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APPLICATION OF IMAGE ANALYSIS METHODS FOR ISOCENTER QUALITY ASSURANCE IN RADIOTHERAPY

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Figure

Fig. 2. Images of a ball marker and a source in the  detector plane.
Fig. 3. A typical projection image of a cubic phantom  with a ball marker inside. A radiation center is by  definition the center of the crosshair
Fig. 6. Typical horizontal profile of the distance the  ionizing radiation travels through the volume of the  phantom
Fig. 8. Horizontal profiles of a phantom image before  (a) and after (b) taking logarithms of gray values
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