D670 Shielding Requirements Scaling - GE Discovery NM/CT 670 Instructions Manual

Special Construction Requirements
NOTE
Actual measurements can vary. All measurements have an accuracy of ±20% because of measurement equipment,
technique, and system-to-system variation. Use the correction factors shown in
levels to the usual scan technique at your site.
Table 3-1: D670 Shielding Requirements Scaling
Changed Parameter
120 kV
140 kV
16 x 0.625 LD
8 x 1.25 LD
4 x 2.5 LD
Fluro 5mm
4 x 1.25 LD
5 mm (1i)
Fluro 2.5 mm
1 x 1.25 mm images
2 x 0.625 LD
1 x 1.25
4 x 3.75 mm images
Discovery NM/CT 670 – Standard Integration Instructions
5483063-1EN, Rev.2, ©2015 GE Healthcare
Multiplication Factor
mAs new mAs/100
80 kV
3.1 Radiation Protection and Shielding Requirements
Note: The units of measure used for radiation levels
0.21
0.71
1.0
0.59
0.40
0.20
0.10
0.82
3-4
3.1.2 Scan Room Shielding
Table 3-1, p.3-4 to adjust exposure
have been changed in this document, from
mR (millirads) to Gy (micrograys).

The conversion factor is:
1 mR = 8.69
Gy