对比噪声比
对比度
图像均匀度
空间分辨率
信噪比
SNR增加的是()
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信噪比的错误概念是()A、适当延长TR后使信号增强B、TE愈长,T2信号愈弱,SNR越低C、TI增加,SNR也增大D、表面线圈比体线圈SNR高E、场强越高信噪比越低
X射线管的功率不变,观测视野一定,提高X-CT的空间分辨力,图像的信噪比SNR及噪声N将如何变化().A、SNR↑N↑B、SNR↑N↓C、SNR↓N↓D、SNR↓N↑
In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?()A、the signal to noise of the current optical amplifierB、the signal to noise of the previous amplifier or sourceC、the signal to noise introduced by the optical multiplexerD、the accumulated noise to signal ratio of the optical channel
SNR:()
信噪比测试中一般要求SNR大于().
单选题信噪比的错误概念是()A 适当延长TR后使信号增强B TE愈长,T2信号愈弱,SNR越低C TI增加,SNR也增大D 表面线圈比体线圈SNR高E 场强越高信噪比越低