Radlbauer R, Langenberger K W, Moser E
AG-NMR, Institut für Medizinische Physik, Universität Wien.
Rofo. 1994 Mar;160(3):254-9. doi: 10.1055/s-2008-1032416.
The localisation techniques STEAM and PRESS using echo times of 135 ms were tested for their performance. The selection parameters selection efficiency, contamination and outer volume suppression factor were determined as well as the quality of water suppression and the linearity of signal intensities versus concentrations. Using a voxel size of 2 x 2 x 2 cm3 PRESS localisation showed better values for the selection parameters than STEAM: selection efficiency: 6.0 vs. 4.6%, contamination: 0.70 vs. 3.26%, outer volume suppression factor: 220,000 vs. 60,000. Signal intensities showed good linearity (r2 = 0.9996) with concentrations of more than 10 mM, but below that concentration deviation of more than 10% should be taken into account. Measurements for quality assessment are important to optimise measurement protocols and for estimating the clinical value of in vivo measurements.
对使用135毫秒回波时间的STEAM和PRESS定位技术的性能进行了测试。确定了选择参数，即选择效率、污染和外容积抑制因子，以及水抑制质量和信号强度与浓度的线性关系。使用2×2×2立方厘米的体素大小，PRESS定位在选择参数方面比STEAM表现出更好的值：选择效率：6.0%对4.6%，污染：0.70对3.26%，外容积抑制因子：220,000对60,000。信号强度在浓度超过10 mM时显示出良好的线性关系（r2 = 0.9996），但低于该浓度时应考虑超过10%的偏差。质量评估测量对于优化测量方案和估计体内测量的临床价值很重要。
