A study of the zone of sharpness of three panoramic x-ray machines and the effect of screen speed on the sharpness zone

Hassen, Siham M; Manson-Hing, L.R.

doi:10.1016/0030-4220(82)90224-9

Cited by 19 publications

(14 citation statements)

References 33 publications

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“…15 In addition, the calcifications outside the focal trough seem blurred, reduced in size or magnified and sometimes distorted. 16 The superimposition of the anatomical structures in the panoramic radiography creates challenges in the interpretation of the images. 8 The differentiation of soft tissue calcifications can be done readily by three-dimensional imaging methods such as CT and CBCT.…”

Section: Discussionmentioning

confidence: 99%

Konik Işınlı Bilgisayarlı Tomografi Kullanılarak Ege Bölgesi’nde Tonsilolit Prevalansının Araştırılması

Kalabalık

Çiftçi

Aytuğar

2019

Kocaeli Üniversitesi Sağlık Bilimleri Dergisi

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Objective: The purpose of this research was to investigate the prevalence rate and characteristics of tonsilloliths in a Turkish population sample living in the Aegean region of Turkey using cone-beam computed tomography. Methods: Three hundred ninety-nine consecutive cone-beams computed tomography data was obtained at the Department of Oral and Dentomaxillofacial Radiology were retrospectively analyzed for the characteristics and presence of tonsilloliths. The subjects were divided into three groups according to age: (1) age ≤20 years; (2) age 21-40 years; (3) age ≥41 years. The correlation between subject demographics and the characteristics (number and prevalence) of tonsilloliths was investigated. Results: The prevalence rate of palatine tonsilloliths in 399 subjects (184 males, 215 females; mean age of 34.3 years) was 25.8%; the prevalence showed no significant difference between male and female genders (p=0.57). A positive correlation was observed between the number of tonsillotihs and age (p=0.002). Tonsillar calcification was significantly more common in Group 3 than Group 1 and 2, while it was significantly lower in Group 1 than the other groups (p=0.036). Conclusion: According to our results, tonsilloliths affect approximately a quarter of the Aegean population. Tonsilloliths are age-related but sexindependent. These calcifications are more common in people older than 40 years of age.

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Section: Discussionmentioning

confidence: 99%

Konik Işınlı Bilgisayarlı Tomografi Kullanılarak Ege Bölgesi’nde Tonsilolit Prevalansının Araştırılması

Kalabalık

Çiftçi

Aytuğar

2019

Kocaeli Üniversitesi Sağlık Bilimleri Dergisi

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“…Panoramic radiography is a technique combining the principles of scanning and tomography [5]. In panoramic radiography, a horizontally narrow slit X-ray beam is used to scan the oral and maxillofacial regions, and the obtained radiograph is recorded on a rotating single large film [4,6]. Due to this acquisition process, the images of the structures located in the arch shaped plane among the three-dimensional areas are most clearly obtained [4,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In panoramic radiography, a horizontally narrow slit X-ray beam is used to scan the oral and maxillofacial regions, and the obtained radiograph is recorded on a rotating single large film [4,6]. Due to this acquisition process, the images of the structures located in the arch shaped plane among the three-dimensional areas are most clearly obtained [4,[6][7][8][9]. This vertical curved plane is called an image layer, sharply depicted layer, focal trough, or the machine's zone of sharpness [4,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Correlation between spatial resolution and ball distortion rate of panoramic radiography

et al. 2020

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Background: The purpose of this study was to analyze the correlation between spatial resolution and ball distortion rate of panoramic radiography and to elucidate the minimum criterion for ball distortion rate, which is very relevant to clinical readability. Methods: Horizontal and vertical spatial resolution and ball distortion rates were calculated in the same position, such as the incisor, premolar, molar, and temporomandibular joint area with various object depths corresponding to 48 mm. Three devices were evaluated. A region showing spatial resolution above the reference standard was selected, and the ball distortion rate corresponding to the same region was divided into horizontal and vertical phantom groups. The mean and standard deviation of the obtained ball distortion rates were calculated. Student's t-test was used to statistically analyze the mean difference in ball distortion rates between vertical and horizontal phantom groups. Results: In all devices, the horizontal line pair phantom, but not the vertical line pair phantom, was readable in all areas measured at the line pair value of at least 1.88 lp/mm. The line pair value tended to be higher toward the center and lower toward the outside. The ball distortion rate tended to decrease closer to the center and increased further away. In addition, ball distortion rates could not be measured at some areas as they were not recognized as balls due to the high degree of distortion at the outermost and innermost sides. The number of balls satisfying the reference value using the horizontal line pair phantom was 102 (mean of ball distortion rates, 20.98; standard deviation, 15.25). The number of balls satisfying the reference value using the vertical line pair phantom was 49 (mean of ball distortion rates, 16.33; standard deviation, 14.25). However, mean ball distortion rate was not significantly different between the two groups. Conclusions: Image layer of panoramic radiography could be evaluated by the spatial resolution using horizontal and vertical line pair phantoms and by assessing ball distortion rates through a ball-type panorama phantom. A ball distortion rate of 20% could be used as a threshold to evaluate the image layer of panoramic radiography.

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“…Panoramic radiography is a technique combining the principles of scanning and tomography [5]. In panoramic radiography, a horizontally narrow slit X-ray beam is used to scan the oral and maxillofacial regions, and the obtained radiograph is recorded on a rotating single large film [4,6]. The radiographic image shows only the image of body structures positioned in the focal layer, in the image layer, or in the machine's zone of sharpness [4,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The method of evaluating the focal layer using lead line pairs was first presented by Hassen et al [6]. Since then, there several studies have evaluated the focal layer using the readability of the lead line pair [15,16].…”

Section: Introductionmentioning

confidence: 99%

Correlation between spatial resolution and ball distortion rate of panoramic radiography

Yeom

Lee

Kim

et al. 2020

Preprint

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BackgroundThe purpose of this study was to analyze the correlation between spatial resolution and ball distortion rate of panoramic radiography and to elucidate the minimum criterion for ball distortion rate, which is very relevant to clinical readability.MethodsHorizontal and vertical spatial resolution and ball distortion rates were calculated in the same position, such as the incisor, premolar, molar, and temporomandibular joint area with various object depths corresponding to 48 mm. Three devices were evaluated. A region showing spatial resolution above the reference standard was selected, and the ball distortion rate corresponding to the same region was divided into horizontal and vertical phantom groups.The mean and standard deviation of the obtained ball distortion rates were calculated. Student’s t-test was used to statistically analyze the mean difference in ball distortion rates between vertical and horizontal phantom groups.ResultsIn all devices, the horizontal line pair phantom, but not the vertical line pair phantom, was readable in all areas measured at the line pair value of at least 1.88 lp/mm. The line pair value tended to be higher toward the center and lower toward the outside. The ball distortion rate tended to decrease closer to the center and increased further away. In addition, ball distortion rates could not be measured at some areas as they were not recognized as balls due to the high degree of distortion at the outermost and innermost sides. The number of balls satisfying the reference value using the horizontal line pair phantom was 102 (mean of ball distortion rates, 20.98; standard deviation, 15.25). The number of balls satisfying the reference value using the vertical line pair phantom was 49 (mean of ball distortion rates, 16.33; standard deviation, 14.25). However, mean ball distortion rate was not significantly different between the two groups.ConclusionsFocal layer of panoramic radiography could be evaluated by the spatial resolution using horizontal and vertical line pair phantoms and by assessing ball distortion rates through a ball-type panorama phantom. A ball distortion rate of 20% could be used as a threshold to evaluate the focal layer of panoramic radiography.

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A study of the zone of sharpness of three panoramic x-ray machines and the effect of screen speed on the sharpness zone

Cited by 19 publications

References 33 publications

Konik Işınlı Bilgisayarlı Tomografi Kullanılarak Ege Bölgesi’nde Tonsilolit Prevalansının Araştırılması

Konik Işınlı Bilgisayarlı Tomografi Kullanılarak Ege Bölgesi’nde Tonsilolit Prevalansının Araştırılması

Correlation between spatial resolution and ball distortion rate of panoramic radiography

Correlation between spatial resolution and ball distortion rate of panoramic radiography

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