Threshold and hounsfield unit inclusion

Support
1

Operating system: Windows 10
Slicer version: 4.1.1.

Hello,
I am using threshold method to measure ROI. A question came up if the threshold is set at -30, is -30 included or does the inclusion of values start from -29?

2

The threshold range is inclusive on both sides.

Note that 1 HU is such a small difference that it should not matter either way. For example, magnitude of image noise typically tens of HU.

3

Thank you for the information. Knowing the noise level is very helpful.