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Chapter 2
APPENDIX I

CT SCANNER DOSIMETRY DATA

Data are tabulated below for a selection of scanner models relating to typical values of the normalised dose quantities _nCTDI_air and _nCTDI_w, and the factor P_{H or B}, as described in Appendix I to Chapter 1. These illustrative data may be used in the absence of measured data to provide broad estimates of the reference dose quantities for CT. Further data relating to a more comprehensive range of scanners are available in the reference database on CT dosimetry that has been published on the Internet (http://www.efomp.org).

Examples of CT Scanner Dosimetry Data (expressed in terms of absorbed dose to air)

Manufacturer	Model	Applied potential (kV)	Focus-axis distance (mm)	Slice thickness (mm)	_nCTDI_air mGy /mAs	PMMA Head phantom (16 cm diameter)		PMMA Body phantom (32 cm diameter)
Manufacturer	Model	Applied potential (kV)	Focus-axis distance (mm)	Slice thickness (mm)	_nCTDI_air mGy /mAs	_nCTDI_w mGy/mAs	P_H	_nCTDI_w mGy/mAs	P_B
Siemens	AR.HP	130	510	10	0.335	0.252	0.75	0.128	0.38
	Hi Q	133	700	10	0.195	0.161	0.83	0.093	0.48
	Plus S	120	700	10	0.128	0.110	0.86	0.062	0.48
	Plus S	137	700	8	0.161	-	-	0.082	0.51
GE	Pace	120	525	10	0.344	0.200	0.58	0.094	0.27
	Max 640	120	525	10	0.258	0.158	0.61	0.064	0.25
	9800	120	630	10	0.204	0.143	0.70	0.063	0.31
Philips	LX	120	606	10	0.200	0.160	0.80	0.081	0.41
	CX/Q	120	606	10	0.172	0.149	0.87	0.070	0.41
	SR	120	606	10	0.204	0.152	0.75	0.082	0.40
Picker	PQ 2000^a	130	640	10	0.338	0.287	0.85	0.150	0.44
CGR	12000	130	750	10	0.113	0.086	0.76	0.087	0.77

Note:

a.	Full field (Filter 0 used)

For further information see Reference Database on CT dosimetry: http://www.efomp.org