In digital radiography the sensors shape a plate, but in the EOS system, which is a slot-scanning system, a linear sensor vertically scans the patient. Plain radiography was the only imaging modality available during the first 50 years of radiology.
4) Pregnancy. Pregnancy is another of the common causes of swollen feet and ankles. There are three reasons for this: a) the excess weight gained puts more pressure on the legs and feet. b) the expanding uterus can place pressure on the blood vessels for the legs and. c) pregnancy hormones cause the body to retain fluids.
There are a few other causes of foot swelling: a) Obesity: obesity can cause swollen feet and ankles due to the excess weight going through the feet b) Prolonged Standing: standing or walking for long periods can lead to swollen feet and ankles c) Gender: edema is more common in women due to the hormone progesterone which causes fluid retention e.g. swollen ankles before menstruation