Practique allows users to create Resources with DICOM images . Practique supports grayscale as well as colour DICOM images can be added as Resources in risr/assess. Grayscale, colour and multi slice DICOM images are supported.
Different types Types of multi-slice DICOM formats supported by Practique:
single file, single slice DICOM (eg. chest-x-ray.dcm)
multiple file, multiple slice DICOM (eg. chest-x-ray-1.dcm, chest-x-ray-2.dcm, chest-x-ray-3.dcm)
single file, multiple slice DICOM (eg. chest-x-ray.dcm)
All these 3 multi-slice Each of these DICOM formats can be uploaded to Practique when creating risr/assess and will create a single Resource representing the DICOM image. When uploading DICOM images to Practique risr/assess users need to use a ZIP compression (create ZIP file) in order to be able to upload a DICOM image. Please see the next section for descriptions of the ZIP file structure for each of the file types above.
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You can find more information on what DICOM formats we support here
Image size: For optimum performance we recommend that DICOM images with a maximum of 100 slices be used. Images with more than 100 slices can cause significant slowing when downloading the exams onto local devices.
Total Exam Size: Practique supports a total exam size of 2GB. If you require larger exams than this please contact our service desk.
Preparing a DICOM ZIP file
Single file, single slice DICOM
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and Single file, multi slice DICOM
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These 2 cases are simplest case of the ZIP file which can be uploaded to Practiquethe simplest. In the screenshot on the right left, the ZIP file structure is the same as for single-file-single-slice. →
The user needs to produce a ZIP file which:
does not have any subfolders
DICOM image can have any name and/or extension
Multiple file, multiple slice DICOM
In this case Practique requires the user to , create a flat ZIP file containing only the files with individual slices of one DICOM image. In the screenshot on below, the right the ZIP file structure would be the same as for multiplemulti-file-multiplemulti-slice. →
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The user needs to produce ZIP file which:
does not have any subfolders
DICOM image can have any name and/or extension
Multiple slices are denoted by the increasing numeric filename (see multi-file-multi-slice case → )
Exporting DICOM images from OsiriX
In this case Practique risr/assess requires the user to create a hierarchical ZIP file containing only the files with individual slices of one DICOM image (See image below).Practique supports import of ZIP files exported from OsiriX, provided that users use export settings detailed in this section. Because there
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Let's consider the example database in OsiriX containing 3 patients with different DICOM imagery.
Select a patient and use the Export feature available in OsiriX.
For best results, use the export settings detailed below. There are many versions of OsiriX software which may have different export capabilities, the following information is only applicable to OsiriX 814.x.
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Let's consider following database in OsiriX containing 3 patients with different DICOM imaginary for each of the patient. We want to achieve easy export & import with such data. Example database →
In order to export each of the patients user selects patient and use Export feature of the OsiriX. User is presented with the screen similar to one on the next screenshot where it is possible to change settings of the export for that particular patient.
User needs to use the same settings as shown bellow in order to successfully export DICOM images into format which Practique can import.
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Once the user finishes settings and then exports information from OsiriX they will have ZIP files (in our case 3) present in the chosen destinationSelect the OsiriX Export settings:
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Once exported, a ZIP file will be generated. This ZIP file can be uploaded to items in risr/assess.
Filenames of the ZIP files will be the same as Patient name in OsiriX as shown in the bottom part of the screenshot belowthat is the export option chosen.
When ZIP Files are extracted (as we did with each of them in the screenshot) it is apparent what structure the OsiriX export achieved for various types of cases.
Notice that the structure of the ZIP files is the same for all cases. When "Patient" has multiple DICOM images (series) in OsiriX, the resulting ZIP file will contain the same number of folders as there is series, for example LC203.
Uploading DICOM images to
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risr/assess
Once user has prepared ZIP files either manually as per “Preparing DICOM ZIP file” or using OsiriX as per “Exporting DICOM images from OsiriX” ZIP files can be uploaded to Practique to create risr/assess as Resources.
Keep in mind that in Practique risr/assess one Resource corresponds to one DICOM image (can be multi-slice).
Users can use “+ Create new resource” when the ZIP file they’re uploading contains a single DICOM image (can be multiple slice).
When uploading a ZIP file (most likely export from OsiriX) which contains multiple DICOM images, (as for example LC203 mentioned above) user must use “+ Create multiple Resources” and Practique risr/assess will create a Resource for each DICOM image which is contained within the ZIP archive.
DICOM file order
DICOMs contain many slices and the order of the slices can vary according to how the file is prepared. In risr/assess, the default display is the order the files are added in the ZIP file.
To view the DICOM file order for the resource in risr/assess, find the resource in the Resource library and click View. Find and click the link ‘Show DICOM File details’ below the DICOM image. The order of the slices are displayed.
There is an option to edit the file order once the resource is uploaded and still in a DRAFT state.
To edit the file order, find the DICOM resource in Resource library. Click View and then Edit.
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DICOM File order options:
File - the order of the files as they are in the ZIP file
Alphanumeric - files are sorted alphanumerically
Spatial index - the order defined by the source application as part of the metadata for the slice