TY - JOUR
T1 - Image quality optimization using a narrow vertical detector dental cone-beam CT
AU - Brasil, Danieli Moura
AU - Pauwels, Ruben
AU - Coucke, Wim
AU - Haiter-Neto, Francisco
AU - Jacobs, Reinhilde
N1 - Funding Information:
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. We also thank the observers Jardel Mazzi-Chaves, Danilo Schneider, Daniel Vasconcelos for making possible to obtain the clinical results of this study.
Publisher Copyright:
© 2019 The Authors.
PY - 2019
Y1 - 2019
N2 - Objectives: To determine the optimized kV setting for a narrow detector cone-beam CT (CBCT) unit. Methods: Clinical (CL) and quantitative (QUANT) evaluations of image quality were performed using an anthropomorphic phantom. Technical (TECH) evaluation was performed with a polymethyl methacrylate phantom. Images were obtained using a PaX-i3D Green CBCT (Vatech, Hwaseong, Korea) device, with a large 21 × 19 and a medium 12 × 9 cm field of view (FOV), and high-dose (HD–ranging from 85 to 110 kV) and low-dose (LD–ranging from 75 to 95 kV) protocols, totaling four groups (21 × 19 cm HD, 21 × 19 cm LD, 12 × 9 cm HD, 12 × 9 cm LD). The radiation dose within each group was fixed by adapting the mA according to a predetermined dose-area product. For CL evaluation, three observers assessed images based on overall quality, sharpness, contrast, artefacts, and noise. For QUANT evaluation, mean gray value shift, % increase of standard deviation (SD), % of beam hardening and contrast-to-noise ratio (CNR) were calculated. For TECH evaluation, segmentation accuracy, CNR, metal artefact SD, metal object area, and sharpness were measured. Representative parameters were chosen for CL, QUANT, and TECH evaluations to determine the optimal kV based on biplot graphs. kV values of the same protocol were compared by the bootstrapping approach. The ones that had statistical differences with the best kV were considered as worse quality. Results: Overall, kV values within the same group showed similar quality (p > 0.05), except for 110 kV in 21 × 19 cm HD and 85 kV in 12 × 9 cm HD of CL score; also 85, 90 kV in 21 × 19 cm HD and 75, 80 kV in 21 × 19 cm LD of QUANT score which were worse (p < 0.05). conclusion: At a constant dose, low and high kV protocols yield acceptable image quality for a narrow-detector CBCT unit.
AB - Objectives: To determine the optimized kV setting for a narrow detector cone-beam CT (CBCT) unit. Methods: Clinical (CL) and quantitative (QUANT) evaluations of image quality were performed using an anthropomorphic phantom. Technical (TECH) evaluation was performed with a polymethyl methacrylate phantom. Images were obtained using a PaX-i3D Green CBCT (Vatech, Hwaseong, Korea) device, with a large 21 × 19 and a medium 12 × 9 cm field of view (FOV), and high-dose (HD–ranging from 85 to 110 kV) and low-dose (LD–ranging from 75 to 95 kV) protocols, totaling four groups (21 × 19 cm HD, 21 × 19 cm LD, 12 × 9 cm HD, 12 × 9 cm LD). The radiation dose within each group was fixed by adapting the mA according to a predetermined dose-area product. For CL evaluation, three observers assessed images based on overall quality, sharpness, contrast, artefacts, and noise. For QUANT evaluation, mean gray value shift, % increase of standard deviation (SD), % of beam hardening and contrast-to-noise ratio (CNR) were calculated. For TECH evaluation, segmentation accuracy, CNR, metal artefact SD, metal object area, and sharpness were measured. Representative parameters were chosen for CL, QUANT, and TECH evaluations to determine the optimal kV based on biplot graphs. kV values of the same protocol were compared by the bootstrapping approach. The ones that had statistical differences with the best kV were considered as worse quality. Results: Overall, kV values within the same group showed similar quality (p > 0.05), except for 110 kV in 21 × 19 cm HD and 85 kV in 12 × 9 cm HD of CL score; also 85, 90 kV in 21 × 19 cm HD and 75, 80 kV in 21 × 19 cm LD of QUANT score which were worse (p < 0.05). conclusion: At a constant dose, low and high kV protocols yield acceptable image quality for a narrow-detector CBCT unit.
KW - Computed-assisted image analysis
KW - Cone-beam CT
KW - Image quality
KW - Imaging
KW - Optimization
KW - Phantoms
UR - http://www.scopus.com/inward/record.url?scp=85062107683&partnerID=8YFLogxK
U2 - 10.1259/dmfr.20180357
DO - 10.1259/dmfr.20180357
M3 - Journal article
C2 - 30604636
AN - SCOPUS:85062107683
SN - 0250-832X
VL - 48
JO - Dentomaxillofacial Radiology
JF - Dentomaxillofacial Radiology
IS - 3
M1 - 20180357
ER -