Hi Michael
We regularly use HU from DICOM images in ImageJ. Provided the
calibration table is properly set, pixel values will be reported as HU
(raw values in parentheses) in the status bar , e.g. -1000 (0), 0
(1000). This is done without changing the actual pixel values; there is
just a calibration function that does the conversion live. It's possible
your calibration table is not being set properly, which may be due to
lack of support for your particular DICOM headers. You can also try
Analyze > Calibration, but this is probably overkill when you know what
your grey->HU conversion should be.
Michael
On 10/09/10 21:21, Taylor, Michael wrote:
> When importing DICOM images, the pixel value is not normalized the CT
> scanners HU (Hounsfield Unit) scale. By looking at the DICOM header it's
> possible to figure out the scale. But when using the Math pull down and
> setting an offset to the pixel scale, the analysis will not allow a
> value of less than one. Anybody know how to set up ImageJ for reading
> HU's?
>
>
>
> Michael Taylor, M.S.
>
> Director of Medical Physics& Radiation Safety Officer
>
> Inova Fairfax Hospital
>
> 3300 Gallows Road, Falls Church Va 22042
>
> 703.776.3705
>
>
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