Table 1:

Seven sets of CT parameters used in the CT examinations. All sets used the same common settings for clinical coronary protocol stated in the body of the text. Only the listed parameters in the table columns were varied among 7 sets. All reconstructions were performed with the standard GE reconstruction software with ASiR-V=50%. Focal spot size = 1.0 × 0.7mm for Small, and 1.6 × 1.2mm for Large, and 2.0 × 2.1mm for Extra Large.

Set No.	Tube energy (kV)	Tube current (mA)	focal spot size (mm)	Reconstruction kernel	CTDIvol (mGy)	Marker in the plot
1	100	640	Large(L)	Standard(std)	4.69	□
2	100	640	Large(L)	Bone	4.69	+
3	100	645	Extra Large(XL)	Bone	4.60	*
4	100	420	Small(S)	Bone	3.11	×
5	120	350	Small(S)	Standard(std)	4.12	◇
6	100	420	Small(S)	Standard(std)	3.11	△
7	80	580	Small(S)	Standard(std)	2.11	◁