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CAT3D Resources

• Image processing
• Dosimetry for teletherapy
• Dosimetry for brachitherapy
• IMRT Module (optional)

CAT3D shows isodose curves overlapped with the patient's anatomy for both computer tomography (CT) and magnetic resonance (MRI).

The image processing module allows the generation of sagittal, coronal or arbitrary space-orientated reconstruction and the dosimetry module generates the dose distribution related to any of these reconstructed plans.

For the generation of conformal beams, CAT3D generates digitally reconstructed radiographies (DRR) in beam eye view – BEV.

CAT3D's DRR can be generated by simulating diagnosis X-rays (similar to the simulator's in energy) or high energy X-rays (2 MeV) to obtain images like the simulator films' in the LINAC itself.

The 3D representantions in perspective are also among the product's resources and allow to fuse in space: anatomy, isodose surfaces and regions of interest defined by the user (ROI).

The dose/volume histograms allow a detailed study of how a region defined as a ROI is being achieved.


• IMRT Module (Optional, not included in the standard full version).
• Add dose distributions from several plans.
• Automatic image matching (without POIs).
• DVH for Brachytherapy planning.
• New model for head scatter factor, improving monitor unit calculations for very elongated fields.
• Multimodality image matching using Mutual Information Maximization. The image fusion module incorporated the state of the art method for image matching.
• For the multi modality image fusion, "Import ROI" was introduced, to import ROIs that were previously drawn in the other modality.
• Better model for correcting the scatter contribution from a pencil in heterogeneous materials.
• Improved access control to planning files, for using a central patient database with several CAT3Ds or simulator in a network.
• Shadowed Isodoses.
• Animated GIF generation when the export option is used for 3D animation.
• Dose-volume histogram, cummulative and differential.
• Support for photons and electron beams.
• Generation of Digital Reconstructed Radiograph (DRR) with the field orientation (BEV).
• Conformal beams supporting MLC and cerrobend blocks.
• Inhomogeneity correction based on the Hounsfield density, voxel by voxel.
• Collimator angle customization.
• Protocol information exported to an external file. Useful for interfacing CAT3D with other device or program, such as clinic database.
• ROI interpolation. If the anatomic structure being delineated shows little changes in successive slices, the user can draw one slice and jump other. After closing the whole ROI, the interpolation creates new ROI segments for the slices previously ignored.
• Creation of a POI centered in the ROI for the three main axis (x,y,z). Can be useful to locate a possible isocenter for the ROI.

File Info
Manual_CAT3D_Port.pdf Size: 4.9M
Version History

Version 7.12.17
•   “Add ROIs” now can add up to 8 ROIs to create a new one. Previous version added only 2 ROIs.
•   “Add ROIs” remove unnecessary segments on overlapped regions that were retained in previous versions.
•   Optimized rendering for better performance with SDL 2.03 and 2.04. More evident in “Draw Brush ROI”.
•   Bug removed. In a ROI expansion if the number available segments was reached the system crashed. Now CAT3D emit the information and quit the expansion properly.
•   The maximum number of ROI segments increased from 2048 to 8192.
•   “ROI Info” now has a faster method for computing volumes of complex ROIs. At the end of “ROI Info” the number of used and free segments is presented.
•   In case of plans missing shield files (.PB), the protocol is not generated until the contradiction in the plan is solved either by finding the files or by removing the shields from the plan.
•   In case of plans with mixed energies the system became unresponsive during few seconds while creating the protocol. Now is more responsive and updates the window continuously.
•   NEW: Mouse wheel acting as Page-Up and Page-Down on planning and mosaic window.
•   Update user manual opened by CAT3D in the HELP option of main menu.
•   Better treatment of CAPS Lock.
•   New parameter to control Siemens wedge codes when exported to DicomRT-Plan. The last letter of the code could be “S”, “M” or “ “ (space). The three options are:
DCM_Siemens_Wedge_Style = "M"
DCM_Siemens_Wedge_Style = "S"
DCM_Siemens_Wedge_Style = " "