Radiology is the branch of medical science which involves a services of test that helps to scan or take pictures of different body parts. Those injuries that can't be seen by naked eyes there we use radiology.
Many medical college offers this course like
AIMS
Delhi University
PGI
They have good career opportunities and also earn well.
For more info


https://www.careers360.com/courses/radiology-course
Cardiac technologist help physician in diagnosis and treatment of heart disorderas. Course involved both theory as well practical. This course has also good career opportunities.
For more info
Visit the link.
https://www.careers360.com/courses/bsc-cardiac-technology

Radiology is more about diagnosis whereas cardiology has operative aspects . Both the courses are equally good and have great contribution towards medical Science. Radiology is more about diagnosis whereas cardiology has operative aspects. ... Radiology is more about diagnosis whereas cardiology has operative aspects.

B.Sc ( Radiography & Imaging Technology - Lateral Entry) | Paramedical Sciences. Radiography is the science of taking images of the internal and hidden portions of the human body for diagnostic purpose Using Ultrasound, X-ray, CT scan, MRI, etc. comes under the realm of Radiography.

There is a good career scope after B.Sc. Cardiology and Salary packages are also not bad. After completing graduation you may find job in Academic Institutes, Pvt./Govt. Hospitals and Clinics, Healthcare Offices, NGOs, Nursing Care Homes, Rehabilitation Centres and many more.