Comparison of measurement errors between conventional, digital cephalographs and hardcopies

Lee,  Tae-Ho; Lee,  Ki-Soo; Nam,  Jong-Hyun; Kang,  Yoon-Goo

doi:2009.47.5.282

J Korean Dent Assoc > Volume 47(5); 2009 > Article

The Journal of The Korean Dental Association 2009;47(5):282-290.
DOI: https://doi.org/10.22974/jkda.2009.47.5.004 Published online May 31, 2009.

일반 및 디지탈 측모두부방사선 규격사진, 하드카피의 계측오차 또는 확대율 비교

이태호¹, 이기수², 남종현³, 강윤구⁴

^¹경희대학교 일반대학원 치의학과 교정학
^²경희대학교 치의학전문대학원 교정학교실
^³경희대학교 치의학전문대학원 교정학교실
^⁴경희대학교 치의학전문대학원 교정학교실

Comparison of measurement errors between conventional, digital cephalographs and hardcopies

Tae-Ho Lee¹, Ki-Soo Lee², Jong-Hyun Nam³, Yoon-Goo Kang⁴

¹Department of Orthodontics, Graduate School of Dentistry, Kyung Hee University
²Department of Orthodontics, Professioanl Graduate School of Dentistry, Kyung Hee University
³Department of Orthodontics, Professioanl Graduate School of Dentistry, Kyung Hee University
⁴Department of Orthodontics, Professioanl Graduate School of Dentistry, Kyung Hee University

Abstract

The purpose of this study was to evaluate the measurement error between conventional films, digital cephalographs and hardcopy. The material consisted of 29 cephalographs which used image modality of Asahi CX-90SP in the Kyung Hee University Dental Hospital. One observer measured fiducial measurements at an interval of four weeks. Measurement error was tested by Dahlberg's formula. A paired t-test was used to detect it between each modality. The results are as follows; 1. The monitor-displayed digital image showed enlargement compared with the conventional image. The cephalometric measurements of the monitor-displayed digital image and conventional image were no statistically significant difference except SNB. 2. In conventional image, measurement errors of linear and angular measurements were 0.23mm, 0.36°, respective. In monitor-displayed digital image, measurement errors of linear and angular measurements were 0.63mm, 0.48° respective. 3. The reduction ratio of hardcopy was 1.01% compared to the monitor-displayed digital image. Based on the results, it indicates that the digital cephalographs and hardcopy using storage phosphor digital radiography showed the same accuracy as the conventional films in clinical use.

Key Words: measurement error;digital cephalographs;hardcopy;