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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 7.12.12
• Better treatment of oblique ROIs in DVH and a bug removed regarding oblique ROIs (usually ROIs imported from a registered external image set –fusion–).
• New field : "Approved by" in Save Plan dialog. When you save a plan the field "Approved by" can be filled. If "Approved by" is filled the plan became protected against changes. If you need to make changes to the plan, clean the "Approved by" field before. You should only fill the Approved field when the plan is accepted and there is little probability of new modifications.
• If you prefer the wedge orientation as LEFT instead of CW and RIGHT instead of CCW, add the following line to the RSD file :
WedgePosStyle = 1
• New parameters for DicomRT Plan export, that should be configured inside the RSD if you need to export Dicom plans to your treatment machine or "Record & Verify" system.
New. Every time you save the plan a Dicom-RT-Plan file is saved into the working path folder. The file name is: PlanName.DCM . The Dicom-RT-Plan can be used in Record&Verify systems, Linac control consoles (those supporting dicom plan) or external verification systems.
New. Every time you create a DRR-BEV, a Dicom image of the corresponding DRR is saved into de working path folder. The name of the dicom-DRR file is : PlanName.nnDRR.DCM, where nn is the number of the associated field. A Dicom version of the DRR is useful if you have a system or external tool for checking patient position with a portal image.
New. Optional module for stereotactic radiotherapy. Use CTRL-0 to define the origin of your Cartesian coordinate system based on a stereotactic frame. So far there is support only for BrainLab frame.
• Dose Grid redefinition by user. The user can limit the vertical extent (Z axis) of the dose grid by means of two POIs with reserved keywords: DGRIDL and DGRIDH. Voxels outside dose grid region are assigned zero (0.0) dose value. Use this option if you have a CT volume bigger than your PTV and OAR in the vertical direction.
• Export all the images in plan as Dicom files.
• New version of WDcalc 3.06. Included some tools for electron beams dosimetry, such as: Beam Quality Specification from I50, Mean energy at surface, mean energy at depth and Stopping Powers water/air as function of R50 and depth [mm].
• Dicom import changed to version 5.23. New support to a subset of NIfTI-1 image files (32 bits only). Better treatment of images with overlays, our Dicom importer skips the overlay information, gracefully.