Table A2.

List of operators related DEVICE measurements.

DEVICE Metrics	Description	Controllable
$R$	Patient’s transverse axis (x) rotation with respect to the transverse axis of exam table in the transverse plane	Yes
$H$	Patient’s long axis (y) rotation with respect to the table’s long axis in the horizontal plane	Yes
$E$	Patient’s long axis (y) rotation with respect to the table’s long axis in the sagittal plane	Yes
$\beta$	Probe axial angle, angle between the probe’s long axis and $z$-axis	Yes
EA	Probe Euler angles (roll, pitch, yaw)	Yes
$\alpha$	Probe orientation angle, i.e., angle between the probe’s short axis and the y-axis projected in the xy plane	Yes
P3DDN	Probe head center point 3D distance to nipple $\left|OP\right|$	Yes
P2DNN	Probe head center point distance to nipple projected in xy plane (2D) $\left|{OP}^{\prime }\right|$	Yes
P_ratio	Ratio between probe 3DNN and probe 2DDN	Yes
P_height	Distance from probe center point to nipple in z axis $\left|{PP}^{\prime }\right|$	Yes
P_CFP	Probe clockface position, i.e., angle $\widehat{P^{\prime }ON}$	Yes