Читать книгу Interventional Cardiology - Группа авторов - Страница 206

Two different transducer designs are commonly used yielding comparable information: mechanically rotated and electronically activated phased‐array. Mechanical probes use a drive cable to rotate a single‐element transducer at the tip of the catheter at 1800 rpm.

At approximately 1° increments, the transducer sends and receives ultrasound signals providing 256 individual radial scan lines for each image. The mechanical transducer has the advantage of a simple design, greater signal‐to‐noise ratio, and higher temporal and spatial resolution. In electronic systems, multiple tiny transducer elements in an annular array are activated sequentially to generate the cross‐sectional image [4–6].

The IVUS console contains numerous imaging controls such as zoom, gain, TGC (time‐gain‐compensation), gamma curves, compression and reject, and others. With both systems, still frames and video images can be digitally archived on local storage memory or a remote server using DICOM format.