问能否获得STEM探测器信号？

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// Create "Scan" parameters for an overview
// This image will stay as survey. Its content is not important
// as you're in TEM mode, but we need it as reference
number paramID
number width    = 1024 // pixel
number height   = 1024 // pixel
number rotation = 0   // degree
number pixelTime= 2   // microseconds
number lSynch   = 0   // no-linesync 
paramID = DSCreateParameters( width, height, rotation, pixelTime, lSynch )

number signalIndex, dataDepth, selected, imageID
signalIndex = 0 // HAADF (most likely) ?
dataDepth    = 4 // 4 byte data
selected    = 1 // acquire this signal
imageID     = 0 // create new image
DSSetParametersSignal( paramID, signalIndex, dataDepth, selected, imageID )

number continuous  = 0 // 0 = single frame, 1 = continuous
number synchronous = 1 // 0 = return immediately, 1 = return when finished

// Capture the "survey" image
DSStartAcquisition( paramID, continuous, synchronous )
image survey := DSGetLastAcquiredImage( signalIndex )
survey.SetName("Survey")
if ( !DSIsValidDSImage( survey ) ) Throw( "Something wrong..")
DSDeleteParameters( paramID ) // remove parameters from memory

// Now we create a "subscan" image for a quasi-stationary beam...
// The size has a minimum size (16x16?) but as we keep the beam 
// "stationary" this will rather define your "time-resolution" of 
// data. Scan 'speed' is taken from our reference...
number sizeX = 1024     
number sizeY = 1024
image Static := IntegerImage( "Static", dataDepth, 0, sizeX, sizeY )
Static.ShowImage()
// defeine "ROI" on the survey. Just the center pixel!
number t,l,b,r
t = height/2
l = width/2
b = t + 1
r = l + 1
DSScanSubRegion( survey, Static, t, l, b, r )