intensityFeatures
Description
Examples
Compute Intensity Features for Computed Tomography (CT) Image
Import a computed tomography (CT) image volume and the corresponding ROI mask volume from the IBSI validation data set [1][2][3] as medicalVolume
objects.
unzip("CTImageMaskNIfTI.zip") data = medicalVolume("CT_image.nii.gz"); roi = medicalVolume("CT_mask.nii.gz");
Visualize a slice of the CT image volume and the corresponding ROI.
figure
imshowpair(data.Voxels(:,:,20),roi.Voxels(:,:,20),"montage")
Create a radiomics
object, using the CT image volume and ROI mask volume, with default preprocessing options.
R = radiomics(data,roi)
R = radiomics with properties: Data: [1x1 medicalVolume] ROILabel: [1x1 medicalVolume] Resample: 1 Resegment: 1 Discretize: 1 DiscretizeIVH: 1 ResampledVoxelSpacing: 1 DataResampleMethod: 'linear' MaskResampleMethod: 'linear' ResegmentationRange: [] ExcludeOutliers: 1 DiscreteBinSizeOrBinNumber: [] DiscreteMethod: 'FixedBinNumber' DiscreteIVHBinSizeOrBinNumber: [] DiscreteIVHMethod: 'FixedBinNumber'
Compute the local intensity features of the ROI in the 2D-resampled CT image volume.
I = intensityFeatures(R,Type="LocalIntensity",SubType="2D")
I=1×3 table
LabelID LocalIntensityPeak2D GlobalIntensityPeak2D
_______ ____________________ _____________________
"1" 71.689 78.084
[1] Vallières, Martin, Carolyn R. Freeman, Sonia R. Skamene, and Issam El Naqa. “A Radiomics Model from Joint FDG-PET and MRI Texture Features for the Prediction of Lung Metastases in Soft-Tissue Sarcomas of the Extremities.” The Cancer Imaging Archive, 2015. https://doi.org/10.7937/K9/TCIA.2015.7GO2GSKS.
[2] Vallières, M, C R Freeman, S R Skamene, and I El Naqa. “A Radiomics Model from Joint FDG-PET and MRI Texture Features for the Prediction of Lung Metastases in Soft-Tissue Sarcomas of the Extremities.” Physics in Medicine and Biology 60, no. 14 (July 7, 2015): 5471–96. https://doi.org/10.1088/0031-9155/60/14/5471.
[3] Clark, Kenneth, Bruce Vendt, Kirk Smith, John Freymann, Justin Kirby, Paul Koppel, Stephen Moore, et al. “The Cancer Imaging Archive (TCIA): Maintaining and Operating a Public Information Repository.” Journal of Digital Imaging 26, no. 6 (December 2013): 1045–57. https://doi.org/10.1007/s10278-013-9622-7.
Input Arguments
Name-Value Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Name-value arguments must appear after other arguments, but the order of the
pairs does not matter.
Example: intensityFeatures(R,Type="LocalIntensity",SubType="2D")
computes the local intensity features on 2D resampled data.
Type
— Category of intensity features
"all"
(default) | "LocalIntensity"
| "IntensityBasedStatistics"
| "IntensityHistogram"
| "IntensityVolumeHistogram"
Category of intensity features to compute, specified as one of these options.
"LocalIntensity"
"IntensityBasedStatistics"
"IntensityHistogram"
"IntensityVolumeHistogram"
"all"
If you specify "all"
, the function computes every
category of intensity features. For more information on which specific intensity
features each category includes, see IBSI Standard and Radiomics Function Feature Correspondences.
Data Types: char
| string
SubType
— Resampling from which to compute intensity features
"3D"
(default) | "2D"
| "all"
Resampling from which to compute intensity features, specified as one of these options.
"2D"
— Computes features from the 2D resampled volume."3D"
— Computes features from the 3D resampled volume."all"
— Computes features for both options.
When you 2D-resample the volume, the function makes the voxel spacing along the x- and y-dimensions isotropic, but the voxel spacing along the z-dimension is the same as in the input volume. When you 3D-resample the volume, the function makes the voxel spacing along all three spatial dimensions isotropic.
Data Types: char
| string
Output Arguments
I
— Intensity features
table
Intensity features, returned as a table. The first column in I
is
LabelID
. The subsequent columns are the intensity features. For
more details on which intensity features are computed in each Type
and SubType
, see IBSI Standard and Radiomics Function Feature Correspondences.
Version History
Introduced in R2023b
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