ABSTRACT
Several clinically relevant properties of the ultrasound imagesuch as the resolution, depth of penetration, and attenuation of the acoustic-are dependent on the geometric and frequency properties of the transducer. The higher the center frequency, the better the axial resolution, but the lower the depth of penetration. For coronary imaging because the transducer is close to the vessel wall, high ultrasound frequencies are used that are centered at 20 to 45 MHz (4). Axial resolution is typically 80 to 120 mm, and lateral resolution is typically 100 to 250 mm (3).
