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Master Thesis

Contraste et rehaussement des HNF en IRM : comparaison de la triple phase artérielle et de la simple phase artérielle

Abstract : Purpose. To compare enhancement and contrast of FNH obtained with a triple arterial phase acquisition with a simple arterial phase acquisition; to determine the optimal arterial phase of FNH. Materials and Methods. Twenty patients (average age: 47 years; 20-60 years) with 30 FNH (simple phase group) were imaged with a conventional spoiled gradient echo acquisition and 15 patients (average age: 42 years; 20-66 years) with 20 FNH (triple phase group) were imaged with a triple arterial phase acquisition in parallel imaging, after the administration of gadolinium. Arterial enhancement of FNH, image quality,and respiratory artefacts were qualitatively graded. The ratio of lesion to parenchyma enhancement as well as relative enhancement of FNH were calculated. Type of phase obtained (angiographic, early arterial, late arterial and portal) were related. Mann-Whitney, Fisher et Chi-2 tests were used to compare differences. Results. One hundred per cent (20/20) of FNH of triple phase group and 73% (22/30) of FNH of simple phase group were intensely enhanced (p=0,042). Ten per cent (3/30) of FNH of simple phase group presented weak enhancement and MRI diagnosis could not have been made. The ratio of lesion to parenchyma enhancement was higher in triple phase group (p=0,004). There was no loss of image quality and no additionally respiratory artefacts in triple phase group. Optimal arterial phase of FNH was the early arterial phase. Conclusion. Triple arterial phase acquisition in parallel imaging resulted in higher arterial enhancement and better ratio of lesion to parenchyma enhancement than in simple arterial phase conventional acquisition.
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Master Thesis
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Caroline Rousseau. Contraste et rehaussement des HNF en IRM : comparaison de la triple phase artérielle et de la simple phase artérielle. Médecine humaine et pathologie. 2014. ⟨dumas-01134558⟩

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