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首页> 外文期刊>Radiology >'Black blood' T2-weighted inversion-recovery MR imaging of the heart.
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'Black blood' T2-weighted inversion-recovery MR imaging of the heart.

机译：心脏的“黑血” T2加权反转恢复MR成像。

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PURPOSE: To develop a short-inversion-time inversion-recovery (STIR) magnetic resonance imaging pulse sequence for evaluating the myocardium that is relatively free of flow and motion artifact. MATERIALS AND METHODS: The authors implemented a breath-hold, cardiac-triggered STIR sequence with preparatory radio-frequency pulses to eliminate signal from flowing blood. A segmented rapid acquisition with relaxation enhancement (turbo spin echo) readout was used, with the inversion-recovery delay adjusted to null fat. The sequence was implemented at 1.0 and 1.5 T and tested in phantoms, five healthy volunteers, and three patients. RESULTS: Phantom studies confirmed the expected behavior of the sequence. In the volunteers, fat-suppressed images of the heart with STIR contrast were generated in a breath-hold period. Blood in the heart chambers was uniformly nulled, and motion artifacts were effectively suppressed. Focal high signal intensity consistent with edema was seen in two patients with acute myocardial infarction; in a third patient, a paracardiac mass was visualized and sharply demarcated relative to normal myocardium. CONCLUSION: Fast STIR imaging of the heart with effective suppression of flow and motion artifacts was implemented. The approach has much potential for high-contrast imaging in a variety of diseases affecting the heart and mediastinum.
机译：目的：开发一种短反转时间反转恢复（STIR）磁共振成像脉冲序列，用于评估相对没有血流和运动伪影的心肌。材料与方法：作者利用预备的射频脉冲实施了屏气，心脏触发的STIR序列，以消除流动血液中的信号。使用具有松弛增强（涡轮自旋回波）读数的分段快速采集，并将恢复恢复延迟调整为零脂肪。该序列在1.0和1.5 T下实施，并在幻影，五名健康志愿者和三名患者中进行了测试。结果：幻像研究证实了该序列的预期行为。在志愿者中，屏气期间产生了带有STIR对比度的心脏脂肪抑制图像。心脏腔内的血液均匀排空，运动伪影得到有效抑制。 2例急性心肌梗死患者可见高信号强度与水肿相一致。在第三例患者中，可见心包旁的肿块并相对于正常心肌清晰地标定了边界。结论：实现了心脏的快速STIR成像，有效地抑制了血流和运动伪影。该方法在影响心脏和纵隔的多种疾病中具有高对比度成像的巨大潜力。

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