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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (1): 75-79. doi: 10.19723/j.issn.1671-167X.2019.01.014

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Diagnostic accuracy of cone beam computed tomography with different resolution settings for external root resorption

Xiao-yan XIE1,Shu-mei JIA2,Zhi-hui SUN3,Zu-yan ZHANG1,△()   

  1. 1. Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    2. Department of Engineering Physics, Tsinghua University & Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Beijing 100084, China
    3. Department of Dental Materials, Peking University School and Hospital of Stomatology, Beijing 100081, China
  • Received:2018-09-29 Online:2019-02-18 Published:2019-02-26
  • Contact: Zu-yan ZHANG E-mail:zhangzy-bj@vip.sina.com
  • Supported by:
    Supported by National Natural Science Foundation of China(11435007);and Scientific Foundation of Peking University School of Stomatology(2011-7)

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Abstract:

Objective: To evaluate the diagnostic accuracy of cone beam computed tomography (CBCT) with different resolution settings in detecting the simulated external root resorption defects. Methods: External root resorption defects were simulated in 51 human single rooted premolar teeth. Ca-vities simulating root resorption defects of 1 mm in diameter and 0.1 mm, 0.2 mm, and 0.3 mm in depth were drilled in the cervical, middle and apical thirds of lingual surfaces of the teeth. In addition to the 51 locations as controls, a total of 102 cavities were obtained in the present study. Specimens were placed in a human dry mandible and scanned by ProMax 3D and DCT PRO CBCT with different resolution settings, respectively. The three-dimensional CBCT images were evaluated by two experienced observers. The data were analyzed with receiver operating characteristics (ROC) analysis. ROC curves were generated and the area under ROC curve (Az) was employed to express the diagnostic accuracy. Results: The diagnostic accuracy (Az value) of ProMax 3D CBCT with high, normal and low resolution settings were 0.867, 0.703 and 0.665 (P < 0.05), respectively. Defects with depths of 0.2 mm and 0.3 mm were easier to be detected than those with depths of 0.1 mm (P < 0.05). The images obtained by high resolution mode scanning had obvious advantages in detecting smaller defects (depth 0.1 mm and 0.2 mm). The DCT PRO CBCT provided 4 resolution settings including normal quality + normal resolution, normal quality + high resolution, high quality + normal resolution and high quality + high resolution. The Az values for those 4 resolution settings were 0.527, 0.725, 0.743, and 0.794 (P < 0.05), respectively. Similar to ProMax 3D CBCT, the scanning mode with high resolution played a better role in detecting the defects with depth of 0.1 mm. Except for the scanning setting mode with normal quality + normal resolution, the other three modes could well be evaluated for the defects with depth of 0.2 mm and 0.3 mm. Conclusion: It is concluded that the diagnostic ability for external root resorption of CBCT could be affected by resolution settings. Computer-aid imaging method can improve the CBCT diagnostic accuracy for external root resorption without increasing the radiation dose level during CBCT scanning.

Key words: Root resorption, Cone beam computed tomography, Resolution

CLC Number: 

  • R782

Table 1

Scanning parameter settings for ProMax 3D and DCT PRO CBCTs"

CBCT Scan protocol Voltage /kV Current /mA Exposure time /s Reconstruction time/s Voxel size /mm
ProMax 3D High 84 16 12 150 0.16
Normal 84 16 12 90 0.16
Low 84 8 2.8 60 0.32
DCT PRO NQ + NR 90 7 15 90 0.3
NQ + HR 90 7 15 120 0.3
HQ + NR 90 7 24 90 0.15
HQ + HR 90 7 24 120 0.15

Figure 1

Images reconstructed from ProMax 3D CBCT scanning with different resolution settings A, high resolution; B, normal resolution; C, low resolution."

Figure 2

ROC curves and Az value obtained from combined observer performance of ProMax 3D CBCT with different resolution settings"

Table 2

Az values from ProMax 3D CBCT scanning with different resolution settings for defects in different depths"

Depth/mm High Normal Low
0.1 0.793 0.589 0.562
0.2 0.914 0.762 0.695
0.3 0.919 0.798 0.776

Figure 3

Images reconstructed from DCT PRO CBCT scanning with different resolution settings A, normal quality+normal resolution; B, normal quality+high resolution; C, high quality+normal resolution; D, high quality+high resolution."

Figure 4

ROC curves and Az value obtained from combined observer performance of DCT PRO CBCT with different resolution settings"

Table 3

Az values from DCT PRO CBCT scanning with different resolution settings for defects in different depths"

Group Depth/mm
0.1 0.2 0.3
Normal quality + normal resolution 0.405 0.545 0.665
Normal quality + high resolution 0.539 0.82 0.846
High quality + normal resolution 0.646 0.761 0.846
High quality + high resolution 0.681 0.853 0.865
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