レントゲン写真(の)

X-ray(noun)

(the process of taking) a photograph using X-rays

I'm going to hospital for an X-ray; We'll take an X-ray of your chest; (also adjective) an X-ray photograph.

レントゲン写真をとる

X-ray(verb)

to take a photograph of using X-rays

They X-rayed my arm to see if it was broken.