Consider the following statements about biomedical technologies A....

It is almost impossible to repair intracardiac defects surgically while, the heart is still pumping. Therefore, many types of artificial lung machines have been developed to take the place of heart and lungs during the course of operation. Angiography is radiographic visualization of blood vessels of a region/organ after injecting a radio-opaque/contrast agent computerised axial tomography (CAT) shows detailed internal structures as seen in a section of body (eg, iodine) or fluorsocopic chemical. Digital subtraction angiography is an imaging technique that produces clear views of flowing blood in vessels and indicates the presence of blockage. $\mathrm{X}$-rays have a remarkable ability to penetrate materials, which do not transmit visible light. X-rays imaging is commonly employed for diagnosing disease of heart, lungs and bones.