Summary of Metallic Plates/Sheets Used for Cranioplasty and Phantom Study
| Type of Metallic Plate/Sheet | Aluminum | Stainless Steel | Tantalum | Lead |
|---|---|---|---|---|
| Mass attenuation coefficient for 140 keV photon (cm2/g) | 0.143 | NA | 1.825 | 2.393 |
| Density (g/cm3) | 2.70 | NA | 16.65 | 11.35 |
| Reported metallic plate thickness used for cranioplasty (cm) | 0.064 | 0.046 | 0.038, 0.051 | NA |
| Theoretical attenuation for reported metallic plate (%) | 2 | NA | 68, 79 | NA |
| Experimental metallic sheet thickness used for phantom study (cm) | 0.064 | 0.061 | NA | 0.038, 0.076 |
| Theoretical attenuation for experimental metallic sheet (%) | 2 | NA | NA | 64, 87 |
| Calculated attenuation from planar image (%) | 4 | 9 | NA | NA, 83 |
Mass attenuation coefficient and density information obtained from www.physics.NIST.gov Web site’s reference tables of x-ray mass attenuation coefficients.