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首页> 外文会议>Conference on Medical Imaging 2008: Physics of Medical Imaging; 20080218-21; San Diego,CA(US) >Evaluation of the partial flip angle spin echo method to improve non-uniformity in T1-weighted imaging with the 3-tesla MRI
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Evaluation of the partial flip angle spin echo method to improve non-uniformity in T1-weighted imaging with the 3-tesla MRI

机译：评估部分翻转角自旋回波方法以改善3-tesla MRI在T1加权成像中的不均匀性

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The higher signal-to-noise ratio (SNR) of 3-Tesla magnetic resonance imaging (3T MRI) contributes to an improvement in the spatial and temporal resolution. However, T1-weighted images of the brain obtained by the spin-echo (SE) method using 3T MRI are unsuitable for clinical use because of the inhomogeneity of the radio frequency (RF) field B1 non-uniformity. And it is clear by SE method. In addition, the prolongation of the longitudinal relaxation time (Tl) of most tissues leads to a decrease in the Tl contrast. Therefore, many hospitals that utilize 3TMRI use the GRE method instead of the SE method in order to obtain an adequate Tl contrast, as can be obtained using FLASH (fast low angle shot), and high uniformity of images. Further, many studies have been performed to improve the non uniformity using techniques such as spatial presaturation . However, when filters are used, the high intensity of the influence in susceptible regions, signal deficits, and original contrast are lost, and a distortion can be clearly observed when the GRE method is used. Therefore, we obtained the T1-weighted images by using the partial flip angle SE method instead of the GRE method or SE method We attempted to improve the image non-uniformity by using the partial flip angle SE method. Using this method, we could improve the image uniformity and also realize an adequate T1 contrast. As a result, the uniformity was found to improve by 6% and it became 82.6% at 110° These results indicate that the use of the partial flip angle SE method is effective for obtaining adequate uniformity in the T1-weighted images of the brain.
机译：3-特斯拉磁共振成像（3T MRI）的较高信噪比（SNR）有助于提高空间和时间分辨率。但是，由于射频（RF）场B1的不均匀性，通过使用3T MRI的自旋回波（SE）方法获得的大脑的T1加权图像不适合临床使用。并且通过SE方法很清楚。另外，大多数组织的纵向松弛时间（T1）的延长导致T1对比度的降低。因此，许多利用3TMRI的医院使用GRE方法而不是SE方法来获得足够的T1对比度，如使用FLASH（快速低角度拍摄）所获得的，以及图像的高均匀性。此外，已经进行了许多研究以使用诸如空间预饱和的技术来改善非均匀性。然而，当使用滤波器时，在敏感区域，信号缺陷和原始对比度的影响的高强度消失了，并且当使用GRE方法时可以清楚地观察到失真。因此，我们通过使用部分翻转角SE方法而不是GRE方法或SE方法获得了T1加权图像。我们试图通过使用部分翻转角SE方法来改善图像的不均匀性。使用这种方法，我们可以改善图像均匀性，也可以实现足够的T1对比度。结果，发现均匀性提高了6％，在110°时达到了82.6％。这些结果表明，使用部分翻转角SE方法可以有效地获得T1加权大脑图像的足够均匀性。

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