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Features
• Can be used for multi-slice CT and Cone Beam CT
• Can be configured for central axis and off-set measurements
• Manufactured from durable epoxy
• Tissue equivalent inserts can be positioned at 17 different locations
• Special marker inserts enable quick assessment of distance registration
• All materials accurately simulate indicated tissue within CT and Cone beam CT energy range
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The Cone beam (CBCT) Electron Density Phantom is an extended version of the CIRS Model 062A Electron Density Phantom and specifically designed for Cone Beam CT Imaging systems. Preliminary data shows that there may be differences between the HU readings for Diagnostic CT and Cone Beam CT. The geometry of the Cone Beam CT requires additional material and suggests that off central axis measurements should be taken.
The phantom was designed in collaboration with Dr. Peter Cossmann1, PhD to provide a reliable tool for CT number to electron density calibration in volumetric imaging. Reliable CT calibration curves help enable treatment plan adaptation directly from Cone Beam CT data. Additionally, the phantom accommodates any ion chamber for dose measurements and validation of heterogeneity correction based on the corrected CT calibration curve.
The Model 062A OBI Electron Density Phantom measures 33 cm W x 27 cm H x 25 cm L and therefore covers geometries for imager dimensions of up to 40 cm x 40 cm. It is made of Plastic Water®. The phantom contains the same set of tissue equivalent electron density inserts as the standard Model 062 and has additional interchangeable slabs allowing for repositioning of electron density section with an increment of 2.5 cm.
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