It is usually possible to have a lung CT with breakfast because eating breakfast does not affect the process of having a lung CT or the results of the lung CT. Lung CT is a tomographic scanning technique that can be used to identify specific lesions in the lungs and chest, including infectious lesions, space-occupying lesions, and congenital lesions in the lungs, as well as lesions in the mediastinum and lesions in the ribs. There is no relation to diet when doing a lung CT, and you can still do a lung CT after eating breakfast without affecting the procedure or the results. Fasting is only necessary when doing abdominal CT because after eating breakfast, food will enter the gastrointestinal tract after eating, which will affect the contrast results of abdominal CT to some extent.