I am a student at VIT, pursuing my bachelors in IT. We are researching on a topic i.e. LUNG CANCER DIAGNOSIS I wanted to know how does a doctor come to know that a person has cancer when he is provided with the chest CT scan? How long does it take for the doctor to detect malignant nodules/tumors in the CT scan and conclude the stage of cancer? This is for a research topic, in which we are trying to automate the task of detecting a nodule/tumor in lung through the patient's CT scan. Thank you.