Table 1.

Nominal technical settings and measured HVLs for each imaging protocol investigated.

Scan Site	XVI			OBI
	Head	Chest	Pelvis	Head	Chest	Pelvis
kV Collimator	S20	M20	M10	‐	‐
kV Filter a	F0	F1	F1	Full bow‐tie	Half bow‐tie	Half bow‐tie
kVp	100	120	120	100	110	125
mA	10	40	64	20	20	80
ms/projection	10	40	40	20	20	13
# of Projections	361	643	643	360	655	655
Total mAs	36.1	1028.8	1646.1	145	262	680
Meaured HVL (mm Al)	5.9	8.9	8.9	5.4	5.7	6.4
Acquisition Angle b	350°‐190°	273°‐269°	273°‐269°	88°‐292°	88°‐92°	88°‐92°
	cw	cw	cw	cw/ccw	cw/ccw	cw/ccw
Acquisition Time	$~70\hspace{0.17em}\mathrm{s}$	$~120\hspace{0.17em}\mathrm{s}$	$~120\hspace{0.17em}\mathrm{s}$	$~30\hspace{0.17em}\mathrm{s}$	$~60\hspace{0.17em}\mathrm{s}$	$~60\hspace{0.17em}\mathrm{s}$
Axial Field of View (cm)	27	41	41	25	45	45
Long. Field of View (cm)	26	26	12.5	18	16	16

^a.On the XVI, F0 is the designation for no filter and F1 is the designation for a full bow‐tie filter.

^b.For acquisition angle, cw means clockwise and ccw means counter‐clockwise, as viewed from the patient table.