An open source toolkit for converting and processing Cyberknife images to DICOM files for TG-142 QA. 1 Kirkpatrick
2 Rahman
2 Kalantzis
Steve , Mushfiqur , George 1. Broward Medical Center, Pompano Beach, FL, 334412. 2. Florida Atlantic University, Boca Raton, FL, 33431
INTRODUCTION
METHODS (CONTINUED)
Quality Assurance procedures play a vital role in the proper function of the medical equipment of a radiation oncology department, as well as, constitute a large part of the daily clinical activities of a medical physicist. According to TG-142 report, QA of the onboard imager are required on a monthly basis. Despite the fact that several commercial phantoms with accompanied software are available for Linacs there is no available software for the onboard X-ray imagers of the Cyberknife (CK) system. One of the reasons is the proprietary format that the CK system is utilizing to save the images from the digital panels. We have developed an open source toolkit for processing and converting the CK images to dicom format. Our software was tested by performing the analysis of the QCkV-1 phantom images obtained with a G4 CyberKnife.
In Figure 2, we present an user-friendly graphical user interface which is can be run using an executable file. The GUI features conversion of the HIS images of different sizes. It also features image histogram, rotation, choosing window and level. The procedures to use the software follows as: Ø Ø Ø Ø Ø Ø
MOTIVATION The proprietary format that the CK system is utilizing to save the images from the digital panels is called ‘HIS’. However, most analysis requires image to be in DICOM format. To solve this issue, we have developed a software that converts HIS image file to DICOM format which enables us to have a visual image and analyze it using different software programs.
ILLUSTRATION
Open Image Choose size Choose image window and level Shift and rotate image if required Save image as DICOM Use the DICOM image to Analyze using PIPSproTM or any other software of interest.
RESULTS & DISCUSSION
FIGURE 1: PIPSpro QC-kv1 phantom setup
METHODS The images were acquired using Cyberknife KV imager with the PipsPro QC-KV1 phantom. The phantom was set up at 45o to the imager panel to prevent aliasing on the resolution pattern. Then two back to back images were acquired. The initial step to analyze the Cyberknife raw image is convert the HIS file to a DICOM file so that we can analyze it. HIS files have a short header followed by the unsigned 16-bit image data. The image size is encoded in the header which is usually 512 x 512 or 1024 x 1024. Then the data has to be read and reshaped as required which is performed by our software and finally convert the image to DICOM file. Finally the newly converted DICOM images are used to perform planar imaging QA using PIPSproTM .
Figure 3: Analysis of Planar KV image using PIPSpro.
FIGURE 2: Graphical User interface to convert HIS to DICOM
The HIS files acquired using Cyberknife KV imager at Broward Medical Center were converted to DICOM image successfully. Finally, the DICOM image was analyzed without any issue using PIPSproTM as presented in figure 3 where we observe the planar result and RMTF curve.
Contact:
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