CT and MRI have different imaging principles, so the scope and focus of the tests are different. For lesions of the lungs and skeletal system, CT is more accurate, while for lesions of the breast, head, or soft tissues, MRI is usually more accurate. For abdominal lesions, the accuracy of both diagnoses is similar. Usually, the nature of the lesion cannot be clarified by ordinary examinations, and after CT and MRI, the patient may need further enhanced imaging examinations to clarify the diagnosis.