Siemens EMOTION 16-Jun - Manual (Page 49)

Dose Information
49
How does CARE Dose 4D work?
CARE Dose 4D combines two types of tube current
modulation:
1) Axial tube current modulation:
Based on a single Topogram (a.p. or lateral) the atten-
uation profile along the patient’s long axis is measured
in direction of the projection and estimated for the per-
pendicular direction by a sophisticated algorithm.
Example of lateral and a.p. attenuation profile evalu-
ated from an a.p. Topogram.
Based on these attenuation profiles, axial tube current
profiles (lateral and a.p.) and the resulting eff. mAs for
every table position are calculated. The correlation
between attenuation and tube current is defined by an
analytical function which results in an optimum dose
and image noise in every slice of the scan.
A
tt
e
nu
at
io
n (l
o
g
)
Lateral
Scan Range