Very different. "Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in trans

Very different. "Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in transmission through the target. In contrast, backscatter X-ray detects the radiation that reflects from the target. It has potential applications where less-destructive examination is required, and can be used if only one side of the target is available for examination." from Wikipedia. http://en.wikipedia.org/wiki/Backscatter_X-ray http://en.wikipedia.org/wiki/Backscatter_X-ray