Mechanical system

Electrical system

Advantages

1.     Easy to incorporate 

        interventional devices.

2.     Could have NO acoustic dead

        zone

1.     Has a smaller catheter

2.     Very flexible (because of no   

        rotating element)

3.     Easy to access smaller vessels
   and make turns

4.     Do not have non-uniform rotation

5.     Relatively less expensive

Disadvantages

1.     Has a larger catheter

2.     Has a stiffer shaft (because of

        rotating element)

3.     Hard to make turns without

        guiding catheter

4.     Has non-uniform problem

5.     Relatively complicated design

6.     Relatively expensive

1.     Hard to incorporate interventional
   devices.

2.     Has a larger and considerable

        acoustic dead zone