Cardiac imaging is considered to be coronary angiography. Coronary angiography can be done in patients with a solitary kidney if the kidney function is normal and there are no other contraindications, but it is not recommended if the kidney function is decreased. Coronary arteriography is an X-ray examination in which a guide wire is hooked up to the mouth of the coronary artery from the radial artery or femoral artery and injected with contrast medium. It can be used to visualize the degree of narrowing of the coronary arteries. The contrast medium for coronary angiography needs to be metabolized by the kidneys. If a patient with one kidney has normal renal function, which does not affect the normal discharge of the contrast agent and has no other contraindications, coronary arteriography can be performed; if renal function declines, the contrast agent may aggravate the renal function injury, so it is not recommended. Therefore, whether patients with sole kidney can undergo coronary angiography needs to be judged according to the specific situation. Patients with sole kidney need to check the renal function, renal ultrasound and other items by the doctor to determine whether to perform coronary angiography.