Table 5.

Techniques employed by each make and model of scanner for CDTI phantom measurements; axial scan mode and 1 s exposure times were used for all techniques. All technical factors, except for the bowtie filter used by the GE scanners, were consistent between the 16 and 32 cm phantoms. Four techniques were tested per CTDI phantom using each scanner make and model, with the exception of the GE VCT, where two bowties, and thus a total of eight techniques, were tested for the 16 cm CTDI phantom.

Scanner make and model	kVp	mA s	No. of channels	Channel width (mm)	Bowtie (16 cm CTDI phantom)	Bowtie (32 cm CTDI phantom)
GE VCT	80, 100, 120, 140	350	64	0.625	Small, medium	Large
GE LightSpeed 16	80	350	16	1.25	Small	Large
	100, 120, 140	250	16	1.25	Small	Large
Siemens Sensation 64	80, 100, 120, 140	350	24	1.2	Large	Large