# \#dicom

**URL:** https://discourse.itk.org/tag/dicom/13.md

[Latest](https://discourse.itk.org/latest.md) · [Categories](https://discourse.itk.org/categories.md) · [Tags](https://discourse.itk.org/tags.md)

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## [Writing large multiframe DICOM files via GDCM in ITK](https://discourse.itk.org/t/writing-large-multiframe-dicom-files-via-gdcm-in-itk/7426)

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**Author:** [@darrent1974](https://discourse.itk.org/u/darrent1974)\
**Replies:** 8\
**Last updated:** [September 4, 2026, 3:30am UTC](https://discourse.itk.org/t/writing-large-multiframe-dicom-files-via-gdcm-in-itk/7426 "2026-09-04T03:30:30Z")

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Hi, I was hoping to use GDCMImageIO to write large to very large image volumes (~10 -1000GB) as single file, mutiframe DICOM files. I specifically want to avoid writing these images as a set of individual 2D slice files…

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## [Should ITK offer a supported way to read DICOM tags and sequences? (four downstreams have vendored itk::DCMTKFileReader)](https://discourse.itk.org/t/should-itk-offer-a-supported-way-to-read-dicom-tags-and-sequences-four-downstreams-have-vendored-itk-dcmtkfilereader/7791)

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**Author:** [@hjmjohnson](https://discourse.itk.org/u/hjmjohnson)\
**Replies:** 3\
**Last updated:** [August 18, 2026, 7:47pm UTC](https://discourse.itk.org/t/should-itk-offer-a-supported-way-to-read-dicom-tags-and-sequences-four-downstreams-have-vendored-itk-dcmtkfilereader/7791 "2026-08-18T19:47:38Z")

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While fixing a Windows link failure in BRAINSTools, I found the same vendored copy of itk::DCMTKFileReader in four independent projects, all of them in namespace itk with ITK’s original class names. Three are actively m…

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## [Some Dicom format issues](https://discourse.itk.org/t/some-dicom-format-issues/7664)

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**Author:** [@Xoz](https://discourse.itk.org/u/Xoz)\
**Replies:** 3\
**Last updated:** [November 15, 2025, 8:34pm UTC](https://discourse.itk.org/t/some-dicom-format-issues/7664 "2025-11-15T20:34:06Z")

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Hi everyone, I’ve been working with new @itk-wasm/image-io and @itk-wasm/dicom for a while and met some issues with the file format, some of them may be not in plan to be supported, so I would like to know your opinion …

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## [Overlaying Structures on CT Images in Axial, Coronal, and Sagittal Views](https://discourse.itk.org/t/overlaying-structures-on-ct-images-in-axial-coronal-and-sagittal-views/7647)

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**Author:** [@blue\_sky](https://discourse.itk.org/u/blue_sky)\
**Replies:** 3\
**Last updated:** [October 21, 2025, 1:40pm UTC](https://discourse.itk.org/t/overlaying-structures-on-ct-images-in-axial-coronal-and-sagittal-views/7647 "2025-10-21T13:40:45Z")

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Hello everyone, I am working on displaying CT images in the axial, coronal, and sagittal planes, along with dose maps and RTSTRUCT contours. While the CT and dose images are displayed correctly, I am having trouble over…

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## [volume regularization using ITK](https://discourse.itk.org/t/volume-regularization-using-itk/7594)

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**Author:** [@Eva\_Monclus\_Lahoya](https://discourse.itk.org/u/Eva_Monclus_Lahoya)\
**Replies:** 4\
**Last updated:** [September 19, 2025, 8:29pm UTC](https://discourse.itk.org/t/volume-regularization-using-itk/7594 "2025-09-19T20:29:29Z")

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Hello, I’m working on a Python application that uses ITK, and I’m looking for guidance on how to regularize or resample a 3D volume when the slice spacing is not uniform—i.e., the distance between slices varies througho…

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## [Dice Coefficient Calculation in Python](https://discourse.itk.org/t/dice-coefficient-calculation-in-python/7628)

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**Author:** [@blue\_sky](https://discourse.itk.org/u/blue_sky)\
**Replies:** 2\
**Last updated:** [September 11, 2025, 9:01am UTC](https://discourse.itk.org/t/dice-coefficient-calculation-in-python/7628 "2025-09-11T09:01:10Z")

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Hello everyone, I’m trying to compute the Dice coefficient using a Python script. To implement this, I have used ideas and code from the following links: “SimpleITK-Notebooks/Python/34\_Segmentation\_Evaluation.ipynb at…

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## [Registration of CT Images with Large Organ Deformations](https://discourse.itk.org/t/registration-of-ct-images-with-large-organ-deformations/7627)

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**Author:** [@blue\_sky](https://discourse.itk.org/u/blue_sky)\
**Replies:** 1\
**Last updated:** [September 2, 2025, 7:49pm UTC](https://discourse.itk.org/t/registration-of-ct-images-with-large-organ-deformations/7627 "2025-09-02T19:49:17Z")

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Hello everyone, I have two CT images that I want to register together. One is from external beam radiotherapy (EBRT), and the other is from brachytherapy. Before registration, I harmonized both images by making their Or…

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## [Multiple series in a single CT series](https://discourse.itk.org/t/multiple-series-in-a-single-ct-series/1525)

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**Author:** [@hadasara](https://discourse.itk.org/u/hadasara)\
**Replies:** 18\
**Last updated:** [July 28, 2025, 6:57pm UTC](https://discourse.itk.org/t/multiple-series-in-a-single-ct-series/1525 "2025-07-28T18:57:53Z")

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Hi all, Maybe someone here would know- I came across a CT series, that include 2 series, saved as a single one. When you scroll in axial slices, you see shoulder s to pelvis and then agin shoulders to pelvis in a late…

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## [reading and writng a dicom image](https://discourse.itk.org/t/reading-and-writng-a-dicom-image/3992)

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**Author:** [@sarbabi](https://discourse.itk.org/u/sarbabi)\
**Replies:** 7\
**Last updated:** [June 26, 2025, 9:59pm UTC](https://discourse.itk.org/t/reading-and-writng-a-dicom-image/3992 "2025-06-26T21:59:06Z")

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Hi, In the following simple piece of code I’m trying to read a DICOM image as sitkImage and its tags as a python dictionary. then I call another function to write that image in another location with the same tags readin…

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## [Edge cases of DICOMOrient](https://discourse.itk.org/t/edge-cases-of-dicomorient/7559)

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**Author:** [@ahulist](https://discourse.itk.org/u/ahulist)\
**Replies:** 2\
**Last updated:** [June 5, 2025, 11:22pm UTC](https://discourse.itk.org/t/edge-cases-of-dicomorient/7559 "2025-06-05T23:22:39Z")

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I’m using SimpleITK’s DICOMOrient to reorient a stack of DICOM slices. When I read files as a simple list (instead of using ImageSeriesReader), SITK only uses the first slice’s Origin/Spacing and infers the rest on the f…

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## [Is the rescale slope the same for all dicom in one sery?](https://discourse.itk.org/t/is-the-rescale-slope-the-same-for-all-dicom-in-one-sery/7546)

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**Author:** [@zhang-qiang-github](https://discourse.itk.org/u/zhang-qiang-github)\
**Replies:** 1\
**Last updated:** [May 28, 2025, 2:08pm UTC](https://discourse.itk.org/t/is-the-rescale-slope-the-same-for-all-dicom-in-one-sery/7546 "2025-05-28T14:08:47Z")

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Let’s say, one sery has 100 dicom files. Is the rescale slope (0028, 1053) must the same for all 100 dicom file? Or it may be different for dicom files in one sery? Any suggestion is appreciated~~~

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## [ITK-snap cannot load DICOM](https://discourse.itk.org/t/itk-snap-cannot-load-dicom/4351)

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**Author:** [@Won\_Chul\_Chung](https://discourse.itk.org/u/Won_Chul_Chung)\
**Replies:** 9\
**Last updated:** [May 21, 2025, 6:25pm UTC](https://discourse.itk.org/t/itk-snap-cannot-load-dicom/4351 "2025-05-21T18:25:02Z")

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Hello, I am relatively new to python and itk. I originally started with MicroCT scan images with .tif extension. (single series, about 500 “slices”) I then transformed the slices into DICOM series using simpleitk func…

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## [DICOMOrient Voxel Data Permutations/Flips in SimpleITK](https://discourse.itk.org/t/dicomorient-voxel-data-permutations-flips-in-simpleitk/7516)

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**Author:** [@ahulist](https://discourse.itk.org/u/ahulist)\
**Replies:** 2\
**Last updated:** [May 12, 2025, 4:03am UTC](https://discourse.itk.org/t/dicomorient-voxel-data-permutations-flips-in-simpleitk/7516 "2025-05-12T04:03:52Z")

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Hi all, I’m working with a DICOM processing pipeline where I use sitk.DICOMOrient(image, "LPS") to reorient an original series. Later, I need to revert this lps\_oriented\_image back to match the exact voxel data order an…

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## [TensorFractionalAnisotropyImageFilter calculate FA bigger than 1](https://discourse.itk.org/t/tensorfractionalanisotropyimagefilter-calculate-fa-bigger-than-1/7432)

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**Author:** [@Pinyu\_Huang](https://discourse.itk.org/u/Pinyu_Huang)\
**Replies:** 4\
**Last updated:** [February 18, 2025, 1:42am UTC](https://discourse.itk.org/t/tensorfractionalanisotropyimagefilter-calculate-fa-bigger-than-1/7432 "2025-02-18T01:42:21Z")

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I use TensorFractionalAnisotropyImageFilter to calculate FA for the DTI image. The code is: using Image3DType = itk::Image\<float, 3\> using FAFilterType = itk::TensorFractionalAnisotropyImageFilter\<TensorReconstructionFi…

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## [Same patient's dicom volumes has different dimensions, spacing and slices numbers](https://discourse.itk.org/t/same-patients-dicom-volumes-has-different-dimensions-spacing-and-slices-numbers/7256)

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**Author:** [@Deniz\_Ceylan](https://discourse.itk.org/u/Deniz_Ceylan)\
**Replies:** 1\
**Last updated:** [October 14, 2024, 12:52pm UTC](https://discourse.itk.org/t/same-patients-dicom-volumes-has-different-dimensions-spacing-and-slices-numbers/7256 "2024-10-14T12:52:03Z")

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Hi, I’ve looked for solutions here but i couldnt find. Sorry if it’s a duplication. I have 11 different DICOM volumes of same patient (converted to nifti) with absolutely different dimensions. I want to use caPTk for…

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## [creation of dicom with less size](https://discourse.itk.org/t/creation-of-dicom-with-less-size/6372)

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**Author:** [@George\_Z](https://discourse.itk.org/u/George_Z)\
**Replies:** 6\
**Last updated:** [August 1, 2024, 4:46pm UTC](https://discourse.itk.org/t/creation-of-dicom-with-less-size/6372 "2024-08-01T16:46:24Z")

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Hello, I am trying to reduce dicom file size when creating a new dicom by converting from bmp to png but I do not see the file size getting reduced, png use compession so logically I have less file size. Best Regards …

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## [Trouble when reading some dcm files](https://discourse.itk.org/t/trouble-when-reading-some-dcm-files/7190)

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**Author:** [@Xoz](https://discourse.itk.org/u/Xoz)\
**Replies:** 4\
**Last updated:** [August 26, 2024, 7:29am UTC](https://discourse.itk.org/t/trouble-when-reading-some-dcm-files/7190 "2024-08-26T07:29:21Z")

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Hi everyone, I met a problem when reading some dcm files recently when using itk-wasm, in the past the input files was usually a sort of single slice dcm files, but some newer ones became only one file that seems contai…

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## [3D Reconstruction from 2D XRay DICOM images](https://discourse.itk.org/t/3d-reconstruction-from-2d-xray-dicom-images/7161)

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**Author:** [@drathin4](https://discourse.itk.org/u/drathin4)\
**Replies:** 2\
**Last updated:** [August 8, 2024, 2:13pm UTC](https://discourse.itk.org/t/3d-reconstruction-from-2d-xray-dicom-images/7161 "2024-08-08T14:13:35Z")

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Can we reconstruct 3D model from 2D DiCoM images obtained from XRays? I read this link, but didn’t find any relevant answer: 3D reconstruction I also didn’t find any geometric metadata in the XRay DiCoM files unlike t…

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## [Variably Spaced DICOM Data Support](https://discourse.itk.org/t/variably-spaced-dicom-data-support/6699)

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**Author:** [@Michael\_M](https://discourse.itk.org/u/Michael_M)\
**Replies:** 3\
**Last updated:** [July 19, 2024, 7:30pm UTC](https://discourse.itk.org/t/variably-spaced-dicom-data-support/6699 "2024-07-19T19:30:19Z")

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A not uncommon practice in the medical world involves scanning a patient with different slice thicknesses in different parts of the anatomy, all within the same DICOM series. For example, the patient is imaged with CT o…

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## [cxx355: Requested region is (at least partially) outside the largest possible region.](https://discourse.itk.org/t/cxx355-requested-region-is-at-least-partially-outside-the-largest-possible-region/6729)

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**Author:** [@wta](https://discourse.itk.org/u/wta)\
**Replies:** 2\
**Last updated:** [June 28, 2024, 1:57pm UTC](https://discourse.itk.org/t/cxx355-requested-region-is-at-least-partially-outside-the-largest-possible-region/6729 "2024-06-28T13:57:34Z")

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I am very sorry for taking up everyone’s time! I’m using the ITK-SNAP 4.2 executable, but I can’t open the DOM image, but I can’t understand at all why that’s the case, because all my previous images opened,and finished…

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## [Non axis aligned orientation in real world data?](https://discourse.itk.org/t/non-axis-aligned-orientation-in-real-world-data/6639)

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**Author:** [@Jakub\_Mitura](https://discourse.itk.org/u/Jakub_Mitura)\
**Replies:** 6\
**Last updated:** [May 21, 2024, 7:26pm UTC](https://discourse.itk.org/t/non-axis-aligned-orientation-in-real-world-data/6639 "2024-05-21T19:26:01Z")

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Hello from your experience is it happening that direction cosine matrix is not axis aligned for studies like CT PET MRI . I mean when orientation is not RAS or LPS … can not be summarized in 3 letter code because it is o…

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## [Read different series of dicom](https://discourse.itk.org/t/read-different-series-of-dicom/6251)

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**Author:** [@Xoz](https://discourse.itk.org/u/Xoz)\
**Replies:** 8\
**Last updated:** [May 20, 2024, 4:13am UTC](https://discourse.itk.org/t/read-different-series-of-dicom/6251 "2024-05-20T04:13:43Z")

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Hi everyone, I’ve got an issue when loading some dicom files using itk-wasm, in the past I load the uploaded files through readImageDICOMFileSeries, it worked fine when there is just a single serie. But some of the dic…

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## [How to filter dicom images using a kernel?](https://discourse.itk.org/t/how-to-filter-dicom-images-using-a-kernel/6610)

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**Author:** [@dbtruong](https://discourse.itk.org/u/dbtruong)\
**Replies:** 1\
**Last updated:** [May 19, 2024, 9:11pm UTC](https://discourse.itk.org/t/how-to-filter-dicom-images-using-a-kernel/6610 "2024-05-19T21:11:33Z")

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Hello everyone, I use itk.js for some web image processing functionality. How to filter dicom images using itk.js? Thanks.

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## [DICOM cerebral arteries image](https://discourse.itk.org/t/dicom-cerebral-arteries-image/6635)

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**Author:** [@rfrank](https://discourse.itk.org/u/rfrank)\
**Replies:** 0\
**Last updated:** [May 17, 2024, 8:30pm UTC](https://discourse.itk.org/t/dicom-cerebral-arteries-image/6635 "2024-05-17T20:30:04Z")

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Hi, Looking for anonymized DICOM CT images of cerebral arteries… nrrd or mha also ok. If anyone knows a source, please let me know. Thanks

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## [transfer syntax conversion](https://discourse.itk.org/t/transfer-syntax-conversion/6593)

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**Author:** [@George\_Z](https://discourse.itk.org/u/George_Z)\
**Replies:** 0\
**Last updated:** [April 24, 2024, 5:22pm UTC](https://discourse.itk.org/t/transfer-syntax-conversion/6593 "2024-04-24T17:22:30Z")

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Hello, I was wondering if ITK support conversion of jpeg2000 to Little Endian? I humbly wish to consider The below transfer syntaxes: JPEG Baseline (1.2.840.10008.1.2.4.50) JPEG Extended (1.2.840.10008.1.2.4.51) JPE…

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## [ITK 5.4 Release Candidate 4: ALL THE DICOMs](https://discourse.itk.org/t/itk-5-4-release-candidate-4-all-the-dicoms/6592)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 0\
**Last updated:** [April 24, 2024, 4:50pm UTC](https://discourse.itk.org/t/itk-5-4-release-candidate-4-all-the-dicoms/6592 "2024-04-24T16:50:20Z")

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We are happy to announce the Insight Toolkit (ITK) 5.4 Release Candidate 4 is available for testing! :tada: ITK is an open-source, cross-platform toolkit for N-dimensional scientific image processing, segmentation, and r…

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## [How to preprocess diffusion MRI?](https://discourse.itk.org/t/how-to-preprocess-diffusion-mri/6581)

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**Author:** [@Sunita\_Patel](https://discourse.itk.org/u/Sunita_Patel)\
**Replies:** 2\
**Last updated:** [April 18, 2024, 10:19am UTC](https://discourse.itk.org/t/how-to-preprocess-diffusion-mri/6581 "2024-04-18T10:19:19Z")

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Dear SITK-users How to preprocess diffusion MRI DICOM images? So far we have been using publicly available processed DWI nifti file and the given .bvec and .bval files. Now, we would like to do preprocessing from DICOM …

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## [ITK Affine transform doesn't translate the image as expected](https://discourse.itk.org/t/itk-affine-transform-doesnt-translate-the-image-as-expected/6584)

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**Author:** [@Erezke](https://discourse.itk.org/u/Erezke)\
**Replies:** 0\
**Last updated:** [April 18, 2024, 5:45am UTC](https://discourse.itk.org/t/itk-affine-transform-doesnt-translate-the-image-as-expected/6584 "2024-04-18T05:45:40Z")

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Hi I am trying to translate a DICOM image using an affine transform to a new position, but when I compare the centers of both images (before/after) it seems like the image did not move. Following is the code I use: ...…

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## [Error loading DICOM file](https://discourse.itk.org/t/error-loading-dicom-file/6489)

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**Author:** [@Kewil\_Bhima](https://discourse.itk.org/u/Kewil_Bhima)\
**Replies:** 3\
**Last updated:** [March 4, 2024, 8:15pm UTC](https://discourse.itk.org/t/error-loading-dicom-file/6489 "2024-03-04T20:15:38Z")

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I have recently downloaded ITK-Snap and I am having issues loading an image. I get an error saying “vector too long” when trying to load a DICOM file from a MRI scan. I have no issue opening this same image in other soft…

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## [DICOMOrientImageFilter in C#](https://discourse.itk.org/t/dicomorientimagefilter-in-c/6400)

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**Author:** [@Toru\_Hironaka](https://discourse.itk.org/u/Toru_Hironaka)\
**Replies:** 2\
**Last updated:** [January 18, 2024, 12:01am UTC](https://discourse.itk.org/t/dicomorientimagefilter-in-c/6400 "2024-01-18T00:01:35Z")

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I installed SimpleITK-1.2.4-CSharp-win64-x64, but I could not find DICOMOrientImageFilter. Is this class only available in C++? or Do I have to build SimpleITK source to install?

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