我认真的查了一下uptodate就肾石检测是这么说的： “Ultrasound is less sensitive and demonstrates greater diagnostic variability than CT of the abdomen and pelvis without contrast for the diagnosis of nephrolithiasis. Ultrasound detects 24 to 57 percent of stones seen with CT [76,77]. Consequently, a CT is sometimes performed after a negative ultrasound to evaluate for a stone if the index of clinical suspicion remains high. Ultrasound is less accurate than CT at measuring stone size and defining ureteral location. Thus, a positive ultrasound often leads to a follow-up CT to enable treatment planning. Ultrasound has been compared with standard-dose abdominopelvic CT for diagnostic performance and cumulative population-level radiation dose. A multicenter trial of 2759 emergency department patients clinically suspected to have nephrolithiasis were randomly assigned to initial imaging with a standard-dose, noncontrast CT, ultrasound performed by a radiologist, or ultrasound performed at the bedside by an emergency (more...)