Dear Sampath ,

B.Sc in Cardiac Technology(basically cardiovascular technology) is a 3 year undergraduate course that is about study of heart disease and peripheral vascular conditions .

While , B.Sc radiology is a 3 year undergraduate course that is about to study of malfunction in different parts of bodies by scanning .

The scope for both of these courses are good as both of two are equally important in medical field . Radiology course is much wider than cardiac technology as in Radiology , you have to gain the knowledge of diagnosis of different internal parts of body.

Refer to these two links to know more about these courses :

https://www.careers360.com/courses/cardiovascular-technology-course

https://www.careers360.com/courses/radiology-course

Hope this information helps !