Optimization of exposure parameters and relationship between subjective and technical image quality in cone-beam computed tomography
Imaging Science in Dentistry
;
: 139-151, 2019.
Article
in English
| WPRIM
| ID: wpr-763991
ABSTRACT
PURPOSE:
This study was performed to investigate the effect of exposure parameters on image quality obtained using a cone-beam computed tomography (CBCT) scanner and the relationship between physical factors and clinical image quality depending on the diagnostic task. MATERIALS ANDMETHODS:
CBCT images of a SedentexCT IQ phantom and a real skull phantom were obtained under different combinations of tube voltage and tube current (Alphard 3030 CBCT scanner, 78–90 kVp and 2–8 mA). The images obtained using a SedentexCT IQ phantom were analyzed technically, and the physical factors of image noise, contrast resolution, spatial resolution, and metal artifacts were measured. The images obtained using a real skull phantom were evaluated for each diagnostic task by 6 oral and maxillofacial radiologists, and each setting was classified as acceptable or unacceptable based on those evaluations. A statistical analysis of the relationships of exposure parameters and physical factors with observer scores was conducted.RESULTS:
For periapical diagnosis and implant planning, the tube current of the acceptable images was significantly higher than that of the unacceptable images. Image noise, the contrast-to-noise ratio (CNR), the line pair chart on the Z axis, and modulation transfer function (MTF) values showed statistically significant differences between the acceptable and unacceptable image groups. The cut-off values obtained using receiver operating characteristic curves for CNR and MTF 10 were useful for determining acceptability.CONCLUSION:
Tube current had a major influence on clinical image quality. CNR and MTF 10 were useful physical factors that showed significantly associations with clinical image quality.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Skull
/
ROC Curve
/
Artifacts
/
Diagnosis
/
Cone-Beam Computed Tomography
/
Noise
Type of study:
Diagnostic study
/
Prognostic study
Language:
English
Journal:
Imaging Science in Dentistry
Year:
2019
Type:
Article
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