...医学外文文献 算T2WI和不同b值DWI中病灶信号-噪声比(signal-noise-ratio,SNR),病灶-肝脏对比信噪比(contrast signal-noise-ratio,CNR),不同b值DWI中病灶ADC值,通过观察CT和DSA造影图像,分析病灶内部碘化油沉积、液化坏死和肿瘤..
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The signal to noise ratio (SNR) of tumors, contrast to noise ratio (CNR) and signal intensity ratio (SIR) of tumors and normal liver were calculated and analyzed.
计算不同图像中肿瘤信噪比（SNR）、肿瘤与肝脏对比噪声比（CNR）及信号强度比（SIR）等数据，并进行统计学分析。
Raw thermal images acquired by pulsed thermography(PT) usually have low signal noise ratio(SNR) and temperature contrast.
脉冲热像检测中直接获取的原始热像往往信噪比较低、对比度较差。
The targets SNR(Signal Noise Ratio)and contrast are very low when the target is in the sea background in which there are sea waves and the reflexing light from the stretch welter.
海面背景下海面及连绵起伏的波浪反光使图像的信噪比和对比度都较低，而且舰船目标像素较少。
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