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Table 1: Five-point scoring system for the clinical study
Too Concentrated Optimal Too Dilute
Visibility score +2 +1 0 −1 −2
Needle tip Not visible Borderline Visible Visible Visible
Soft tissue contrast Adequate Adequate Adequate Borderline Not acceptable
	Too Concentrated		Optimal		Too Dilute
Visibility score	+2	+1	0	−1	−2
Needle tip	Not visible	Borderline	Visible	Visible	Visible
Soft tissue contrast	Adequate	Adequate	Adequate	Borderline	Not acceptable