Bongartz G, Vestring T, Fahrendorf G, Peters P E
Institut für Klinische Radiologie, Westfälische Wilhelms Universität Münster.
Rofo. 1990 Dec;153(6):669-77. doi: 10.1055/s-2008-1033462.
MRI of the head is routinely performed with spin-echo sequences whereas gradient-echo sequences are still uncommon. Certain features of fast imaging sequences make them a promising tool for clinical investigations. The relative high signal-to-noise ratio/unit time demonstrates the usefulness of GE imaging as localising images. The extremely high contrast-flexibility is sometimes superior to SE imaging and may help to characterise structures and lesions. Flow dynamics are more clearly depicted than with SE sequences and lead to the dynamic evaluation of intracranial motion (CSF flow, blood flow). This information may be used in a special mode to achieve MR angiograms. Due to the very short repetition times, GE sequences are excellently suited to 3D application. This enables to reduce slice thickness to less than 1 mm with optional reconstructions in any virtual direction. In view of present developments in MR, GE imaging will be accepted in clinical diagnostic imaging in the near future.
头部磁共振成像（MRI）通常采用自旋回波序列进行，而梯度回波序列仍不常见。快速成像序列的某些特性使其成为临床研究的一种有前景的工具。相对较高的每单位时间信噪比表明梯度回波（GE）成像在定位图像方面的有用性。极高的对比度灵活性有时优于自旋回波（SE）成像，可能有助于对结构和病变进行特征描述。与SE序列相比，血流动力学的描绘更清晰，从而能够对颅内运动（脑脊液流动、血流）进行动态评估。该信息可用于一种特殊模式以获得磁共振血管造影。由于重复时间非常短，GE序列非常适合三维应用。这能够将层厚减小到小于1毫米，并可在任何虚拟方向进行选择性重建。鉴于磁共振目前的发展情况，GE成像在不久的将来将被临床诊断成像所接受。
