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A method of magnification correction for posteroanterior radiographic cephalometry.
- Source :
-
The Angle orthodontist [Angle Orthod] 1997; Vol. 67 (2), pp. 137-42. - Publication Year :
- 1997
-
Abstract
- A simple method for magnification correction of width measurements from posteroanterior (PA) cephalograms is presented. Small lead markers were placed on selected landmarks of dry skulls. Lateral and PA cephalograms were obtained for each skull. Seven cephalometric width measurements were selected. Actual widths were deduced from the geometric principle of similar triangles. The magnification factor is the distance between the anode and the transporionic axis, plus or minus the corrected distance of the landmark to the transporionic axis measured from the lateral cephalogram, divided by the distances between the anode and the film. Differences between measurements made directly on the skull and corrected width measurements from the PA films were observed to be very small (< 0.50 mm) and statistically insignificant (P > 0.05). Paired measurements were of high correlation (r = +0.99). The present method of magnification correction means cephalometric width measurements can be made that are comparable in accuracy with measurements made directly on the skulls.
- Subjects :
- Adult
Algorithms
Frontal Bone anatomy & histology
Frontal Bone diagnostic imaging
Humans
Mandible anatomy & histology
Mandible diagnostic imaging
Mastoid anatomy & histology
Mastoid diagnostic imaging
Maxilla anatomy & histology
Maxilla diagnostic imaging
Prostheses and Implants
Reproducibility of Results
Skull anatomy & histology
Skull Base anatomy & histology
Skull Base diagnostic imaging
Zygoma anatomy & histology
Zygoma diagnostic imaging
Cephalometry methods
Radiographic Magnification
Skull diagnostic imaging
Subjects
Details
- Language :
- English
- ISSN :
- 0003-3219
- Volume :
- 67
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- The Angle orthodontist
- Publication Type :
- Academic Journal
- Accession number :
- 9107378
- Full Text :
- https://doi.org/10.1043/0003-3219(1997)067<0137:AMOMCF>2.3.CO;2