Is the dose of large-format X-ray photography necessarily larger than that of small-format X-ray photography? Must the dynamic DR dose be greater than the gastrointestinal enhancement dose?

First of all, the dose is a product value, which is the product of current and time. Therefore, when the current is constant, the longer the time, the greater the dose; When the time is fixed, the greater the current, the greater the dose; If the format is large, the dose per unit time will definitely be larger, but the format can reduce the observation time, so the overall dose is smaller. Small-frame gastrointestinal machine, although the dose per unit time is low, but because of the limited frame, the inspection time is longer, but the dose is larger. So this is a dynamic value.