Most people have the experience of going to the hospital to take pictures with a 500ma sickle arm X-ray machine. Many doctors will operate a 500ma sickle arm X-ray machine when changing patients, and then call the patient in, or stand or lie down to take pictures. What is the doctor adjusting the 500ma sickle arm X-ray machine? In fact, the doctor adjusts the kv or ma of the machine, and also sets the exposure time, because many machines can set automatic exposure. Of course, some doctors choose manual exposure after adjusting the kv or ma. What is the exposure time for the 500ma sickle arm X-ray machine to film the patient? In fact, this time is not fixed. If the set kv and ma are larger, the exposure time will be shorter, if the kv and ma are smaller, the exposure time will be longer. Also, if the patient is large, the exposure time is relatively long, if the patient is small or a child, the exposure time is short, generally between 0.1s and 4s.