Magnetic resonance imaging of the upper abdomen using a free-breathing T2-weighted turbo spin echo sequence with navigator triggered prospective acquisition correction
Magnetic resonance imaging of the upper abdomen using a free-breathing T2-weighted turbo spin echo sequence with navigator triggered prospective acquisition correction
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DOI：
10.1002/jmri.20293
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发表时间：
2005-05-01
影响因子：
4.4
通讯作者：
Taupitz, M
中科院分区：
文献类型：
--
作者：
Klessen, C;Asbach, P;Taupitz, M
目的：与常规T2加权TSE(T2w-CTSE)、单次激发TSE(T2w-HASTE)和T1加权梯度回波序列(T1w-Flash)比较，评价自由呼吸导航仪触发T2加权T2w-PACE序列(T2w-PACE-TSE)在上腹部MRI中的应用价值。材料和方法：对40例上腹部MRI患者在1.5T进行自由呼吸T2w-PACETSE、自由呼吸T2w-CTSE、屏气T2w-HASTE和T1w-Flash扫描。由三位放射科医生对图像进行定性评估，包括运动伪影、肝脾对比、肝内血管、胰腺和肾上腺的描绘，以及总体图像质量(四分制)。结果：与T2w-CTSE和T2w-HASTE序列相比，T2w-PACE-TSE对肝内血管的显示和清晰度明显提高(P<；0.01)。T2w-PACE-TSE图像的对比度明显高于T2w-CTSE、T2w-HASTE和T1w-Flash图像(P<；0.01)。T2w-PACE-TSE的平均检查时间为7.91min，T2w-CTSE序列的平均采集时间为4.52min。结论：前瞻性采集校正是减少上腹部T2w-TSE序列呼吸运动伪影的有效方法。与T2w-CTSE和T2w-HASTE序列相比，T2w-CTSE和T2w-HASTE序列的解剖细节识别和对比度都有显着提高。
Purpose: To evaluate a free-breathing navigator triggered T2-weighted turbo spin-echo sequence with prospective acquisition correction (T2w-PACE-TSE) for MRI of the upper abdomen in comparison to a conventional T2-weighted TSE (T2w-CTSE), a single-shot TSE (T2w-HASTE), and a T1-weighted gradient-echo sequence (T1w-FLASH).Materials and Methods: A total of 40 consecutive patients were examined at 1.5 T using free-breathing T2w-PACETSE, free-breathing T2w-CTSE, and breath-hold T2wHASTE and T1w-FLASH acquisition. Images were evaluated qualitatively by three radiologists regarding motion artifacts, liver-spleen contrast, depiction of intralrepatic vessels, the pancreas and the adrenal glands, and overall image quality on a four-point scale. Quantitative analysis of the liver-spleen contrast was performed.Results: Depiction and sharpness of intrahepatic vessels were rated significantly better (P < 0.01) using T2w-PACE-TSE compared to T2w-CTSE and T2w-HASTE sequences. Significantly higher contrast values were measured for T2w-PACE-TSE images compared to T2w-CTSE, T2w-HASTE, and T1w-FLASH images (P < 0.01). Mean examination time of the T2w-PACE-TSE was 7.91 minutes, acquisition time of the T2w-CTSE sequence was 4.52 minutes.Conclusion: Prospective acquisition correction is an efficient method for reducing respiratory movement artifacts in T2w-TSE imaging of the upper abdomen. Compared to T2w-CTSE and T2w-HASTE sequences recognition of anatomical details and contrast can be significantly improved.