# I would like to ask a question about the dicom image center

**URL:** https://discourse.itk.org/t/i-would-like-to-ask-a-question-about-the-dicom-image-center/5955
**Category:** Beginner Questions
**Tags:** dicom
**Created:** [May 18, 2023, 5:52am UTC](https://discourse.itk.org/t/i-would-like-to-ask-a-question-about-the-dicom-image-center/5955 "2023-05-18T05:52:53Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![ma1282029525](https://discourse.itk.org/user_avatar/discourse.itk.org/ma1282029525/32/3084_2.png) [@ma1282029525](https://discourse.itk.org/u/ma1282029525)
#### Post date: [May 18, 2023, 5:52am UTC](https://discourse.itk.org/t/i-would-like-to-ask-a-question-about-the-dicom-image-center/5955/1 "2023-05-18T05:52:53Z")

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cbct origin[-140, -140, -140]  
cbct spacing[0.5, 0.5, 0.5]  
cbct size[560, 560, 560]  
cbct centerPoint[-280, -280, 0]  
cbct direction-1 0 0  
0 -1 0  
0 0 1

This is a CBCT image, and I don’t know if the information in this image is standard. Its center is not equal to the equicenter point of the device. Was the parameter setting incorrect during reconstruction？

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### Author: ![zivy](https://discourse.itk.org/user_avatar/discourse.itk.org/zivy/32/1726_2.png) [@zivy](https://discourse.itk.org/u/zivy)
#### Post date: [May 18, 2023, 12:47pm UTC](https://discourse.itk.org/t/i-would-like-to-ask-a-question-about-the-dicom-image-center/5955/2 "2023-05-18T12:47:42Z")

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Hello @ma1282029525,

The information is standard. The center of the image does not necessarily match the isocenter of the C-arm. For comparison see the two CBCT volumes in [this dataset](https://zenodo.org/record/4445444#.ZGYcDezML6g).