Reduction of metal artifacts from knee tumor prostheses on CT images: value of the single energy metal artifact reduction (SEMAR) algorithm

BMC Cancer

Fang-ling Zhang¹  Zhao-hui Zhang¹  Ruo-cheng Li¹  Ling Ma¹  Lei Ding¹  Xiao-ling Zhang¹ 

[1] Department of Radiology, The First Affiliated Hospital, Sun Yat-sen University, 58# Zhongshan Er Road, 510080, Guangzhou, Guangdong Province, People’s Republic of China;

关键词: Metal artifact reduction;    Tumor prosthesis;    Knee;    Computed tomography;    Image quality;   

DOI  :  10.1186/s12885-021-09029-3

来源: Springer

【 摘 要 】

BackgroundTo evaluate the effect of the single energy metal artifact reduction (SEMAR) algorithm with a multidetector CT (MDCT) for knee tumor prostheses.MethodsFirst, a phantom of knee tumor prosthesis underwent a MDCT scan. The raw data was reconstructed by iterative reconstruction (IR) alone and IR plus SEMAR. The mean value of the CT number and the image noise were measured around the prosthesis at the stem level and articular level. Second, 95 consecutive patients with knee tumor prostheses underwent MDCT scans. The raw data were also reconstructed by the two methods. Periprosthetic structures were selected at the similar two levels. Four radiologists visually graded the image quality on a scale from 0 to 5. Additionally, the readers also assessed the presence of prosthetic complication and tumor recurrence on a same scale.ResultsIn the phantom, when the SEMAR was used, the CT numbers were closer to normal value and the noise of images using soft and sharper kernel were respectively reduced by up to 77.1% and 43.4% at the stem level, and by up to 82.2% and 64.5% at the articular level. The subjective scores increased 1 ~ 3 points and 1 ~ 4 points at the two levels, respectively. Prosthetic complications and tumor recurrence were diagnosed in 66 patients. And the SEMAR increased the diagnostic confidence of prosthetic complications and tumor recurrence (4 ~ 5 vs. 1 ~ 1.5).ConclusionsThe SEMAR algorithm can significantly reduce the metal artifacts and increase diagnostic confidence of prosthetic complications and tumor recurrence in patients with knee tumor prostheses.

【 授权许可】

CC BY