Erratum to: Oral Radiol DOI 10.1007/s11282-009-0032-y

We regret that there were some errors in the above-cited article.

  1. 1.

    In Fig. 2, the label for the x axis, “Spatial frequency (lp/mm),” should be “Spatial frequency (lp/cm)”.

  2. 2.

    In Table 2, the units of spatial frequency “ρ50 in 1/mm” and “ρ10 in 1/mm” should be “ρ50 in 1/cm” and “ρ10 in 1/cm,” respectively.

  3. 3.

    In the second paragraph of “Discussion”, in lines 7 and 8, “26.8 lp/mm” and “22.8 lp/mm” should be “26.8 lp/cm” and “22.8 lp/cm,” respectively.

We apologize for these errors and any confusion that they may have caused.