Table 6.
Effective doses of thyroid with and without application of thyroid collar (μSv)
| Machine | No collar | One collar | Two collars |
| OP200 | 1.12 | 1.01 | 1.06 |
| Orthophos CD | 2.71 | 2.45 | 2.17 |
| Orthophos XG plus | 2.18 | 1.76a | 1.66a |
| ProMax® | 2.20 | 1.70a | 1.82a |
a
Significant differences between doses obtained with and without the use of the thyroid collar(s).
Orthopantomograph OP200 is manufactured by Instrumentarium Dental, Tuusula, Finland; Orthophos CD by Sirona Dental Systems GmbH, Bensheim, Germany; Orthophos XG plus by Sirona Dental Systems GmbH; and ProMax by Planmeca Oy, Helsinki, Finland.