Variability of dental cone beam CT grey values for density estimations

被引：107

作者：

Pauwels, R. ^{[1
]}

Nackaerts, O. ^{[1
]}

Bellaiche, N. ^{[2
]}

Stamatakis, H. ^{[3
]}

Tsiklakis, K. ^{[3
]}

Walker, A. ^{[4
]}

Bosmans, H. ^{[5
]}

Bogaerts, R. ^{[6
]}

Jacobs, R. ^{[1
]}

Horner, K. ^{[7
]}

机构：

[1] Univ Louvain, Oral Imaging Ctr, Dept Oral Hlth Sci, Biomed Sci Grp, B-3000 Louvain, Belgium

[2] Ctr Radiol St Germain, Paris, France

[3] Univ Athens, Dept Oral Diag & Oral Radiol, Sch Dent, Athens, Greece

[4] Leeds Test Objects Ltd, Boroughbridge, England

[5] Katholieke Univ Leuven Hosp, Dept Radiol, B-3000 Louvain, Belgium

[6] Katholieke Univ Leuven Hosp, Dept Expt Radiotherapy, Louvain, Belgium

[7] Univ Manchester, Sch Dent, Manchester Acad Hlth Sci Ctr, Manchester, Lancs, England

来源：

BRITISH JOURNAL OF RADIOLOGY | 2013年 / 86卷 / 1021期

关键词：

COMPUTED-TOMOGRAPHY; BONE-DENSITY; MORPHOMETRIC-ANALYSIS; PERIAPICAL LESIONS; IMPLANT PLACEMENT; QUALITY; RADIOGRAPHY; ARTIFACTS; ACCURACY; MAXILLA;

D O I：

10.1259/bjr.20120135

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Objective: The aim of this study was to investigate the use of dental cone beam CT (CBCT) grey values for density estimations by calculating the correlation with multislice CT (MSCT) values and the grey value error after recalibration. Methods: A polymethyl methacrylate (PMMA) phantom was developed containing inserts of different density: air, PMMA, hydroxyapatite (HA) 50 mg cm(-3), HA 100, HA 200 and aluminium. The phantom was scanned on 13 CBCT devices and 1 MSCT device. Correlation between CBCT grey values and CT numbers was calculated, and the average error of the CBCT values was estimated in the medium-density range after recalibration. Results: Pearson correlation coefficients ranged between 0.7014 and 0.9996 in the full-density range and between 0.5620 and 0.9991 in the medium-density range. The average error of CBCT voxel values in the medium-density range was between 35 and 1562. Conclusion: Even though most CBCT devices showed a good overall correlation with CT numbers, large errors can be seen when using the grey values in a quantitative way. Although it could be possible to obtain pseudo-Hounsfield units from certain CBCTs, alternative methods of assessing bone tissue should be further investigated. Advances in knowledge: The suitability of dental CBCT for density estimations was assessed, involving a large number of devices and protocols. The possibility for grey value calibration was thoroughly investigated.

引用

页数：9

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