The diagnosis of tuberculosis currently relies on two main means, one is the examination of sputum tuberculosis bacteria and the other is the chest X-ray. When tuberculosis bacteria invade the body, they often cause lesions in the lungs due to massive multiplication, at which time the multiplying tuberculosis bacteria, as well as the necrotic lung tissue after destruction, are coughed up with the sputum. When this sputum is stained, it is possible to detect the presence of tuberculosis bacteria in the sputum and diagnose tuberculosis (called bacillary-positive tuberculosis). However, there are also a significant number of patients who also have lesions in the lungs, but for various reasons, such as incorrect sputum retention methods and too small amounts of bacteria, no tuberculosis bacteria can be detected. These patients can be diagnosed with tuberculosis (known as bacillus-negative tuberculosis) by taking a chest X-ray and finding images of lungs destroyed by tuberculosis bacteria.