Journal of Shandong University (Health Sciences) ›› 2018, Vol. 56 ›› Issue (12): 68-72.doi: 10.6040/j.issn.1671-7554.0.2018.722

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Effects of body mass index and renal subcutaneous depth on the results of virtual touch tissue imaging quantification in renal transplant patients

SHENG Xuan1, WANG Yonge1, GUO Dan1, LAN Meng1, FAN Fengjing2, DING Hongyu2   

  1. 1. Taishan Medical University, Taian 271000, Shandong, China;
    2. Department of Ultrasound, Qianfoshan Hospital Affiliated to Shandong University, Jinan 250014, Shandong, China
  • Published:2022-09-27

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Abstract: Objective Effects of the BMI and the subcutaneous depth of the transplanted kidney on results of virtual touch tissue imaging quantification(VTIQ)were studied by analyzing the quality control pattern images in VTIQ of patients with different somatotypes. Methods A total of 119 patients undergoing renal transplantation and postoperatively reexaminated as normal were selected from November 2017 to May 2018 in Qianfoshan Hospital Affiliated to Shandong University. Firstly, the height and weight of the patients were measured and the body mass index(BMI)value was calculated. Then the region of interest(ROI)was selected from the transplanted kidney cortex to measure the distance from the surface of the transplanted kidney to the body surface which was defined as a subcutaneous depth of the transplanted kidney. Finally, VTIQ was used to obtain the image in quality control mode and the images were divided into grades A, B and C according to the quality. Patients BMI and grades of images quality were recorded as BMI group, subcutaneous depths of transplanted kidneys and grades of images quality were recorded as Depth group, and the datas of two groups were statistically analyzed. Results The image quality of VTIQ quality control mode of transplanted kidney was different between the patients with different BMI and the different subcutaneous depth of the transplanted kidney(P<0.05). 山 东 大 学 学 报 (医 学 版)56卷12期 -盛璇,等.移植肾患者体质量指数与移植肾皮下深度对声触诊组织量化成像结果的影响 \=-ROC curves of two groups showed that AUC(BMI group)was greater than AUC(Depth group), the cut-off value between grades B and C was 23.99, the sensitivity was 0.800, and the specificity was 0.731. Conclusion The images quality of the VTIQ quality control model of transplanted kidney is related to the BMI and subcutaneous depth of the transplanted kidney. The greater the BMI or subcutaneous depth are, the worse the quality of the transplanted kidney quality control images is, that means the lower accuracy of the measured VTIQ results. Compared with the subcutaneous depth of transplanted kidney, the BMI of patient has a higher accuracy in the evalution of VTIQ results.

Key words: Kidney transplantation, Virtual touch tissue imaging quantification, Elastography, Quality control, Body mass index, Subcutaneous depth of the transplanted kidney

CLC Number: 

  • R445.1
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