Medical & biological engineering & computing
-
Med Biol Eng Comput · May 2001
Error analysis of a natural breathing calibration method for respiratory inductive plethysmography.
Respiratory volumes are measured non-invasively by recording rib cage and abdominal motions using respiratory inductive plethysmography (RIP). Qualitative diagnostic calibration (QDC) of RIP is based on the natural variability in the relative rib-cage-to-abdomen contribution during tidal breathing. ODC does not require subject cooperation but it has previously been shown that accuracy may deteriorate when breathing pattern changes. ⋯ The PRA calibration factors were within 6% of those from REF, while the QDC rib-cage factor was underestimated by 15% and the abdominal factor was overestimated by 38%. Small natural variability in the relative rib-cage-to-abdomen contribution was related to poor accuracy. Each compartment's variability depended on its magnitude, which is a violation of the QDC assumptions.