The figures given assume a properly maintained and operated machine though. There's a reason medical x-ray machines are required to have properly trained personnel and a very strict maintenance regime. Also riding around in the back of a van doesn't sound like the best place to keep a carefully calibrated machine working in top shape. What happens when they hit a pothole?

How well people deal with emergency situations varies hugely. This system would prioritise a 5 year old ringing about a huge splinter she just got over a military veteran reporting a 3 car pileup with limbs everywhere. Can't beat human judgement in a job as important as this.