Water equivalent diameter (WED) is the preferred surrogate for patient size in computed tomography (CT). It is better than geometric size surrogates and patient weight/height/BMI/age because it correlates the best with x‐ray attenuation. The administration of oral/IV contrast agents increases a patient’s attenuation and should therefore increase WED. Here we study the clinically relevant effect of oral and IV contrast agent on WED.

中文翻译：

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造影剂给药对CT中水当量直径的影响

水等效直径（WED）是计算机断层扫描（CT）中患者体型的首选替代指标。它比几何尺寸替代物和患者体重/身高/ BMI /年龄更好，因为它与X射线衰减最相关。口服/静脉造影剂的给药会增加患者的衰减，因此应增加WED。在这里，我们研究了口服和静脉造影剂对WED的临床相关作用。