使用虚拟单色成像和骨科金属伪影减少技术对全髋关节置换术中金属伪影减少的定量分析：一项体模研究

Quantitative analysis of metal artifact reduction in total hip arthroplasty using virtual monochromatic imaging and orthopedic metal artifact reduction, a phantom study.

作者信息

Selles Mark, Stuivenberg Vera H, Wellenberg Ruud H H, van de Riet Loes, Nijholt Ingrid M, van Osch Jochen A C, van Hamersvelt Robbert W, Leiner Tim, Boomsma Martijn F

机构信息

Department of Radiology, Isala, 8025 AB, Zwolle, The Netherlands.

Department of Radiology, Amsterdam University Medical Centre, 1105 AZ, Amsterdam, The Netherlands.

出版信息

Insights Imaging. 2021 Nov 24;12(1):171. doi: 10.1186/s13244-021-01111-5.

OBJECTIVE

To quantify metal artifact reduction using 130 keV virtual monochromatic imaging (VMI) with and without orthopedic metal artifact reduction (O-MAR) in total hip arthroplasty.

METHODS

Conventional polychromatic images and 130 keV VMI of a phantom with pellets representing bone with unilateral or bilateral prostheses were reconstructed with and without O-MAR on a dual-layer CT. Pellets were categorized as unaffected, mildly affected and severely affected.

RESULTS

When 130 keV VMI with O-MAR was compared to conventional imaging with O-MAR, a relative metal artifact reduction in CT values, contrast-to-noise (CNR), signal-to-noise (SNR) and noise in mildly affected pellets (67%, 74%, 48%, 68%, respectively; p < 0.05) was observed but no significant relative metal artifact reduction in severely affected pellets. Comparison between 130 keV VMI without O-MAR and conventional imaging with O-MAR showed relative metal artifact reduction in CT values, CNR, SNR and noise in mildly affected pellets (92%, 72%, 38%, 51%, respectively; p < 0.05) but negative relative metal artifact reduction in CT values and noise in severely affected pellets (- 331% and -223%, respectively; p < 0.05), indicating aggravation of metal artifacts.

CONCLUSION

Overall, VMI of 130 keV with O-MAR provided the strongest metal artifact reduction.

目的

量化在全髋关节置换术中使用130 keV虚拟单色成像（VMI）并结合或不结合骨科金属伪影减少（O-MAR）技术时金属伪影的减少情况。

方法

在双层CT上，对带有代表骨骼的小球且有单侧或双侧假体的模型进行常规多色图像和130 keV VMI重建，重建时结合或不结合O-MAR。小球被分类为未受影响、轻度受影响和重度受影响。

结果

当将130 keV VMI结合O-MAR与结合O-MAR的传统成像进行比较时，观察到轻度受影响小球的CT值、对比噪声比（CNR）、信噪比（SNR）和噪声的相对金属伪影减少（分别为67%、74%、48%、68%；p<0.05），但重度受影响小球的相对金属伪影减少不显著。将不结合O-MAR的130 keV VMI与结合O-MAR的传统成像进行比较，结果显示轻度受影响小球的CT值、CNR、SNR和噪声有相对金属伪影减少（分别为92%、72%、38%、51%；p<0.05），但重度受影响小球的CT值和噪声有负的相对金属伪影减少（分别为-331%和-223%；p<0.05），表明金属伪影加重。