Table 1.

Subjective assessment of comfort and operator convenience of mechanical drivers in cerebral multifrequency MR elastography (mMRE) by 12 healthy volunteers and three operators. Values in parentheses denote the standard deviation (SD) and the range of the values

	Remote actuation	Head cradle
Assessment of discomfort by the volunteer (1, negligible; 5, very uncomfortable)
Vibration	2.1 (0.7; 2–4)	2.9 (0.8; 2–4)
Positioning (constriction, cushions, head pad)	2.4 (1.0; 1–4)	2.8 (0.8; 2–4)
Acoustic noise (relative to the scanner’s gradient system)	1.7 (0.9; 1–3)	2.4 (0.7; 1–3)
Mean score	2.1 (0.4)	2.7 (0.3)
Assessment of effort by three operators (1, no additional effort; 5, hard to implement)
Patient instruction	1, 2, 1	3, 3, 3
Patient positioning	2, 2, 2	3, 3, 2
Actuator set-up	2, 2, 2	2, 2, 2