是指图像中可辨认的物体明暗区域最亮的白和最暗的黑之间不同亮度层级的测量， 对比分辨率越高显像越清晰层次感越强。
对比分析了叠前深度偏移、叠后时间偏移和叠前时间偏移结果，分析表明，叠前深度偏移技术能较好地改善该区复杂构造的成像质量，提高资料的信噪比和分辨率。
Analysis of the results suggest that poststack depth migration has more advantages in improving S/N ratio, resolution and image effect than poststack time migration and prestack time migration.
方法用高分辨率彩色多普勒超声诊断47例皮下软组织血管瘤并与病理结果进行对比分析。
Methods The diagnosis of subcutaneous hemangiomas in 47 patients by high resolution ultrasonography were corrected by pathology.
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