Spectral CT was used to prospectively collect medical images and clinical data related to colorectal cancer, evaluate the effect of image quality in the diagnosis of colorectal cancer, and evaluate the application value in the accurate staging of colorectal cancer, so as to provide a more accurate clinical basis for diagnosis, promote the development of individualized treatment, and ultimately improve the prognosis of patients.

Inclusion Criteria:

1. Undergo a contrast-enhanced Quark Spectral CT scan of the lower abdomen/pelvis within 1 week before treatment.
2. Age > 18 years.
3. Patients suspected of having colorectal cancer.
4. Patients who have signed the informed consent form.

Exclusion Criteria:

1. Severe cardiac, pulmonary, or renal insufficiency.
2. Allergy to iodine-based contrast agents.
3. Inability to cooperate with the CT examination.
4. Poor image quality of the Quark Spectral CT scan.
5. Women who are pregnant or breastfeeding.