EPS 45-80 High-Voltage Generator
1-16
Technical Manual P/N 9894.00.G6
1.2.2.3
High Performance Pulsed Fluoroscopy
This option allows doing Pulsed Fluoroscopy on standard X-ray tubes, with no grid, in Dose
reduction mode or in Image Enhancement mode.
•
Dose Reduction mode:
This mode reduces the total Fluoro dose to the patient by
decreasing the pulse rate operation.
•
Image Enhancement mode:
This mode improves the image contrast at lower Fluoro
speeds by increasing the mAs per pulse, using a programmable mAs factor. When Fluoro
is performed at a pulse rate slower than maximum, the instantaneous Fluoroscopic
entrance exposure rate might be increased by a certain amount (programmable factor).
This feature enhances the image quality without being detrimental to the total
Fluoroscopic entrance exposure rate, as depicted in Table 7.
Table 6-
High Performance Pulsed Fluoro Loading Factors
kV range
40 to 125 kV, in one-kV steps, with programmable kV range.
mAs range
From 0.025 up to 5.0 mAs @ any pulse rate and any kV.
Pulse rate
0.25 up to 30 p/s (7 pulse rates available at the operator console).
Up to 90 p/s with High Frame Rate option.
Table 7-
High Performance Pulsed Fluoro (Typical Setup)
I -Dose Reduction Mode
p/s
Dose to Patient
mAs/min
30
Total dose to patient
(mAs/min)
x
1
15
One half total dose to patient
(mAs/min)
÷
2
10
One third total dose to patient
(mAs/min)
÷
3
7.5
One fourth total dose to patient
(mAs/min)
÷
4
5.0
One sixth total dose to patient
(mAs/min)
÷
6
Reduces the total Fluoro dose
to the patient by decreasing
the pulse rate operation.
3.75
One eighth total dose to patient
(mAs/min)
÷
8
II -Image Enhancement Mode
p/s
Image Enhancement
mAs Factor
30
No
mAs
x 1
15
Yes
mAs
x 2
10 Yes
mAs
x 3
Improves the image contrast
(greater mAs/pulse) at lower
Fluoro speeds using a mAs
correction factor.
7.5 Yes
mAs
x 4
