The mobile app software company for medical image viewing, planning and fabrication.
Copyright © 2018 Conceptualiz Inc. All rights reserved.
FREQUENTLY ASKED QUESTIONS:


  • How do I create the most accurate 3-D model?
                        For optimal 3-D model accuracy, resolution and performance 
                        we recommend using standard soft tissue axial cuts at 0.5-1mm 
                        slice thickness. Thicker cuts >1mm will result in a less precise 
                        3-D model and thinner cuts <0.5mm will result in slower 
                        performance.

  • Can I use reformatted coronal and sagittal CT slices for 3-D modeling? 
                    Yes you can, however, reformatted coronal and sagittal 
                        reconstructions typically have larger slice thickness and will 
                        result in a less accurate 3-D model. For best results we recommend 
                        using axial cuts 0.5-1mm thickness and soft tissue windows. Axial 
                        cuts provide the most accurate scan data.

  • How do I improve a “stepped” looking model?
                        Larger slice thickness >1mm will result in a stepped looking model. 
                        We recommend a slice thickness of 0.5-1mm for optimal model 
                        resolution and accuracy.

  • The tissue I want to 3-D model does not display on the screen after segmentation?
                        The table seen above titled “Tissue Densities in Hounsfield Units” 
                        provides a guide when segmenting certain tissue thresholds using 
                        soft tissue windows. Obtaining the perfect tissue threshold may 
                        require a few segmentation trials to obtain the desired 3-D model. 
                        If bony windows are used instead of the recommended soft tissue 
                        windows then the typical Hounsfield unit thresholds may be less 
                        than expected.

  • I get an error message “Could not process files” during segmentation?
                        This means that the 3-D model size is exceeding the memory 
                        restrictions placed on iOS applications. To overcome this problem 
                        you can:

                            - Adjust the Hounsfield Unit threshold to a slightly higher 
                              level so that less tissue is rendered.

                            - If you do not want to sacrifice tissue resolution you can 
                              reduce your CT slice series volume size to focus in on 
                              certain anatomical structures. This will result in a 
                              thinner 3-D model but will provide the tissue accuracy  
                              and resolution that you desire.

  • After segmentation I get a lot of noise or artifact around the 3-D model?
                        There is a balance between accurately rendering desired tissue 
                        thresholds and reducing model noise/artifact. When modeling 
                        bone this is best optimised at +300 HU. You can reduce noise/
                        artifact by increasing the HU threshold level but this may affect 
                        3-D model accuracy. If high accuracy models are required then we 
                        recommend using your desired HU threshold and use the Selection 
                        tool from the tool bar to highlight and delete unwanted structures/
                        noise/artifact.

  • How do I import .DICOM, .stl or .obj files of anatomical models or import .stl files of implants?
                        This requires an in-app purchase to unlock this feature. Go to the 
                        Settings button in the tool bar and tap on Purchases > Buy Features.

                            - For importing .DICOM, .stl or .obj files of anatomical 
                               models see the section above titled “IMPORT DICOM 
                               SCANS FROM DROPBOX FOR SEGMENTATION OF 
                               3-D MODELS”.

                            - For importing .stl files of implants see the section above 
                               titled “6. INDUSTRY IMPLANT LIBRARY”.

  • How do import/export medical models or implants in .stl format to iTunes file sharing?
                        This requires an in-app purchase to unlock this feature. Go to the 
                        Settings in the tool bar and tap on Purchases > Buy Features.

                            - See the section above titled “3. SELECTION & 
                               MEDICAL MODELING TOOL - Exporting anatomical 
                               models to iTunes sharing.


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