Journal ArticleDOI
Blurring and layer thickness in narrow beam rotation radiography.
U. Welander,G. Wickman +1 more
TLDR
Experimental tests were performed, which confirm the mathematically presented hypothesis and also confirm the validity of the mathematical model of narrow beam rotation radiography presented by WELANDER (1974).Abstract:
The definition of the blurring of narrow beam rotation radiography is revived. The relative value of the blurring is considered to be the most reliable measurement. Calculations of the layer thickness should be based on the definition of the relative blurring. Experimental tests were performed, which confirm the mathematically presented hypothesis and also confirm the validity of the mathematical model of narrow beam rotation radiography presented by WELANDER (1974).read more
Citations
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Journal ArticleDOI
The effect of vertical and horizontal head positioning in panoramic radiography on mesiodistal tooth angulations.
Ian W. Mckee,Kenneth E. Glover,Philip C. Williamson,Ernest W.N. Lam,Giseon Heo,Paul W. Major +5 more
TL;DR: It was concluded that the clinical assessment of mesiodistal tooth angulation with panoramic radiography should be approached with extreme caution with an understanding of the inherent image distortions that can be further complicated by the potential for aberrant head positioning.
Journal ArticleDOI
Effect of head positioning in panoramic radiography on vertical measurements: an in vitro study.
TL;DR: The line between the articular eminences is unsuitable as a reference line for measurements of the tooth-bearing areas because a slight misalignment of the head does not significantly affect the vertical measurements in the mandible or of the posterior maxilla if the reference lines are in the same vertical plane as the teeth.
Journal ArticleDOI
History of panoramic radiography
TL;DR: The panoramic technique originated from the need to image the jaws, but it was also applied to other anatomic regions, before CT became available, and is an essential element in oral radiology today.
Journal ArticleDOI
Dental and mandibular arch widths in three ethnic groups in Texas: a radiographic study.
Pirkka V. Nummikoski,Tom Prihoda,Robert P. Langlais,William D. McDavid,Ulf Welander,Gunilla Tronje +5 more
TL;DR: The study revealed that ethnic and sexual differences in the dental and mandibular arch widths were statistically significant and males were 0.6 to 1.1 mm wider in their dentitions than females.
Journal ArticleDOI
A study of the zone of sharpness of three panoramic x-ray machines and the effect of screen speed on the sharpness zone
S.M. Hassen,L.R. Manson-Hing +1 more
TL;DR: Sharpness zones of the Orthopantomograph-5, Autopan, and Panorex were delineated with the use of a standard multiline test object and focal troughs of all machines covered most tooth positions.
References
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Journal ArticleDOI
A new tomographical method for radiographing curved outer surfaces.
Journal ArticleDOI
A Mathematical Model of Narrow Beam Rotation Methods
TL;DR: A method for exposing panoramic images of the jaws, using a rotating beam, was developed from the works presented by PAATERO (1949, 1954), and is today in wide use in odontologic roentgen examinations.
Journal ArticleDOI
Layer formation in narrow beam rotation radiography.
TL;DR: The layer formation in rotation narrow beam radiography is analysed mathematically and it is shown that the blurring, and consequently the layer formation, is due primarily to the width of the beam.
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A study of the focal troughs of three panoramic dental x-ray machines. Part I. The area of sharpness.
T.M. Lund,L.R. Manson-Hing +1 more