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#1 Posted : Friday, July 3, 2009 5:42:26 AM(UTC)


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According to information read in other messages, it seems that the AnnotationRuler is calibrated according to the DPI of the image. Do I understand it correctly?

Is it in no way possible to allow a user to calibrate the ruler by using calibration information in the DICOM tags? (i.e. when the image contains a part of which the actual size is known - let us name it part A - we would like to calibrate the ruler in order to estimate the size of other parts in the image relevant to the known size of part A. Is this possible?)

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#2 Posted : Friday, July 3, 2009 6:18:35 AM(UTC)


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Yes, the ruler object is originally calibrated to the image's DPI. 

If your Dicom file has the Pixel Spacing tag, we will use that to calculate the DPI when returning the image from the GetImage function.  If the calibration you want is something other than Pixel Spacing, the PixelSpacing value is incorrect, or the tag doesn't exist, then you can manually calibrate the annotation. 

First you have to draw the ruler, then right-click on it's properties and click the Calibrate button on the ruler tab.
#3 Posted : Tuesday, July 28, 2009 10:21:38 PM(UTC)


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We have a scenario where we removed the PixelSpacing tag but found that the ruler still defaults to some value in centimeters (even before we manually calibrated the ruler). Can you please explain how this is done? On what basis is the DPI calculated when the PixelSpacing tag is missing?
#4 Posted : Wednesday, July 29, 2009 6:34:42 AM(UTC)

Adnan Ismail  

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If the DPI information is missing from your images, LEADTOOLS will always load these images at 150 DPI.
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