Not in the US. In the US the author of the work gets copyright unless it is a "work made for hire".
A work made for hire is either:
1. a work prepared by an employee within the scope of their employment, or
2. a work specially ordered or commissioned for use in one of 9 particular ways [1] and the parties expressly agree in a written instrument signed by them that the work shall be considered a work made for hire.
[1] The 9 are contribution to a collective work, part of a motion picture or other audiovisual work, a translation, a supplementary work, a compilation, an instructional text, a test, answer material for a test, and an atlas.
Either the court or the law is wrong; whether someone is an employee or commissioned to create something doesn't change that someone is obviously paying for whatever's created.
The linked doc might not apply in the case of medical images because the image was captured by a company, not an individual. Although I suppose the company is a corporate person...