Research on the impact of different reconstruction algorithms and low-dose scanning based on head phantom on the CT imaging quality of inner ear
10.3969/j.issn.1672-8270.2024.06.004
- VernacularTitle:基于头颅模体的不同重建算法及低剂量扫描对内耳CT成像质量的影响研究
- Author:
Xiaoqing WANG
1
;
Rong JIANG
;
Siyuan LIN
;
Ning WANG
Author Information
1. 首都医科大学附属北京友谊医院放射科 北京 102600
- Keywords:
Inner ear computed tomography;
Radiation exposure;
Reconstruction algorithm;
Low dose
- From:
China Medical Equipment
2024;21(6):18-24
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the impact factors of computed tomography(CT)imaging quality of inner ear under different reconstruction algorithms,and to explore the feasibility and application value that different reconstruction algorithms reduced the CT scanning dose for inner ear.Methods:Based on the head phantom,fixed tube currents of 100,80,70,60,50,and 40 mA were respectively used to perform high-resolution CT(HRCT)of multi-slice spiral volume at transverse section.Each tube current was used to conduct 25 example number of scanning experiments.Different reconstruction parameters were used to reconstruct images by using three commonly reconstruction techniques for inner ear CT,which included volume rendering technique(VRT),multiple planar reconstruction(MPR)and maximum intensity projection(MIP).The effects of different tube currents and reconstruction parameters on the quality scores of soft tissue,bone,and artifacts in VRT,MPR and MIP images were analyzed and compared.Four physicians used a blind method to score the image quality as a scale of 0-3.Results:Under the same tube current,the quality scores of soft tissue,bone and artifact of VRT,MPR and MIP images gradually decreased with the increasing of reconstruction interval,and the differences were statistically significant(F=61.853,49.296,71.280,P<0.05),respectively.Under the parameters of same reconstruction interval,the quality scores of soft tissue,bone and artifact of VRT,MPR and MIP images gradually decreased with the decreasing of tube current during scanning,and the differences were statistically significant(F=16.346,23.632,21.746,P<0.05),respectively.The quality scores of soft tissue,bone and artifacts of images were positively correlated with tube current(r=0.892,0.907,0.871,P<0.05),and were negatively correlated with reconstruction interval(r=-0.841,-0.864,-0.866,P<0.05),respectively.Conclusion:In CT scanning of inner ear,the decrease of reconstruction interval can effectively improve the imaging qualities of thin-layer and low-dose scans,and further reduce the CT radiation dose of inner ear,which has clinical feasibility and application value.
