Diagnostic value of spiral CT energy spectrum imaging in lymph node metastasis of colorectal cancer

Objectives To evaluate the value of preoperative CT energy spectrum imaging in detecting lymph node metastasis of colorectal cancer. Methods From September 2019 to November 2021, a retrospective study was performed for the eighty-two patients with colorectal cancer through preoperative colonoscopy or surgical pathology confirmed in our hospital. Based on the lymph node metastasis status, these cases were divided into the metastasis and non-metastasis groups. GE Revolution CT scanner was used to scan the patients with energy spectrum imaging, it measured and recorded the single-energy CT values from 40 to 140 keV and various energy spectrum parameters of lymph nodes around the lesions in the arterial and venous phases, and statistically analyze the above indices. Results In the arterial and venous phases: the single-energy CT values of 40–140 keV in the non-metastatic group were higher than those in the metastatic group (all P