Vatech A9 (PHT-30CSS)
Technical manual
VDH-TeM-098
125 / 214
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Step 1. Check if the left cutting pixel at the middle position is 2 pixels.
Apply Threshold 70% and check whether the number of pixels cut based on the left of the
average projection at the middle position is 2 pixels.
(Left Cutting Pixel of Average Projection at Middle Position = Collimator Align Left Cutting
Pixel)
Projection position
Projection range
Beginning
87
387
Middle
1524
1624
End
2820
3120
▲
Average projection calculation range according to Projection
position
The standard of the number of cutting pixels is measured as
follows.
1. Go to x=0, y= 343 at the middle position of projection.
2. If more than half of the cutting area (indicated in red) appears in
each x value, it is 1 pixel. If not, it is 0 pixel.
3. For example, in the picture on the right below, 6 cutting areas
are displayed in red at x=1, so a total of 2 pixels are cutting areas.
▲
Cutting Pixel calculation
If the left cutting pixel at the middle position does not satisfy the 2 pixels, perform the
following operation.
* Send the [SPM_CPIO_0XXXX] command to move the collimator so that it is located at
the recommended standard.
Command
Function
[SPM_CPIO_0XXXX] When the value increases, the number of Projection Left Cutting
Pixels increases.
[SPM_CPIO_1XXXX] When the value increases, the number of Projection Left Cutting
Pixels decreases.
*. It moves by 1 pixel for every 5 CPIO values.
( [SPM_CPIO_00000] = Default value)
▲ T
he trend of Left Cutting Pixel according to CPIO value
