If you have metal in your body and undergo a CT scan, it can interfere with the CT images. Metal can block the X-rays used in the CT scan, causing distorted or unclear images. This can make it difficult for the radiologist to interpret the images and make a diagnosis. In some cases, the presence of metal can also cause the CT machine to malfunction. It is important to inform your healthcare provider about any metal in your body before undergoing a CT scan, so that they can take appropriate precautions and ensure the safety and accuracy of the scan.