PT unit is always shown as SUV even when the value is not in SUV (because meta data is missing)

[pwespi]

Currently the annotations (elliptical, rectangle, probe, maybe others) show SUV as the unit of all PT images (see .e.g. https://github.com/cornerstonejs/cornerstone3D-beta/blob/main/packages/tools/src/tools/annotation/RectangleROITool.ts#L851-L854).

However, not all PT images have the required metadata to convert values to SUV.

https://v3-demo.ohif.org/viewer?StudyInstanceUIDs=1.3.6.1.4.1.25403.345050719074.3824.20170125113417.1

If you inspect the log, you can find:

Error: CorrectedImage must contain "ATTN" and "DECY": NORM,DTIM,RADL,DECY
    at calculateSUVScalingFactors

Error: PatientWeight value is missing. It is not possible to calculate the SUV factors

So in these cases the unit should not be SUV.

Ideally, even if all metadata is present to calculate SUV, the user should be able to select the unit (e.g. if an image is in units Bq/ml, that might be what the user actually wants so see).

PS: Thank you for this great library!

[pwespi]

Before changing any of this, it might make sense to unify the handling of units, see #161

[pwespi]

I'm wondering if the cornerstone tools library is actually the right place to determine the units, since the actual metadata to convert the values is extracted in a different place, e.g. in a OHIF extension.

[pwespi]

closed by #161