Chapter A - GENERAL & TECHNICAL DATA
Planmeca ProMax A-13
PROMAX 3D: CTDI VALUES
Technical Manual
Dose statements
a)
Default CT scanner conditions of operation in items a) 1- 3 are:
tube voltage: 90 kV (90 kV)
tube current: 10 mA (10 kV)
beam collimation: height = full, width = full (height = full, child patient = off)
exposure mode: normal (normal)
1.
CTDI
100 (centre)
= 9.29 (8.27) mGy
2.
The location of the position where the CTDI
100
at 1 cm interior to the surface of the phantom
is maximum as specified in this item is on the midsagittal line of the imaged volume, posterior
to the axis of rotation.
CTDI
100 (peripheral, max)
= 9.14 (6.30)mGy
3.
90°:CTDI
100 (peripheral, 90°)
= 6.29 (5.06) mGy
180°:CTDI
100 (peripheral, 180°)
= 1.63 (0.94) mGy
270°:CTDI
100 (peripheral, 270°)
= 7.26 (5.48) mGy
4.
The average peripheral CTDI
100
value, CTDI
100 (peripheral)
= 6.08 (4.44) mGy
b)
NOTE Values in this item are normalized to the CTDI
100 (centre)
in item a) 1)
Deviation from the default CT scanner
conditions of operation
Relative CTDI
100 (centre)
Tube voltage: 50 kV 0.04 (0.02)
Tube voltage: 70 kV 0.33 (0.32)
Tube current: 1 mA 0.09 (0.08)
Tube current: 7 mA 0.71 (0.70)
Tube current: 14 mA 1.39 (1.37)
Beam collimation: height = upper 1.27 (1.25)
Beam collimation: height = lower 1.26 (1.24)
Beam collimation: width = half 0.82
Beam collimation: child patient = on 0.96 (0.94)
Exposure mode: low dose 0.21 (0.38)
Exposure mode: high resolution 1.00 (1.00)
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