Experimental Study of Detectability of Simulated Lung Nodule on Computed Radiography System Using Various X-ray Beam Qualities

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  • Fujimoto Koya
    School of Health Sciences, Faculty of Medicine, The University of Tokushima Current address: Department of Radiological Technology, Yamaguchi University Hospital
  • Nishihara Sadamitsu
    Institute of Health Biosciences, The University of Tokushima Graduate School
  • Yagi Hirofumi
    Institute of Health Biosciences, The University of Tokushima Graduate School
  • Soga Akira
    School of Health Sciences, Faculty of Medicine, The University of Tokushima Current address: Bell Land General Hospital

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Other Title
  • 異なる線質で撮影したＣＲシステムにおける模擬肺結節陰影の検出能に関する実験的研究
  • 臨床技術 異なる線質で撮影したCRシステムにおける模擬肺結節陰影の検出能に関する実験的研究
  • リンショウ ギジュツ コトナル センシツ デ サツエイ シタ CR システム ニ オケル モギ ハイ ケッセツ インエイ ノ ケンシュツノウ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

The purpose of this study was to discuss the optimal X-ray beam quality for detection of simulated lung nodule on a computed radiography system. We set up four types of X-ray beam quality (90 kV, 120 kV, 150 kV, and 120 kV + gadolinium filter), and kept the incident dose on the patient at 0.3 mGy. A receiver operating characteristic (ROC) analysis and a granularity measurement were used to evaluate the relationship between the detection of a low-contrast object and X-ray beam quality. As a result, the areas under the ROC curve (AUC) of 90 kV and 120 kV + gadolinium filter were significantly superior to those of 120 kV and 150 kV (p<0.05). However, a significant difference was not observed between 90 kV and 120 kV + gadolinium filter, 120 kV and 150 kV. The order of the granularity values gave good agreement with the results of visual evaluation. In conclusion, we considered that the optimal X-ray beam quality was 90 kV or 120 kV + gadolinium filter.

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