2-weighted magnetic resonance images revealed perineural edema/inflammation surrounding the nerve roots related to the pain locations indicated in the pain drawings. Conclusion: Axial (and, when required, sagittal and coronal) short-tau inversion recovery or fat-saturated T2-weighted magnetic resonance images may be helpful for revealing additional findings in cases of unexplained sciatica in standard magnetic resonance imaging. However, the value of this imaging may be not great enough to justify routine use of these additional sequences to study the level of sciatica.

Radiological airway changes following bipolar radiofrequency volumetric tissue reduction

2010 ◽  
Vol 124 (10) ◽  
pp. 1078-1084 ◽  
Author(s):  
R L Heywood ◽  
H M B Khalil ◽  
S Kothari ◽  
S Chawda ◽  
B T Kotecha
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Soft Palate ◽  
Inversion Recovery ◽  
Tongue Base ◽  
Resonance Imaging ◽  
Bipolar Radiofrequency ◽  
Radiofrequency Volumetric Tissue Reduction ◽  
Short Tau Inversion Recovery ◽  
Tissue Reduction

AbstractObjective:To characterise the appearance of lesions of the tongue base and soft palate induced by bipolar radiofrequency volumetric tissue reduction, using magnetic resonance imaging up to six weeks post-procedure.Methods:Five men with sleep-disordered breathing were treated with one session of bipolar radiofrequency volumetric tissue reduction to a number of sites, including the tongue base and soft palate. Magnetic resonance imaging was performed pre-operatively and one week and six weeks after surgery.Results:Lesions were visible from day one. T1 (spine lattice relaxation Time)-weighted images demonstrated areas of central hyperintensity, reflecting haemorrhagic, coagulative necrosis, surrounded by hypointensity, representing oedema; corresponding short tau inversion recovery (STIR) sequences showed central hypointensity with surrounding high signal. The lesions expanded up to day three and then gradually diminished, but were still evident at week six on short tau inversion recovery images.Conclusion:The characterisation of lesions induced by bipolar radiofrequency volumetric tissue reduction enables us to elucidate the pathophysiology of this procedure, to optimise treatment benefits and clinical outcomes, and to explain patient symptoms.

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