Patent ID: 7755031
Filing Date: 2010-07-13
Classification: A61B,A61N

Abstract:
1. A calibration phantom for quality assurance placed on a couch of an image-based radiotherapy apparatus, which includes a computed tomography apparatus and a radiation treatment machine combined with the computed tomography apparatus, and is provided for quality assurance of the computed tomography apparatus and the radiation treatment machine based on an image scanned by the computed tomography apparatus and the radiation treatment machine, the calibration phantom comprising: a body comprising a cylindrical acryl member having a predetermined diameter, wherein the body has a center hole at a center axis thereof and a plurality of through-holes in outer circumferential portions thereof at a predetermined interval from the center hole; round stick-type density bars inserted into corresponding ones of the through-holes of the body, with cross-sectional shapes thereof appearing on the image scanned by the computed tomography apparatus and the radiotherapy apparatus, the density bars made of materials each with different densities; an acrylic cover detachably coupled with both ends of the body and having the same diameter as the body; and a plurality of bolts closely fastening the body with the cover by extending through the cover and the body and coupling with nuts, with cross-sectional shapes thereof appearing on the image scanned by the computed tomography apparatus and the radiotherapy apparatus, the bolts each made of different materials.