Qin S, et al. - The performance of contrast-enhanced ultrasound (CEUS) utilizing high-frequency linear and convex probes in the detection of small colorectal liver metastases (CRLMs) is compared in this study. For patients with a high risk of CRLMs and those after chemotherapy, they prescribe first scanning the liver by utilizing a convex probe and subsequently screening the surface area of the liver and suspicious small lesions by utilizing a linear probe.