Table 1 Concept of methods to correct for Ph error
Method | Calculation approach | Measured parameter | Measurement principle | Diagram | Form factor | Effective Ph correction |
|---|---|---|---|---|---|---|
Height correction unit31 (Finapres NOVA, Edwards Clearsight) | Analytical | Finger height relative to the heart | Measure pressure signal in fluid-filled tube; relate pressure signal to measurement height |
| − (obtrusive tube) | + (accurate with any arm orientation) |
Inertial forearm orientation tracking78 | Analytical | Parameterized forearm-arm orientation | Measure forearm orientation |
| + (simple, unobtrusive IMU) | − (only accurate with straight arm) |
Inertial full-arm orientation tracking (this work) | Machine learning | Parameterized upper arm and forearm orientation | Measure forearm orientation and acceleration; predict upper arm orientation using deep learning |
| + (simple, unobtrusive IMU) | + (accurate with any arm orientation) |
