Step 12 Orientation and Calibration of Metrics

Once the model has been created, it needs to be oriented properly with respect to the instrument/tracking devices. The metrics also need to be properly calibrated.

Orientation and calibration can be accomplished using in vivo or ex vivo techniques. One example of an in vivo technique involved the calibration of irrigation flow for the UW transurethral resection of the prostate simulator, in which flow rates in and out of the bladder under different stopcock settings and scope diameters were recorded with a uroflowmeter. An example of an ex vivo technique involved the calibration of blood loss with the UW transurethral resection of the prostate simulator, where bleeding movies were quantified and captured under different fluid flow states (30).

When at all possible, it is important to try and avoid relying on subjective calibration of metrics, even from the most experienced subject matter experts. Haptics calibration is notoriously unreliably consistent between subjects.

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