Segmented 5 versus nonsegmented flow quantitation: comparison of portal vein flow measurements
| Autor: | François Laurent, Jacques Drouillard, E. Laffon, N. Valli, Robin Lecesne, V. de Ledinghen, Jean-Louis Barat, Patrice Couzigou, Dominique Ducassou |
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| Rok vydání: | 1999 |
| Předmět: |
Adult
Male Portal Vein Portal vein General Medicine Flow direction Portal vein flow Image Enhancement Standard deviation Flow (mathematics) Humans Radiology Nuclear Medicine and imaging Acquisition time Statistical analysis Mean flow Blood Flow Velocity Magnetic Resonance Angiography Mathematics Biomedical engineering |
| Zdroj: | Investigative radiology. 34(3) |
| ISSN: | 0020-9996 |
| Popis: | RATIONALE AND OBJECTIVES. Times of acquisition, mean velocities, mean flows, and their respective standard deviations provided by segmented and nonsegmented flow quantifications (FQ) were compared in the main portal veins of ten healthy adults. METHODS. The segmented FQ performed five phase-encoding lines per segment. The authors successively applied the two electrocardiogram-triggered techniques in the same slice perpendicular to the portal flow direction. Their measurements were compared in particular by means of the statistical analysis proposed by Bland and Altman. RESULTS. The segmented 5 FQ reduced the acquisition time by two compared with the nonsegmented FQ. The mean velocity and mean flow values of the two techniques were not significantly different. The standard deviations were similar. CONCLUSIONS. The segmented 5 FQ showed its major advantage in the portal vein: the acquisition time was reduced without any loss of accuracy or any uncertainty enhancement. |
| Databáze: | OpenAIRE |
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