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- W2428862509 abstract "The purpose of this study was to observe the process of fixation in liver specimens non-invasively by means of magnetic resonance. The fixation process of several formaldehyde-containing solutions was monitored with MRI and MRS at two different temperatures.Liver specimens were conserved in aqueous fixative solutions containing formaldehyde concentrations of 0.7, 1.8, 4 and 7.2 % and at different temperatures of 5 degrees C and 20 degrees C. MRI was performed with T1-, T2- and PD-weighted TSE sequences, a 2D FLASH-sequence with and without magnetization transfer, and a FISP 3D-sequence on a clinical 1.5 Tesla MR whole-body unit, and MRS with (1)H-spectroscopic methods (STEAM-sequence) on a 3 Tesla MR whole-body unit.The diffusion of formaldehyde into the tissue was best identified on PD- and T1-weighted images as a band under the liver surface with increasing thickness, penetrating especially fast during the first three days. Spectroscopic measurements revealed the rising formaldehyde concentration in the inner part of the organs. Temperature had no significant influence on the velocity of immersing, but cooling conditions produced less gas-filled caverns due to reduced undesired decomposition processes.The spatial and temporal process of ongoing fixation in the liver can be monitored by MRI. MRS confirms a rising concentration of formaldehyde during ongoing fixation." @default.
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- W2428862509 date "2004-04-01" @default.
- W2428862509 modified "2023-09-27" @default.
- W2428862509 title "Beobachtung und Kontrolle von Fixiervorgängen in Leberpräparaten mittels MRT und MRS" @default.
- W2428862509 doi "https://doi.org/10.1055/s-2004-812778" @default.
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