Table 3.
Summary of quantitative results for three anthropomorphic phantoms with metal implants. Listed for each phantom are the number of images analyzed, the mean percentage of bad pixels for those images, and the error metric Merror, which takes into account both the number of bad pixels and the magnitude of CT number errors of the bad pixels.
| Imaging technique | Hip prosthesis | Dental fillings | Spine stabilization rods | ||||||
|---|---|---|---|---|---|---|---|---|---|
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| No. of images | % bad pixels | Merror | No. of images a | % bad pixels | Merror | No. of images | % bad pixels | Merror | |
| Philips 120kVp | 36 | 46.6 | 61.0 | 6 | 27.2 | 50.1 | 21 | 6.9 | 7.9 |
| O-MAR | 36 | 31.6 | 29.6 | 6 | 25.0 | 41.0 | 21 | 9.1 | 7.2 |
| GE 120kVp | 44 | 36.8 | 38.0 | 6 | 22.4 | 41.7 | 21 | 12.2 | 12.9 |
| GSI 70keV | 44 | 33.8 | 36.4 | 6 | 22.8 | 42.2 | 21 | 19.2 | 22.0 |
| GSI 140keV | 44 | 29.2 | 32.5 | 6 | 20.4 | 38.0 | 21 | 5.9 | 4.3 |
| MARs 70keV | 44 | 19.1 | 15.1 | 6 | 32.6 | 55.8 | 21 | 17.4 | 12.7 |
| MARs 140keV | 44 | 12.1 | 10.0 | 6 | 24.7 | 35.5 | 21 | 11.6 | 8.0 |
a
Includes two images (one superior and one inferior to the images containing the metal fillings) that do not contain any metal