Table 2.

User assessment of essential interactions of the VR system in terms of ease of learning and ease of use. All interactions were considered easy or very easy by the majority of participants, with none finding them very difficult.

		Very Difficult	Somewhat Difficult	Easy	Very Easy
Learning	Volume	0	1	4	8
	Cropping	0	0	6	7
	Landmarks	0	0	6	7
	Windowing	0	1	7	5
	Overall	0	1	5	7
Use	Volume	0	1	3	9
	Cropping	0	0	5	8
	Landmarks	0	1	5	7
	Windowing	0	2	6	5
	Overall	0	0	6	7