Optimization of exposure parameters and relationship between subjective and technical image quality in cone-beam computed tomography
박하나, 민창기, 김경아, 고광준,
소속 상세정보
박하나 ( Park Ha-Na ) - Chonbuk National University School of Dentistry Department of Oral and Maxillofacial Radiology
민창기 ( Min Chang-Ki ) - Chonbuk National University School of Dentistry Department of Oral and Maxillofacial Radiology
김경아 ( Kim Kyoung-A ) - Chonbuk National University School of Dentistry Department of Oral and Maxillofacial Radiology
고광준 ( Koh Kwang-Joon ) - Chonbuk National University School of Dentistry Department of Oral and Maxillofacial Radiology
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 and Methods: 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.
키워드
Optimization; Image Quality; Cone-Beam Computed Tomography
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