Comparative study on image quality and radiation dose between the spiral scanning and the axial scanning for skull phantom based on specific conditions
10.3969/j.issn.1672-8270.2024.09.004
- VernacularTitle:基于特定条件下头颅模体螺旋扫描与轴位扫描的图像质量和辐射剂量的对比研究
- Author:
Zhiyuan GAO
1
;
Yan SUI
;
Kang LIU
;
Zhaorui CHEN
;
Shuangshuang ZHENG
;
Dewu YANG
Author Information
1. 首都医科大学附属复兴医院放射科 北京 100038
- Keywords:
Skull computed tomography(CT);
Spiral scanning;
Axial scanning;
Image quality;
Radiation dose
- From:
China Medical Equipment
2024;21(9):18-22
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore and compare the image quality and radiation dose between the spiral scanning and the axial scanning for skull phantom based on specific conditions.Methods:The position of the orbitomeatal base line(OBL)of the skull phantom was marked,and the different angles of elevation of skull were adjusted.The angles between OBL and bed surface were respectively set as 90°,100°,110° and 120°.The axial scanning and spiral scanning were respective adopted to conduct 24 times of image acquisition when the computed tomography dose index(CTDIvol)of fixed volume were respectively 40,50 and 60 mGy.The cross section of axial scanning was vertical to OBL,and the images of spiral scanning used the reconstructed technique of image quality enhancement(IQE)of removing spiral artifacts to conduct reconstruction along the OBL direction.The CT value(HU)and standard deviation(SD)of the bilateral cerebellum,temporal lobe,frontal lobe and parietal lobe of the phantom were measured,and the signal-to-noise ratio(SNR)of each lobe of the phantom was calculated.The CTDIvol and dose-length product(DLP)were recorded,and the effective dose(ED)of lens was calculated.Results:The differences of the SNR values of cerebellum and occipital lobe(R),cerebellum and occipital lobe(L),temporal lobe(R),temporal lobe(L),frontal lobe(R),frontal lobe(L),parietal lobe(R)and parietal lobe(L)between two kinds of scanning models were significant(F=6.48,5.83,7.00,6.20,7.30,8.26,5.72,5.83,P<0.05),respectively.There was significant difference in lens DLP between the two kinds of scanning models(F=10.96,P<0.05).The spiral scanning and IQE reconstructed technique were used to conduct image acquisition and processing.The SNR value of spiral scanning imaging was better than that of axial scanning,and the reconstructions of coronal and sagittal positions could be conducted,and the radiation doses of lens were similar,but the DLP value of spiral scanning was slightly higher than that of axial scanning at the same CTDIvol.Conclusion:Using the IQE reconstruction technique of spiral scanning can obtain satisfactory CT sectional images of skull under the situations that machine cannot change scanning angle or the scanning of axial position is unable to conduct cooperation.
