الفهرس 
Physics of Inversion Recovery sequencesيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Summary
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Summary
T1 Inversion Recovery (T1IR) sequence improved tissue contrast by providing higher grey matter- white matter contrast ratio (GM -WM contrast ratio) and higher lesion contrast noise ratio (CNR). This study aims to highlight its significance in the evaluationof space occupying lesions whether intra-axial or extra-axial and also in multiple sclerosis (MS) by comparing it with T1 Spin Echo (T1SE) sequence.
In a total of 50 patients, 14 patients with extra-axial lesions, 18 patients with intra-axial lesions and 18 patients with multiple sclerosis were included. The CNR was significantly higher for precontrast T1IR images than precontrast T1SE [-13.04 (1.20) vs -7.73 (0.70)], (p-value <0.01). After giving intravenous contrast media, CNR in T1SEwas higher than T1IR [11.14(1.75) vs 9.41(1.83)] without statistical significance (p-value =0.19) and CNR was higher in T1IR than T1SE in lesions with low enhancement ratio (ER) . As well, the overall number of lesions was higher on T1IR especially in MS [10.67(2.26) vs 3.89(1.05)] (p-value <0.01).
We concluded that ,On pre-contrast sequences, T1IR could be used as an added sequence in most brain lesions giving higher lesion CNR. After giving intravenous contrast media, T1IR could be used in lesions with low ER. It also could be used in follow up of MS patient by detecting a higher number of lesions that can be easily missed in T1SE.