The following serves as a tutorial to those unfamiliar with the 3D Slicer who wish to visualize the 3D segmentation data (NRRD) associated with the data associated with the Prostate-Diagnosis collection collection in NRRD format. This tutorial assumes you have already downloaded the images and associated NRRD data from The Cancer Imaging Archive (TCIA). If you need assistance obtaining these, please go back to the Prostate-Diagnosis wiki page for more information on this topic.
Installing 3D Slicer
Browse to Browse http://download.slicer.org/ and install the appropriate pre-compiled binary for your system (Windows, Mac, Linux - 32 or 64bit). The stable release is preferred to the nightly build.
Digital Imaging and Communications in Medicine (DICOM) Data
Upon starting Slicer you will be presented with the "Welcome to Slicer" module and the Conventional conventional viewing layout. From here, click the "Load DICOM Data Button"button.
You will be presented with the DICOM Details window. Click the button next to "LocalDatabase" and select a folder for Slicer to use for keeping track of your DICOM data. Then Click click the "Import" button button.
Navigate to wherever the file where you saved the DICOM data from TCIA. Select the "Prostate-Diagnosis" directory directory and click "Import". You should now see the DICOM data in your "DICOM Details" screen screen. Drill down into the available data and select the T2W_TSE_AX from the patient you wish to analyze. Then To import, click the "Load Selection to Slicer" button button.
You should now see the The DICOM data will shot up in the 3 smaller viewing areas. You can adjust Adjust the window level by clicking and holding the left mouse button and moving your mouse. You can also zoom Zoom in or out in the same way with the right mouse button.
Loading the NRRD
Import the NRRD segmentation and generate a 3D model. First you must To do this, go to the "File" menu and choose "Add Data".
Next, click "Choose File(s) to Add" and and navigate to where you saved the NRRD data is saved. Locate the NRRD file associated with the patient whose DICOM data you loaded in the earlier steps and click "Open". You should now see the NRRD file listed as a volume. Next, click the "Show Options" box box in the top right corner of the dialog box and check the "LabelMap" option option that appears. Then click "OK".
You should now see the The colorized label maps appear as an overlay on the 2D DICOM images. Next, click the "Modules" menu menu and highlight "Surface Modules". Then, select "Model Maker".
The Model Maker module will now appear on the left side of the screen. Under "IO" change change the "Models" drop drop down box to "Create New ModelHierarchy". This will create a new entry called "Models" in in this box.
Click "Apply" at at the bottom of the module and should now see a 3D rendering of the NRRD label map in the main viewing window.
Combined DICOM and NRRD
You can now tweak some settings to further visualize the data. The following settings are emphasized shown in the screenshot below.:
- You can toggle Toggle between showing the label map with regions outlined or filled by clicking the small pushpin on each of the 2D views and selecting or deselecting the button next to the label map name.
- You can modify Modify the transparency of the label map by using the up/down arrows next to the label map name. The starting value is " 1.00" , which is fully opaque.
- You can also toggle Toggle whether the DICOM slices are visible in the 3D view by clicking the visibility button next to the slice orientation.
You can also customize Customize the 3D Model view by switching from the Model Maker module to the Models module. Clicking Click on each of the model components in the list presents options for to changing the visibility, colors, opacity, etc. You can also view View information about each segmentation component such as surface area and volume in this view as well.
From Steve Pieper on the Slicer-Devel mailing list:
To more accurately calculate volumes and related info use the Label Statistics module, then select your DICOM series for the Grayscale Volume, and the associated label map. Click Apply to calculate the information, and optionally click Save to export this data to a CSV file.