Linear measurement accuracy of dental CT images obtained by 64-slice multidetector row CT: the effects of mandibular positioning and pitch factor at CT scanning.
OBJECTIVE
To evaluate whether the measurement accuracy of dental CT images is affected by the mandibular positioning and the pitch factor at CT scanning.


METHODS
Three dry mandibles were scanned by 64-slice multidetector row CT (MDCT) and micro-CT. For MDCT scanning, 7 different mandibular positioning and 3 different pitch factors were applied. After reformatting dental CT images, the bone height was measured on these images. It was also measured on the corresponding micro-CT image, which was defined as the actual value. The difference of the measurement values between these 2 was defined as the measurement error.


RESULTS
There was no significant difference in the measurement errors due to either the mandibular positioning or the pitch factor.


CONCLUSIONS
The measurement accuracy of dental CT images obtained was not affected by either mandibular positioning or pitch factor at CT scanning.
Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
Yosuke
Y
Kamiyama
Shin
S
Nakamura
Tatsuhiko
T
Abe
Motohiro
M
Munakata
Yoshikazu
Y
Nomura
Hiroshi
H
Watanabe
Masako
M
Akiyama
Toru
T
Kurabayashi
D000539:Alveolar Process / Q000000981:diagnostic imaging; D019412:Anatomy, Cross-Sectional / Q000706:statistics & numerical data; D002508:Cephalometry / Q000706:statistics & numerical data*; D003287:Contrast Media; D003724:Dental Arch / Q000000981:diagnostic imaging; D057918:Fiducial Markers; D006171:Gutta-Percha; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000706:statistics & numerical data; D008334:Mandible / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D061330:Multidetector Computed Tomography / Q000379:methods / Q000706:statistics & numerical data*; D015588:Observer Variation; D019228:Tooth Crown / Q000000981:diagnostic imaging; D055114:X-Ray Microtomography / Q000706:statistics & numerical data
D003287:Contrast Media; D006171:Gutta-Percha