Do radiologists read films online now or on those boxes?

Mostly online: Most radiologic examinations - plain x-ray, ct scan, MRI scan - are done digitally and the output can be seen on a video screen without the need to expose or process film. This is more efficient, saves resources and can be easily transmitted to other parts of the country or the world.

Both, mostly digital: We an read online or on viewboxes. Mostly digital these days - can be local networks or via the internet/"cloud.".

Digital: Just like typewriters and CD's the film box is a thing of the past. Radiology is almost exlusively by computer in the US.