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Treatment plan verification tool

Step by Step Instructions (Strip Calibration)

Purpose: Complete IMRT analysis with calibration, dose mapping and plan comparison.
This example is based on calibration strips exposed to flat fields at several dose levels.
Protocol involves one image only!
Scanned image must include
  • Treatment field (treatment plan data are required).
  • Calibration strips exposed to flat field (flat field dose values at isocenter are required).
    Minimum requirement is one exposued strip and one unxposed strip.
Alternatively same treatment field example is available using

Data: Installation folder '.\Data\Example Prostate 250 cGy'.

1. Add Task
Add new task 'IMRT analysis (All in 1)' to the document.
Right click icon ('Landscape scan') and load bitmap 'Scan_Prostate 250 cGy Strips.tif'.

2. Calibration areas
Select frame tool and choose 'calibration strip' as frame type as shon below.

and draw frame for film strip to marke the calibration area. When the frame is selected a dialog panel to input the calibration dose value as shown below.
Note: The input of each dose value has to be fishshed by pressing the 'Enter' key.

Assign a frame for each calibration strip.
Tip: Ctrl-key+Click places a copy of the currently selected frame with center at mouse click position. When all four frames are assigned the OC Pro screen should look similar as shown below.
Each frame must carry the assigned calibration dose value - right click frame to change the calibration dose..

3. Calibration and Dose Map Generation
After the calibration frames are assigned, the calibration and dose map generation, one can recalibrate at any time using the button. The running process is indicated by red LED symbol underneath the center image.
To profile the calibration data assign a paths for each calibration frame as shown below.
Select the 'Dose Profile' tab of the chart mosaic to get the display as shown below indicating that the registration of the calibration plan is not perfect yet.

To delete the profile paths, click the profile tool icon and select 'Delete all paths'.

4. Comparison area and treatment plan assignment
Select frame tool and draw frame around the treatment field area. Change the frame type to 'Comparison area', right click inside the frame and select the typ as shown below.


After the frame type is changed, a 'Load file' panel will pop up automatically to load the treatment plan data - select the file 'Prostate 250 cGy Dose Plane.dcm' (use the filter 'DICOM - dcm (single image)').
The treatment plan can be changed any time by right clicking inside the comparison frame and using 'Assign treatment plan'.
Note: The treatment plan image needs to be rotated by 180° using the 'Bitmap Reader' as shown below.

Assign path pattern to comparison frame to profile dose vs plan data, use context menu as shown below.

Toggle from calibration mode to optimization (selected icon carries red mark). The mosaic chart changs as shown below including now numerical fields for registration and comparison data.
Depending on the assigned path pattern, the profiles dose vs treatment plan will look similar as shown below - since the plan registration is Not optimized yet, there is a noticable profiles offset visible and the passing rate is still low.

5. Optimization of treatment plan registration
To start the optimization of the treatment plan registration press the button - below OC Pro panel.

Stop the registration optimization when calibration data and treatment plan agree well enough by pressing the button. This completes the IMRT analysis process.

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