Special Construction Requirements
3.1 Radiation Protection and Shielding Requirements
3.1.2 Scan Room Shielding
Discovery NM/CT 670 – Standard Integration Instructions
5483063-1EN, Rev.2, ©2015 GE Healthcare
3-3
3.1.2 Scan Room Shielding
Shielding of the Scan Room includes walls, lead-shielded glass, lead shields, etc. and must be
sufficient to protect staff from unnecessary exposure to radiation. The shielding requirements must
be determined by a qualified radiological health physicist, taking into consideration:
Local regulatory requirements
Facility policy
CT scatter radiation levels within the scanning room (see
Patient location and level of radiation from patients after intake of radionuclides
Equipment placement
Materials used for construction of walls, floors, ceiling, doors, and windows
Weekly projected work-loads (# patient/day technique (kvp*ma))
Access to areas surrounding the Scan Room
Equipment in areas surrounding the Scan Room (for example: film developer, film storage)
Protection of operator room, included leaded window, walls and door
depicts measurable CT radiation levels within the scanning room while scanning
a 32 cm CTDI phantom (body) and a 20 cm water phantom (head), with the technique shown.
The mAs, kV and aperture scaling factors shown in
can be used to adjust exposure
levels to the scan technique used at the site.