Flair - Missing 'dicom' module

Hello David,

I think my installation is working file. The version of Flair is 3.1-8 [35316717 ]
My OS ver is RHEL 8.2 / kernel: 4.18.0-193.1.2.el8_2.x86_64
This will be our production server.

drop down menu ==> Dicom page indicates errors

Error: No module named ‘dicom’

pydicom library cannot be loaded
either pydicom is missing or some dependency is missing

Install: all # python -m pip install pydicom

Extra requirments (name depends on distributions):

  • python3-numeric, python3-imaging or python3-pillow,
  • python3-imaging-tk or python3-pillow-tk or python3-pil.imagetk

Following are my pkg/rpm status with the current OS build:
rpm -qa | grep python3 | grep dicom

rpm -qa | grep python3 | grep -i pillow

Is this required for flair to work properly?


Dear Arthur,

the dicom package only required for processing medical DICOM files. Other flair features don’t require it.

It can be easily installed with

pip3 install -U pydicom

or, you maybe find it in your distributions repository.

In your case you installed a pydicom package from a Fedora 32 repository which is not compatible with your system. You will need to remove it first. (Similarly, the pillow packages from Fedora should be removed as well)


Hello David,
Thanks for your feedback.

I did the following:
pip3 install -U --force pydicom --user
Collecting pydicom
Using cached https://files.pythonhosted.org/packages/f4/15/df16546bc59bfca390cf072d473fb2c8acd4231636f64356593a63137e55/pydicom-2.1.2-py3-none-any.whl
Installing collected packages: pydicom
Successfully installed pydicom-2.1.2

My RPP for PyDicom was from EPEL/Fedora upstream … Redhat doesn’t have a pkg for pydicom:
RPM info:
rpm -qa | grep python3 | grep -i pydicom

But the errors persists on Dicom pop up page.

<<<< attached image

Please find the attached image.


Dear Arthur,

it is quite likely, that the Numpy, Scipy and Matplotlib packages are the culprits. Both can be installed with pip3 is they are missing.

You can check if the are installed correctly with

>>> import pydicom (or import dicom)
>>> import scipy
>>> import numpy
>>> import matplotlib