University Medical Centre Utrecht, Department of Radiotherapy, the Netherlands.
NMR Biomed. 2011 May;24(4):358-65. doi: 10.1002/nbm.1599. Epub 2010 Oct 19.
An endorectal coil and an eight-element microstrip array were compared for prostate imaging at 7 T. An extensive radiofrequency safety assessment was performed with the use of finite difference time domain simulations to determine safe scan parameters. These simulations showed that the endorectal coil can deliver substantially more B(1)(+) to the prostate than can the microstrip array within the specific absorption rate safety guidelines. However, the B(1)(+) field of the endorectal coil is very inhomogeneous, which makes the use of adiabatic pulses compulsory for T(1) - or T(2) -weighted imaging. As a consequence, a full prostate examination is only possible in a feasible amount of time when the microstrip array is used for T(1) - and T(2) -weighted imaging, whereas the endorectal coil is required for spectroscopic imaging. The pulse parameters were optimised within the specific absorption rate guidelines and thereafter used to provide a good illustration of the possibilities of prostate imaging at 7 T.
在 7T 下，比较了直肠内线圈和 8 单元微带阵列在前列腺成像方面的性能。使用有限差分时域模拟进行了广泛的射频安全评估，以确定安全的扫描参数。这些模拟表明，在特定吸收率安全指南内，直肠内线圈可以比微带阵列向前列腺提供更多的 B(1)(+)。然而，直肠内线圈的 B(1)(+)场非常不均匀，这使得在 T(1)或 T(2)加权成像时必须使用绝热脉冲。因此，当使用微带阵列进行 T(1)和 T(2)加权成像时，只有在可行的时间内才能进行完整的前列腺检查，而直肠内线圈则用于光谱成像。在特定吸收率指南内优化了脉冲参数，然后用于很好地说明在 7T 下进行前列腺成像的可能性。
