as name implies --Graphy means to draw a drwaing and plasty means repair, clearly indicate the procedure. angio means vessels and graphy means drawing -- angiography is the test by which doctors makes a picture of heart vessels and blockages can be seen while repair of such blocks (--plasty of angio- vessles) is angioplasty which is akind of teeatment.

Angiography is the study of blood vessels whereas Angioplasty is the another name of Balloon catheterisation which is used to remove any plaques in the blood vessels..