# How to increase the image quality when I convert Dicom file to nii file

**URL:** <https://discourse.slicer.org/t/how-to-increase-the-image-quality-when-i-convert-dicom-file-to-nii-file/12928>\
**Category:** Support\
**Tags:** dicom\
**Created:** [August 10, 2020, 3:12pm UTC](https://discourse.slicer.org/t/how-to-increase-the-image-quality-when-i-convert-dicom-file-to-nii-file/12928 "2020-08-10T15:12:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![samsonaie](https://avatars.discourse-cdn.com/v4/letter/s/d07c76/32.png) [@samsonaie](https://discourse.slicer.org/u/samsonaie)\
**Post date:** [August 10, 2020, 3:12pm UTC](https://discourse.slicer.org/t/how-to-increase-the-image-quality-when-i-convert-dicom-file-to-nii-file/12928/1 "2020-08-10T15:12:33Z")

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Hi There,  
I had successfully converted a 3D ultrasound dicom file into a nii file. I am doing this because I can use a python script to convert nii file to a series of image (png) file with X/Y/Z dimension info. However, I found the quality of nii is very low ,thus the png files are also very low resolution.

I would like to ask a favor from the expert in the forum:

1. is there a special parameter / or setting I need to configure in 3D slicer when I convert dicom to nii ?
2. is there a way , I can convert dicom file , DIRECTLY, to a series of png files.

Any suggestion or tips will be definitely helpful !! thanks ,

Samson

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [August 10, 2020, 4:12pm UTC](https://discourse.slicer.org/t/how-to-increase-the-image-quality-when-i-convert-dicom-file-to-nii-file/12928/2 "2020-08-10T16:12:47Z")

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There is no image quality loss when you save an image in Nifti format. It is a very simple operation and not much can go wrong.

It is much more likely that there is a problem during DICOM import. 3D ultrasound data is usually stored in proprietary DICOM tags, so importing it is not trivial. How did you open the 3D ultrasound DICOM file? Using [SlicerHeart extension](https://github.com/SlicerHeart/SlicerHeart#importing-dicom-files)? Is it fetal or cardiovascular ultrasound? Which vendor, which ultrasound system?

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**Author:** ![samsonaie](https://avatars.discourse-cdn.com/v4/letter/s/d07c76/32.png) [@samsonaie](https://discourse.slicer.org/u/samsonaie)\
**Post date:** [August 11, 2020, 1:58am UTC](https://discourse.slicer.org/t/how-to-increase-the-image-quality-when-i-convert-dicom-file-to-nii-file/12928/3 "2020-08-11T01:58:27Z")

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> [@lassoan](#):
>
> [SlicerHeart extension](https://github.com/SlicerHeart/SlicerHeart#importing-dicom-files)

The dicom is acquired from GE E8.  
I had installed [SlicerHeart extension](https://github.com/SlicerHeart/SlicerHeart#importing-dicom-files), and also successfully load the ultrasound file in 3D slicer and view it in volume rendering mode.

any other tips , please advice, thanks

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [August 11, 2020, 3:14am UTC](https://discourse.slicer.org/t/how-to-increase-the-image-quality-when-i-convert-dicom-file-to-nii-file/12928/4 "2020-08-11T03:14:25Z")

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Is the image quality you see in Slicer good? If you save as .nii and load the .nii is the image quality the same? Can you attach a screenshot that shows the bad image quality?