Operator's Manual

www.masimo.com 31 Masimo
Chapter 1: Technology Overview
The following chapter contains general descriptions about parameters,
measurements, and the technology used by Masimo products.
Signal Extraction Technology (SET)
Masimo Signal Extraction Technology's signal processing differs from that
of conventional pulse oximeters. Conventional pulse oximeters assume
that arterial blood is the only blood moving (pulsating) in the
measurement site. During patient motion, however, the venous blood also
moves, causing conventional pulse oximeters to read low values, because
they cannot distinguish between the arterial and venous blood movement
(sometimes referred to as noise).
Masimo SET® pulse oximetry utilizes parallel engines and adaptive
filtering. Adaptive filters are powerful because they are able to adapt to
the varying physiologic signals and/or noise and separate them by
looking at the whole signal and breaking it down to its fundamental
components. The Masimo SET® signal processing algorithm, Discrete
Saturation Transform® (DST®), in parallel with Fast Saturation Transform
(FST
®
), reliably identifies the noise, isolates it and, using adaptive filters,
cancels it. It then reports the true arterial oxygen saturation for display on
the monitor.