Characteristics of the Orthopantomograph OP 100.

Scarfe, William C.; Eraso, Francisco Eduardo; Farman, Allan G.

doi:10.1038/sj.dmfr.4600310

Cited by 41 publications

(36 citation statements)

References 18 publications

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“…This difference in results can be explained by the methodology used in present study, which used a high-precision customized phantom, in which the distance between spheres was 0.5 cm, and the images were obtained for each column of each quadrant in an independent manner. Previous studies (2,8,18,20) have reported that the shape and location of the image layer also differed between various panoramic machines. Paiboon and Manson-Hing (20) comparing the image layer of 4 different panoramic machines observed differences among them, which resulted in changes in image formation.…”

Section: Discussionmentioning

confidence: 95%

“…Since image formation in panoramic radiography comprises a large number of surrounding anatomical structures in addition to the dental arch, the image layer has three dimensions, i.e., height, width and length. In a previous study, Scarfe et al (8) evaluating a panoramic machine similar to the model used in the present study, an OP 100 unit, an image layer with similar shape as that of the dental arch was also observed. However, differently from the present study, a large middle portion of the image layer with constant vertical and horizontal magnifications was observed.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the cause of image distortion is the change in rotation speed of the x-ray beam, which alters the position of effective focus in the image layer along the horizontal axis, in both the length and height of the image layer. Scarfe et al (8) found an image layer with lower magnification for the maxilla and higher magnification for the mandible. Brown et al (2), on the other hand, found no change in magnification when evaluating the image layer vertically.…”

Section: Discussionmentioning

confidence: 99%

“…The image layer has a curved shape, and is three-dimensional, constituted of three different portions: middle, inner and outer. In the middle portion, magnification factors for vertical and horizontal axes of the image are similar, while in the inner and outer portions they are dissimilar, mainly due to magnification of the horizontal axis responsible for causing the image distortion (8). Thus, considering that panoramic radiographic image quality is dependent on the image layer, which differs from one panoramic x-ray machine to another, the aim of this study was to determine the size, shape and position of the image layer by evaluating the …”

Section: Evaluation Of the Panoramic Image Formation In Different Anamentioning

confidence: 99%

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Evaluation of the panoramic image formation in different anatomic positions

et al. 2010

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The aim of this study was to determine size, shape and position of the image layer by evaluation of the radiographic image formation in different anatomic positions. A customized phantom was made of a rectangular acrylic plate measuring 14 cm² and 0.3 cm thick, with holes spaced 0.5 cm away and arranged in rows and columns. Each column was separately filled with 0.315 cm diameter metal spheres to acquire panoramic radiographs using the Orthopantomograph OP 100 unit. The customized phantom was placed on the mental support of the device, with its top surface kept parallel to the horizontal plane, and was radiographed at three different heights from the horizontal plane, i.e., the orbital, occlusal and mandibular symphysis levels. The images of the spheres were measured using a digital caliper to locate the image layer. The recorded data were analyzed statistically by the Student's-t test, ANOVA and Tukey's test (α=0.05). When the image size of spheres in horizontal and vertical axes were compared, statistically significant differences (p<0.05) were observed in all areas, portions of the image layer and heights of horizontal plane evaluated. In the middle portion of the image layer, differences in the image size of spheres were observed only along the horizontal axis (p<0.05), whereas no differences were observed along the vertical axis (p>0.05). The methodology used in this determined the precise size, shape and position of the image layer and differences in magnification were observed in both the horizontal and vertical axes.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Evaluation Of the Panoramic Image Formation In Different Anamentioning

confidence: 99%

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Evaluation of the panoramic image formation in different anatomic positions

et al. 2010

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“…[4][5][6] Image distortion, due to variations in the degree of magnification in the horizontal and vertical planes, is well described for conventional film-based panoramic radiography. [7][8][9][10][11] As direct digital panoramic machines are not significantly different from conventional panoramic units, the degree of vertical magnification due to projection geometry is similar for digital and conventional rotational panoramic radiographs. Owing to varying magnification, reference objects with known dimensions are required to determine the exact magnification in a particular area.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of vertical height measurements on direct digital panoramic radiographs using posterior mandibular implants and metal balls as reference objects

Vazquez¹,

Nizamaldin²,

Combescure³

et al. 2013

Dentomaxillofacial Radiology

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Objectives: Conventional panoramic radiography, a widely used radiographic examination tool in implant treatment planning, allows evaluation of the available bone height before inserting posterior mandibular implants. Image distortion and vertical magnification due to projection geometry is well described for rotational panoramic radiographs. To assess the accuracy of vertical height measurements on direct digital panoramic radiographs, implants and metal balls positioned in the posterior mandible were used as radio-opaque reference objects. The reproducibility of the measuring method was assessed by the inter-and intraobserver agreements. Methods: Direct digital panoramic radiographs, performed using a Kodak 8000C (Eastman Kodak Company, Rochester, NY), of 17 partially edentulous patients (10 females, 7 males, mean age 65 years) were selected from an X-ray database gathered during routine clinical evaluation of implant sites. Proprietary software and a mouse-driven calliper were used to measure the radiological length of 25 implants and 18 metal reference balls, positioned in mandibular posterior segments. The distortion ratio (DR) was calculated by dividing the radiological implant length by the implant's real length and the radiological ball height by the ball's real height. Results: Mean vertical DR was 0.99 for implants and 0.97 for balls, and was unrelated to mandibular sites, side, age, gender or observer. Inter-and intraobserver agreements were acceptable for both reference objects. Conclusions: Vertical measurements had acceptable accuracy and reproducibility when a software-based calibrated measurement tool was used, confirming that digital panoramic radiography can be reliably utilized to determine the pre-operative implant length in premolar and molar mandibular segments. Dentomaxillofacial Radiology (

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