Table 4. Figure-of-Merit Values Obtained from JAFROC Analysis.

Observer	Modality
	FBP	ASIR	SCT
1	0.717	0.823	0.846
2	0.632	0.785	0.808
3	0.742	0.785	0.946
4	0.612	0.726	0.750
5	0.709	0.742	0.753
Average	0.682	0.772	0.821

ASIR = adaptive statistical iterative reconstruction, FBP = filtered back projection, JAFROC = jackknife alternative free-response receiver operating characteristic, SCT = standard-dose CT