# Feature extractor

**URL:** <https://discourse.slicer.org/t/feature-extractor/29320>\
**Category:** Radiomics\
**Tags:** feature, python\
**Created:** [May 6, 2023, 6:37pm UTC](https://discourse.slicer.org/t/feature-extractor/29320 "2023-05-06T18:37:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Benji](https://avatars.discourse-cdn.com/v4/letter/b/f17d59/32.png) [@Benji](https://discourse.slicer.org/u/Benji)\
**Post date:** [May 6, 2023, 6:37pm UTC](https://discourse.slicer.org/t/feature-extractor/29320/1 "2023-05-06T18:37:35Z")

</div>

Dear community,

I have little experience in coding and I am using radiomics for the first time. I tried to find the solution in the documentation, websearch etc. but was not able to.

```auto
import radiomics
from radiomics import featureextractor
from radiomics import getFeatureClasses
import SimpleITK as sitk
import numpy as np 
from matplotlib import pyplot as plt

extractor = radiomics.featureextractor.RadiomicsFeatureExtractor()

#load numpy array with a CT image of a benign and malignant tumor and corresponding image masks
image_benign = np.load('case_00044_slice_33.npy')
mask_benign = np.load('case_00044_slice_33_segmentation.npy')
image_malig = np.load('case_00202_slice_137.npy')
mask_malig = np.load('case_00202_slice_137_segmentation.npy')

#transform arrays into sitk format
sitk_benign = sitk.GetImageFromArray(image_benign)
sitk_seg_benign = sitk.GetImageFromArray(mask_benign)
sitk_malig = sitk.GetImageFromArray(image_malig)
sitk_seg_malig = sitk.GetImageFromArray(mask_malig)

#extract tumor area
new_mask = (mask_benign == 2)*mask_benign
result = extractor.getSphericityFeatureValue(sitk_benign, new_mask)

```

AttributeError: ‘RadiomicsFeatureExtractor’ object has no attribute ‘getSphericityFeatureValue’  
is the error I receive…

I tried a couple other things, but that wasn’t working either. This might be a pretty basic question, nevertheless I’d be super happy for any help!

Cheers,  
Ben