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- W2900917771 abstract "Purpose To initiate the archive of relaxation‐weighted images that may help discriminate between pulmonary pathologies relevant to acute respiratory distress syndrome. MRI has the ability to distinguish pathologies by providing a variety of different contrast mechanisms. Lungs have historically been difficult to image with MRI but image quality is sufficient to begin cataloging the appearance of pathologies in T 1 ‐ and T 2 ‐weighted images. This study documents T 1 and the use of T 1 contrast with four experimental rat lung pathologies. Methods Inversion‐recovery and spoiled steady state images were made at 1.89 T to measure T 1 and document contrast in rats with atelectasis, lipopolysaccharide‐induced inflammation, ventilator‐induced lung injury (VILI), and injury from saline lavage. Higher‐resolution Ernst‐angle images were made to see patterns of lung infiltrations. Results T 1 ‐weighted images showed minimal contrast between pathologies, similar to T 1 ‐weighted images of other soft tissues. Images taken shortly after magnetization inversion and displayed with inverted contrast highlight lung pathologies. Ernst‐angle images distinguish the effects of T 1 relaxation and spin density and display distinctive patterns. T 1 for pathologies were: atelectasis, 1.25 ± 0.046 s; inflammation from instillation of lipopolysaccharide, 1.24 ± 0.015 s; VILI, 1.55 ± 0.064 s ( p = 0.0022 vs. normal lung); and injury from saline lavage, 1.90±0.080 s ( p = 0.0022 vs. normal lung; p = 0.0079 vs. VILI). T 1 of normal lung and erector spinae muscle were 1.25 ± 0.028 s and 1.02 ± 0.027 s, respectively ( p = 0.0022). Conclusions Traditional T 1 ‐weighting is subtle. However, images made with inverted magnetization and inverted contrast highlight the pathologies and Ernst‐angle images aid in distinguishing pathologies." @default.
- W2900917771 created "2018-11-29" @default.
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- W2900917771 date "2018-11-12" @default.
- W2900917771 modified "2023-10-14" @default.
- W2900917771 title "T1, T1contrast, and Ernst‐angle images of four rat‐lung pathologies" @default.
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- W2900917771 doi "https://doi.org/10.1002/mrm.27582" @default.
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