Effects of errors in film speed and beam alignment on the image layer in rotational panoramic radiography

McDavid, William D.; Tronje, Gunilla; Welander, Ulf; Morris, Charles

doi:10.1016/0030-4220(81)90369-8

Cited by 13 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for the 3D imaging and lateral cephalometric images, the positioning of the specimen has very little effect. However, the OPG is highly sensitive to positioning issues that can lead to the magnification of errors and disproportional enlargement (54)(55)(56)(57)(58)(59). Vertical measurements appear to be more accurate than horizontal or angular measurements.…”

Section: Discussionmentioning

confidence: 99%

Assessing the length of the mandibular ramus and the condylar process: a comparison of OPG, CBCT, CT, MRI, and lateral cephalometric measurements

Markic¹,

Müller²,

Patcas³

et al. 2014

EORTHO

View full text Add to dashboard Cite

All 3D imaging procedures yielded nearly equal results when used to measure the CondProc and RH. MRI is recommended because it avoids ionizing radiation and has higher sensitivity in the detection of inflammation. A 2-year threshold for detecting growth in the follow-up period should be taken into account for all 3D imaging methods. Measuring the RH is recommended for the follow-up of condylar growth because reference values for annual increments are published.

show abstract

Section: Discussionmentioning

confidence: 99%

Assessing the length of the mandibular ramus and the condylar process: a comparison of OPG, CBCT, CT, MRI, and lateral cephalometric measurements

Markic¹,

Müller²,

Patcas³

et al. 2014

EORTHO

View full text Add to dashboard Cite

show abstract

“…In addition, the magnification factors of the vertical directions were less varied than those of the horizontal directions,17 and the variability of the horizontal magnification factors was high 16,18. These originated from the changes in the position16 and a motion factor,16,19,20 which was related to the horizontal rotational movement of a panoramic radiograph machine. In other words, when changing the antero-posterior position of the patients, the magnification or reduction in the size of the horizontal component would be more prominent than that of the vertical component on panoramic radiographs because of the motion factor of panoramic machines 16,19,20.…”

Section: Introductionmentioning

confidence: 95%

“…These originated from the changes in the position16 and a motion factor,16,19,20 which was related to the horizontal rotational movement of a panoramic radiograph machine. In other words, when changing the antero-posterior position of the patients, the magnification or reduction in the size of the horizontal component would be more prominent than that of the vertical component on panoramic radiographs because of the motion factor of panoramic machines 16,19,20. Thus, measuring horizontal length changes would be appropriate to evaluate the reproducibility of panoramic radiographs.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the reproducibility of panoramic radiographs between dentulous and edentulous patients

Park

Huh

et al. 2014

Imaging Sci Dent

View full text Add to dashboard Cite

PurposeThis study was performed to evaluate the reproducibility of panoramic radiographs of dentulous and edentulous patients.Materials and MethodsThe reproducibility of panoramic radiographs was evaluated using the panoramic radiographs acquired from 30 anterior dentulous patients by using a common biting positioning device (dentulous group) and 30 anterior edentulous patients by using chin-support devices to take a panoramic radiograph (edentulous group), respectively; these patients had undergone 3 or more panoramic radiographs. The widths and angles between the designated landmarks were measured on the panoramic radiographs, and the reproducibility was evaluated using the intraclass correlation coefficient (ICC) and the coefficient of variation.ResultsIn the dentulous and edentulous groups, the ICCs of the mandibular ramus and mandibular angle areas were higher than the condylar head and zygomatic areas. The mandibular ramus and angle areas showed statistically lower mean coefficients of variation than the condylar head and zygomatic areas in the dentulous group. The mandibular angle area showed a significantly lower mean coefficient of variation than the zygomatic area in the edentulous group. By comparing the two groups, each ICC of the edentulous group was lower than that of the dentulous group, and the mean coefficients of variation of the mandibular ramus area, zygomatic area, left condylar inclination, and ramus ratio between the right and the left in the edentulous group were significantly higher than those in the dentulous group.ConclusionBiting positioning for dentulous patients provided better positioning reproducibility than chin-support positioning when performing panoramic radiography for edentulous patients.

show abstract

“…An appropriate diagnosis of asymmetries before treatment is prudent for addressing the treatment limitations and therapeutic options. Although most practitioners do not use panoramic images for the diagnosis of a mandibular asymmetry,89 some researchers do support their use. According to Mattila et al,7 panoramic radiography can be used for determining the gonial angle more accurately than lateral cephalography, as the right and left gonial angles can be measured individually without any superimposition.…”

Section: Introductionmentioning

confidence: 99%

Dilemma of gonial angle measurement: Panoramic radiograph or lateral cephalogram

Radhakrishnan¹,

Varma²,

Ajith³

2017

Imaging Sci Dent

View full text Add to dashboard Cite

PurposeThe purpose of this study was to evaluate the accuracy of panoramic imaging in measuring the right and left gonial angles by comparing the measured angles with the angles determined using a lateral cephalogram of adult patients with class I malocclusion.Materials and MethodsThe gonial angles of 50 class I malocclusion patients (25 males and 25 females; mean age: 23 years) were measured using both a lateral cephalogram and a panoramic radiograph. In the lateral cephalograms, the gonial angle was measured at the point of intersection of the ramus plane and the mandibular plane. In the panoramic radiographs, the gonial angle was measured by drawing a line tangent to the lower border of the mandible and another line tangent to the distal border of the ascending ramus and the condyle on both sides. The data obtained from both radiographs were statistically compared.ResultsNo statistically significant difference was observed between the gonial angle measured using the lateral cephalograms and that determined using the panoramic radiographs. Further, there was no statistically significant difference in the measured gonial angle with respect to gender. The results also showed a statistically insignificant difference in the mean of the right and the left gonial angles measured using the panoramic radiographs.ConclusionAs the gonial angle measurements using panoramic radiographs and lateral cephalograms showed no statistically significant difference, panoramic radiography can be considered in orthodontics for measuring the gonial angle without any interference due to superimposed images.

show abstract

Effects of errors in film speed and beam alignment on the image layer in rotational panoramic radiography

Cited by 13 publications

References 3 publications

Assessing the length of the mandibular ramus and the condylar process: a comparison of OPG, CBCT, CT, MRI, and lateral cephalometric measurements

Assessing the length of the mandibular ramus and the condylar process: a comparison of OPG, CBCT, CT, MRI, and lateral cephalometric measurements

Comparison of the reproducibility of panoramic radiographs between dentulous and edentulous patients

Dilemma of gonial angle measurement: Panoramic radiograph or lateral cephalogram

Contact Info

Product

Resources

About