Formulas Flashcards
1
Q
Pixel size
A
DFOV / Matrix size
2
Q
Pitch
A
Table feed per rotation / Beam width
3
Q
Beam width
A
of Detector rows x Detector width
4
Q
Table movement
A
Beam width x Pitch
5
Q
Absorbed Dose (D)
A
D = Joules/kilogram
Gy or mGy
6
Q
Equivalent Dose (EqD)
A
EqD = D x Wr
Sv or mSv
7
Q
Effective Dose (EfD)
A
EfD = D x Wr x Wt
Sv or mSv
8
Q
DLP (Helical)
A
CTDI x scan length
mGy-cm
9
Q
CTDIvol
A
CTDIw / pitch
10
Q
MSAD (Axial)
A
T/I x CTDI
11
Q
MSAD (Helical)
A
CTDI / pitch
12
Q
DLP (Axial)
A
MSAD x slice width (cm) x number of slices in scan volume
13
Q
CBF formula
A
CBV / MTT
14
Q
Effective mAs formula
A
mAs / pitch
15
Q
Beam pitch formula
A
table feed per rotation / total collimation
