Scan Room Shielding - GE Discovery NM/CT 670 Instructions Manual

Special Construction Requirements

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

Figure 3-1, p.3-5
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
levels to the scan technique used at the site.
Discovery NM/CT 670 – Standard Integration Instructions
5483063-1EN, Rev.2, ©2015 GE Healthcare
depicts measurable CT radiation levels within the scanning room while scanning
3.1 Radiation Protection and Shielding Requirements
Figure 3-1,
Table 3-1, p.3-4
3-3
3.1.2 Scan Room Shielding
p.3-5)
can be used to adjust exposure