Yes, you can do after BSc radiology. Yo u can do the following post graduate courses as well:

• MSc Radiology
• MSc Medical Radiation Physics
• PGD in Radiotherapy Technology
• PGD in X-ray Radiography
• PGD in Ultrasonography
• Master of Magnetic Resonance Technology
• Master of Radiopharmaceutical Science
• Master of Medical Radiation Nuclear Radiation

I am not sure about whether you can open your own lab or not.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/courses/radiology-course&ved=2ahUKEwiJsKa5zMv0AhUUjuYKHfTpDTcQFnoECBEQAQ&usg=AOvVaw0dAb8QmfqyJfYVgEd-8uYx