Feature class (Image original, Mask original, Image interpolated, Mask interpolated)

Hi

I have a question about feature class in diagnostic, such as Image original, Mask original, Image interpolated, and Mask interpolated.
What do they mean exactly?

As in the figure above, the values of spacing, size, max, and min in Image and Mask original seem to be reasonable. However, why are they almost the same between Image and Mask interpolated?
I thought spacing in Image-interpolated (1.0, 1.0, 1.0) is OK, but size (40,41,37) doesn’t make sense. Isn’t it supposed to be larger, like (170,170,60)??

My parameter settings are as follows:
imageType:

Original: {}

featureClass:
shape:
firstorder:
glcm:
glrlm:
glszm:
gldm:
ngtdm:

setting:
normalize: true
removeOutliers: 3
interpolator: ‘sitkLinear’
resampledPixelSpacing: [1, 1, 1]
binCount: 64
label: 1

Thank you,

TAKEDA