Calibration of Patient Positioning System using FPD at HIMAC
| Autor: | Nitta, Kazunori, et.al |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Popis: | Patient positioning is one of important procedures in radiation therapy because it is necessary to position patients properly according to their treatment planning. Flat Panel Detectors (FPDs) was installed for patient position detection system using X-ray in place of image instensifier tubes at National Institute of Radiological Sciences in August, 2009. FPD has many advantages compared with Image Intensifier tube; a) no image distortion, b) higher position resolution, c) wider dinamic range and d) decrease in halation effect due to density differnece. I report the installation of new positoning system including FPD, softwares and networking. I also show QC/QA procedures for FPDs. After installing this system, I measured FPD performance and calibrated FPD position and pixel spacing which means the distance beteween pixels at iso-center. To measure the pixel spacing, I tried three kinds of methods (calculating geometrically, pointing manually two points on a grid board between which distance is known, and analyzing automatically image of grid by computer.) Values of pixel spacing by three methods are all consistent. I summarized checking list for QA. Now new paitient positioning system is normally in operation. Whenever problem about FPD happens, I work to settle it immidiatelly. Now new positioning system is working very well. FPD degradation due to the irradiation beam will be studied. PTCOG49 |
| Databáze: | OpenAIRE |
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