Medical Technology Questions

Ultrasound of how much frequency is beamed into human body for sonography?

Which two of the following statements about biomedical technologies are correct?(a) During open heart surgery, blood is circulated in the heart-lung machine.(b) Blockage in coronary arteries is removed by angiography.(c) $\text{CAT}$ shows detailed internal structure as seen in a section of the body.(d) X-ray provides detailed images of soft organs like the prostate gland.