Development of a new ball-type phantom for evaluation of the image layer of panoramic radiography

Yeom, Han-Gyeol; Kim, Jo-Eun; Huh, Kyung-Hoe; Yi, Won-Jin; Heo, Min-Suk; Lee, Sam-Sun; Choi, Soon-Chul

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자료유형: 학술저널

저자정보: Yeom, Han-Gyeol (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University) Kim, Jo-Eun (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University) Huh, Kyung-Hoe (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University) Yi, Won-Jin (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University) Heo, Min-Suk (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University) Lee, Sam-Sun (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University) Choi, Soon-Chul (Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University)

저널정보: 대한영상치의학회 Imaging science in dentistry Imaging science in dentistry 제48권 제4호

발행연도: 2018.1

수록면: 255 - 259 (5page)

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Purpose: This study proposes a new ball-type phantom for evaluation of the image layer of panoramic radiography. Materials and Methods: The arch shape of an acrylic resin phantom was derived from average data on the lower dental arch in Korean adult males. Metal balls with a 2-mm diameter were placed along the center line of the phantom at a 4-mm mesiodistal interval. Additional metal balls were placed along the 22 arch-shaped lines that ran parallel to the center line at 2-mm buccolingual intervals. The height of each ball in the horizontal plane was spaced by 2.5 mm, and consequently, the balls appeared oblique when viewed from the side. The resulting phantom was named the Panorama phantom. The distortion rate of the balls in the acquired image was measured by automatically calculating the difference between the vertical and horizontal length using $MATLAB^{(R)}$. Image layer boundaries were obtained by applying various distortion rate thresholds. Results: Most areas containing metal balls (91.5%) were included in the image layer with a 50% distortion rate threshold. When a 5% distortion rate threshold was applied, the image layer was formed with a small buccolingual width along the arch-shaped center line. However, it was medially located in the temporomandibular joint region. Conclusion: The Panorama phantom could be used to evaluate the image layer of panoramic radiography, including all mesiodistal areas with large buccolingual width.

#Phantoms, Imaging #Radiography, Panoramic

참고문헌 (11)

참고문헌 신청

Hassen SM / 1982 / A study of the zone of sharpness of three panoramic x-ray machines and the effect of screen speed on the sharpness zone / Oral Surg Oral Med Oral Pathol 54:242~249

Paiboon C / 1985 / Effect of border sharpness on the size and position of the focal trough of panoramic x-ray machines / Oral Surg Oral Med Oral Pathol 60:670~676

Rafael Henrique Nunes Rondon / 2014 / Common positioning errors in panoramic radiography: A review / Imaging Science in Dentistry 44(1):1~6

Patel JR / 1989 / The focal trough of the Autopan panoramic dental x-ray machine / Oral Surg Oral Med Oral Pathol 68:115~118

Brown CE Jr / 1972 / Dimensions of the focal trough in panoramic radiography / J Am Dent Assoc 84:843~847

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