Image Owl supports all CBCT tests suggested by Varian provided in their Installation Product Appectance guidelines, outlined below. Catphan® 504 and Catphan® 604 versions are automatically identified and analyzed.
Scanning ModesCBCT Scans
The following scan modes are used to demonstrate basic CBCT operation, functionality, and conformance.
- Standard Dose Head (full fan)
- Pelvis (half fan)
Phantom Setup
Position the phantom on the front edge of the couchtop, using the storage box as the holder.
Align the phantom as follows:
- VRT Axis: Wall lasers intersecting the side reflective dots on phantom
- LAT Axis: Overhead or Sagittal laser intersecting the top reflective dots on phantom
- LNG Axis: Middle of the Low Contrast module CTP515 aligned to wall vertical laser
Before continuing, rotate the gantry 360º around the Catphan® phantom to make sure there are no collision possibilities.
Scanning Test Method
CBCT Mode | Standard Dose Head | Pelvis |
---|---|---|
New Patient ID |
ID: 1111 Last Name: IPA First Name: HEAD |
ID: 2222 Last Name: IPA First Name: PELVIS |
Patient Orientation | Head First - Supine | Head First - Supine |
Scan Diameter | 24 cm (PA and LR axis) | 30 x 30 cm (PA and LR axis) |
Bow Tie Filter | Full Fan | Half Fan |
Resolution | 384 x 384 | 384 x 384 |
Slice Thickness | 2.5 mm | 2.5 mm |
Topograms | Not required | Not required |
Equipment/Tool | Catphan® phantom | Catphan® phantom |
- With the Clinac in CLINICAL mode, launch Treatment on the 4DITC and verify the PRO values (from the LVI) are displayed in the Treatment application.
- Open the test patient CATPHAN plan from the Treatment Queue, and mode up the CBCT setup field. Use DICOM RT mode and perform a Machine Override if the patient is not imported into the OIS and/or not available in the Treatment Queue.
- Close the OBI application and launch the CBCT application.
- Open a New Patient and enter a New Patient ID, using the ID names shown in the setup table for the applicable scan mode.
- Select Acquire new scan and follow the on-screen instructions to acquire the desired scan mode.
Verification Tests
The full set of DICOM files from each scan mode can now be uploaded to Catphan® QA for analysis.
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