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Subjective and Objective Assessment of Monoenergetic and Polyenergetic Images Acquired by Dual-Energy CT in Breast Cancer

Korean Journal of Radiology 2021년 22권 4호 p.502 ~ 512
Wang Xiaoxia, Liu Daihong, Jiang Shixi, Zeng Xiangfei, Li Lan, Yu Tao, Zhang Jiuquan,
소속 상세정보
 ( Wang Xiaoxia ) - Chongqing University Cancer Hospital Department of Radiology
 ( Liu Daihong ) - Chongqing University Cancer Hospital Department of Radiology
 ( Jiang Shixi ) - Chongqing University Cancer Hospital Department of Radiology
 ( Zeng Xiangfei ) - Chongqing University Cancer Hospital Department of Radiology
 ( Li Lan ) - Chongqing University Cancer Hospital Department of Radiology
 ( Yu Tao ) - Chongqing University Cancer Hospital Department of Radiology
 ( Zhang Jiuquan ) - Chongqing University Cancer Hospital Department of Radiology

Abstract


Objective: To objectively and subjectively assess and compare the characteristics of monoenergetic images [MEI (+)] and polyenergetic images (PEI) acquired by dual-energy CT (DECT) of patients with breast cancer.

Materials and Methods: This retrospective study evaluated the images and data of 42 patients with breast cancer who had undergone dual-phase contrast-enhanced DECT from June to September 2019. One standard PEI, five MEI (+) in 10-kiloelectron volt (keV) intervals (range, 40?80 keV), iodine density (ID) maps, iodine overlay images, and Z effective (Zeff) maps were reconstructed. The contrast-to-noise ratio (CNR) and the signal-to-noise ratio (SNR) were calculated. Multiple quantitative parameters of the malignant breast lesions were compared between the arterial and the venous phase images. Two readers independently assessed lesion conspicuity and performed a morphology analysis.

Results: Low keV MEI (+) at 40?50 keV showed increased CNR and SNRbreast lesion compared with PEI, especially in the venous phase ([CNR: 40 keV, 20.10; 50 keV, 14.45; vs. PEI, 7.27; p < 0.001], [SNRbreast lesion: 40 keV, 21.01; 50 keV, 16.28; vs. PEI, 10.77; p < 0.001]). Multiple quantitative DECT parameters of malignant breast lesions were higher in the venous phase images than in the arterial phase images (p < 0.001). MEI (+) at 40 keV, ID, and Zeff reconstructions yielded the highest Likert scores for lesion conspicuity. The conspicuity of the mass margin and the visual enhancement were significantly better in 40-keV MEI (+) than in the PEI (p = 0.022, p = 0.033, respectively).

Conclusion: Compared with PEI, MEI (+) reconstructions at low keV in the venous phase acquired by DECT improved the objective and subjective assessment of lesion conspicuity in patients with malignant breast lesions. MEI (+) reconstruction acquired by DECT may be helpful for the preoperative evaluation of breast cancer.

키워드

Dual-energy computed tomography; Monoenergetic images; Polyenergetic images; Breast cancer; Quantitative parameters

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