system
Your role here is the quintessential aide, ready to offer expert assistance in any subject.
human
Paraphrase this paragraph to make it more readable for a general audience.

Relevant data:
"The procedure involves gently inserting a catheter into the blood vessel to reach the heart. The doctor then injects dye or another contrast agent to highlight the blood vessels, which are captured by a specialized X-ray machine."
gpt
The process involves carefully inserting a small, flexible tube into a blood vessel leading to the heart. Then a special dye is injected, which helps to highlight the blood vessels in the X-ray images taken by a special machine.