MPR and related tools
PACSonWEB contains the following advanced image tools for multislice series:
• Multi Planar Reconstruction
• Maximum Intensity Projection
• Minimal Intensity Projection
• Multi Projection Volume Reconstruction
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Important! MPR as supplement
All diagnosis and medical decisions based on MPR generated images (MPR, MIP, MinIP, MPVR) should always be double checked with the original series.
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Important! MPR accuracy and resolution
The accuracy of MPR generated images depends on the quality of the original series (pixel spacing, slice thickness ...).
The images are calculated, based on the data available in the original series.
Gaps of pixel- data will be calculated to show a smooth image.
It will remain the user's responsibility to keep in mind the slice thickness and pixel spacing from the original series.
In case the slice thickness is larger than the pixel spacing, overlap between slices is not taken into account.
The used pixel spacing is calculated based on the image location of the original images
The user should be aware of lossy data visualization while judging and diagnosing a patient.
The user should also be aware that series that lost pixel- data while compressing or have an inappropriate slice thickness are not suitable for proper MPR generation.
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Important! MIP, MinIP and MPVR calculations
While using MIP, MinIP and MPVR calculations, only one pixel is shown for the whole thickness of the slice. The user should know that only selective data is shown based on these calculations, and that it is his responsibility to double check the data with the original series.
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Warning: These functionalities are not supported on mobile devices.
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The tools can only be activated for images of the following modality type:
• CT
• MR
• NM
• PT / PET
• ST / SPECT
If a viewport with such a series is selected, the button "MPR" is available from the toolbar. When clicking the button, the complete list of MPR functionalities is displayed.
The "MPR" menu is also available from a right mouse click on the image.
For ease of use, you can use the following short cuts:
Activate / Deactivate MPR | CTRL + M |
Show / Hide reference lines | CTRL + X |
In case MPR is active:Reset MPR to original orientations, reset zoom factor and window level | SPACEBAR |
Move viewport to left | Left arrow key  |
In case an image series is selected that does not support MPR, the button is grayed out in the toolbar and the option "MPR" is not listed in the context menu when performing a right mouse click on the image.
In case the MPR can not be created due to insufficient memory, the following notification will be displayed.
| Warning: In order to be able to generate usable MPR data the related image series must comply with each of the following conditions: • distance between each set of consecutive slices is equal • series consists of 10 slices or more • series consists of 10000 slices or less • spacing between slices is max. 10 mm • all images within the series have the exact same orientation • source frames are monochrome If a condition is not fulfilled an appropriate warning message will be displayed. |