Prototype development of an electrical impedance based simultaneous respiratory and cardiac monitoring system for gated radiotherapy

Table 1 Estimated signal-to-noise ratio of signals at different stages of the circuitry implemented

	Injected signal	Current injector output	Band-pass filter output (Exhale)	Band-pass filter output (Inhale)	Low-pass filter output	Respiratory output
Signal-to-noise Ratio	19.63	1.19	28.33	28.61	0.02	3.98

ISSN: 1475-925X