Clinical Application of Spectral CT in Cardiac Pacemaker Implantation
SHI Kang1, CHU Chen1, YANG Shangwen1, WANG Mingjun2, LI Ming1, HU Anning1, XIN Xiaoyan1
1. Department of Radiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School,
Nanjing Jiangsu 210008, China; 2. GE (China) CT Imaging Research Center, Shanghai 200210, China
Abstract：Objective To investigate the clinical application of metal artifacts reduction (MAR) combined with spectrum CT
monoenergetic imaging after cardiac pacemaker implantation. Methods A total of 44 patients with cardiac pacemaker implantation
who underwent energy spectrum CT examination in our hospital from February to May 2021 were selected. The original data were
used as the non-MAR group, and MAR reconstruction was used as MAR group. Images of the two groups with mixed energy and 70-
140 keV single energy were obtained by post-processing. At the level with the largest coverage area of metal artifacts, the pectoralis
major, pectoralis minor and the dorsal adipose tissue on the contralateral side in the areas of high and low density artifacts were divided into region of interest (ROI), and the CT value and standard deviation value were measured. Artifact index (AI) and contrast
to noise ratio (CNR) were calculated and analyzed by paired sample t test and one-way variance statistical. Two physicians scored
the images subjectively according to the image artifact,tissue contrast and comprehensive scores, and the consistency was evaluated
by Kappa test. Results The AI value and CNR value in the shadow area gradually decrease with the increase of keV. At the same
keV, the AI value and CNR value of MAR group was significantly lower than that of non-MAR group (P<0.05). The two physicians
had a good consistency (Kappa value of 0.873), and the 110 keV composite score was the highest. Conclusion High keV spectrum
CT monoenergetic imaging combined with MAR technique can effectively be used to remove metal artifacts after cardiac pacemaker
implantation during CT scanning and 100~120 keV is the best single energy range for observing soft tissue around pacemaker.
施康1，储晨1，杨尚文1，王铭君2，李茗1，胡安宁1，辛小燕1. 能谱CT在心脏起搏器植入术后的临床应用研究[J]. 中国医疗设备, 2022, 37(8): 104-107.
SHI Kang1, CHU Chen1, YANG Shangwen1, WANG Mingjun2, LI Ming1, HU Anning1, XIN Xiaoyan1. Clinical Application of Spectral CT in Cardiac Pacemaker Implantation. China Medical Devices, 2022, 37(8): 104-107.
