Bitmap 2D/3D Comparison Tool

1. Add 'Image comparison' task to the document - right click task list as shown below and select 'Load bitmap'.

2. Load client (dose map) image - right click client icon as shown below. File name: 'Example Comparison Client (dose map).tif'.

3. Load reference (plan) image - right click reference icon and select 'Load Bitmap'. File name: 'Example Comparison Reference (plan).tif'.

4. Select 'Image comparison' tool - use tool selector underneath task list Or right click task list as shown below.

The OC screen should look now as shown below - Cyan colored areas present the reference image data (dose map) and the Red colored areas the client image (plan).

5. Initial registration of the images - right click the chart area and select 'Match reference and client value centers' .

There are alternative ways for the initial fit:
- Match isocenters (if available)
- Manually adjust the client image positioning by click and drag this image.

6. Zero the offset (optional) - push button as shown below.

The offset value is zeroed by projecting the offset reference points at reference image (dose map) to the client image (plan) using registration data.

7. Select the optimization tool icon Start the comparison optimization by clicking the 'Go' button (marked in the figure below).

Optimization process stops when optimization criterias are met - click button to display the panel (shown below) to modify optimization parameters.

See parameter settings for more details .

8. Select any of the available tool to evaluate the comparison - e.g. select isomap tool at vertical tool bar.

1. Add 'Image comparison' task to the document - right click task list as shown below.

2. Load client (dose map) image - right click client icon as shown below. File name: 'Example Comparison Client (dose map).tif'.

3. Load reference (plan) 2D bitcube data - right click reference icon as shown below and select 'Load Bitcube'. File name: 'Example Comparison SBRT.dcm'.

This will start the Dicom reader dialog below.

This demo example uses the plan extracted at Y-Z plane (sagittal plane). to complete this example, select the resolution as 18 dpi. Follow the link for details of the Dicom reader .
Note: Images with attached 3D bitcube data are marked with as pictured below.

4. Select 'Image comparison' tool - use tool selector underneath task list Or right click task list as shown below.

The OC screen should look now as shown below - Cyan colored areas present the reference image data (dose map) and the Red colored areas the client image (plan).

Note the 3D chart showing the positioning of the plan surface (plane) inside the data cuboid.

6. Initial registration of the images - right click the chart area and select 'Match reference and client value centers' .

There are alternative ways for the initial fit:
- Match isocenters (if available)
- Manually adjust the client image positioning by click and drag this image.

6. Zero the offset (optional) - push button. Screen should look now as shown below.

The offset value is zeroed by projecting the offset reference points at reference image (dose map) to the client image (plan) using registration data. The positioning of the plan surface (plane) in the bitcube stipulates the 3D location of the offset reference points.

7. Select the optimization tool by clicking the icon .
- Note the measured dose map plane is shifted by 1 mm along the normal direction of the select plan surface, i.e. to match plan and dose map both the image registration and the 3D surface (plane) positions needs to be varied to optimize.
- Click the '2D' button and selecting 'Surface registration and 3D positioning' as shown below.
.
This starts the comparison optimization and leads to the final result as shown below.

Optimization process stops when optimization criterias are met - click button to display the panel (shown below) to modify optimization parameters.

See parameter settings for more details .

Note: The x axis direction is the normal direction of the plan and offset x component is 1 mm, what is the offset between plan surface and dose map plane.

8. Select any of the available tool to evaluate the comparison - e.g. select isomap tool at vertical tool bar.