不同扫描体位和定位像方向对单髋关节CT图像及辐射剂量影响

doi:10.7517/issn.1674-0475.231006

影像科学与光化学 ›› 2024, Vol. 42 ›› Issue (1): 23-28.DOI: 10.7517/issn.1674-0475.231006

不同扫描体位和定位像方向对单髋关节CT图像及辐射剂量影响

蒋栋栋¹, 王亚囡², 周蕾¹, 孙澳¹, 吕国义¹

1. 武汉市第四医院放射科, 湖北武汉 430033;
2. 华中科技大学同济医学院附属武汉儿童医院影像中心, 湖北武汉 430017

收稿日期:2023-10-11 修回日期:2023-12-11 发布日期:2024-02-21
通讯作者: 吕国义

Effects of Different Scanning Position and Scout Orientation on CT Images and Radiation Dose of Unilateral Hip

JIANG Dongdong¹, WANG Ya’nan², ZHOU Lei¹, SUN Ao¹, LV Guoyi¹

1. Department of Radiology, Wuhan Fourth Hospital, Wuhan 430033, Hubei, P.R. China;
2. Imaging Center, Wuhan Children's Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430017, Hubei, P.R. China

Received:2023-10-11 Revised:2023-12-11 Published:2024-02-21

摘要/Abstract

摘要： 在自动管电流调制(ATCM)技术下,探讨不同扫描体位及定位像方向在单髋关节CT中对图像和辐射剂量的影响。将120例进行单髋关节CT检查患者随机分为4组。A组常规扫描以身体正中线作矢状垂直定位线,定位像前后位+左侧位,扫描视野选择大体型,其余三组以患侧髋关节为中心的等中心扫描,扫描视野均选择小体型,其中B组定位像采用前后位+X线管靠近身体长轴的侧位像;C组采用前后位+X线管远离身体长轴的侧位像;D组仅采用前后位。比较4组患者的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP),同时测量并计算图像客观噪声、信噪比(SNR)、对比信噪比(CNR),评估图像主观噪声、条纹伪影及诊断信心度。结果显示4组间客观噪声、SNR、CNR、CTDIvol、DLP的差异具有统计学意义(P＜0.01),组间比较显示,C与D组各项的差异无统计学意义(均P＞0.05),其余组间比较各项的差异具有统计学意义(P＜0.01),C、D组辐射剂量整体降低16%~35%;4组图像在主观噪声、条纹伪影及诊断信心度上的差异无统计学意义(P＞0.05)。在基于最后一次采集定位像信息的ATCM系统中进行单髋关节CT扫描时,推荐等中心扫描方案同时选择小体型扫描视野,将前后定位像或选择X线管远离身体长轴的侧位定位像作为最后一次执行计划,能保证图像质量同时进一步优化辐射剂量。

关键词: 髋关节, 定位像, 等中心扫描, 自动管电流调制技术, 辐射剂量

Abstract: To investigate the effect of different scanning positions and scout orientation on image quality and radiation dose in CT scanning of unilateral hip with automatic tube current modulation (ATCM). 120 patients who underwent CT examination of single hip were randomly divided into 4 groups. In group A, the body midline was used as the sagittal vertical orientation line, a scout image was anteroposterior + left side, and the scanning field of view was large body type. In the other three groups, the hip was 23taken as the center of the isocenter scanning, and the scanning field of view was small body type. In group B, the orientation of the scout image was anteroposterior + lateral image of the X-ray tube close to the long axis of the body. The orientation of group C was anteroposterior + lateral image of the X-ray tube away from the long axis of the body. Only anteroposterior direction is used for group D scout image. The volume CT dose index (CTDIvol), dose length product (DLP), objective noise, signal-to-noise ratio (SNR) and contrast signal-to-noise ratio (CNR) were measured and calculated. Three subjective measures (Subjective noise, streak artifacts and diagnostic confidence) were evaluated. The objective noise, SNR, CNR, CTDIvol and DLP were significantly different among the four groups (P<0.01). There was no significant difference between group C and group D (P>0.05), The overall radiation dose of group C and D was reduced by 16%-35% compared with other groups. There was no significant difference in all subjective indexes among the four groups (P>0.05). In the case of unilateral hip CT scan in the ATCM system based on the information of the last scout view, it is recommended to select the small body scanning field of view in the isocenter scanning scheme, and select the anteroposterior scout image or the lateral scout image of the X-ray tube away from the long axis of the body as the last execution plan, which can ensure the image quality and further optimize the radiation dose.

Key words: hip, scout image, isocenter scanning, automatic tube current modulation technique, radiation dose

蒋栋栋, 王亚囡, 周蕾, 孙澳, 吕国义. 不同扫描体位和定位像方向对单髋关节CT图像及辐射剂量影响[J]. 影像科学与光化学, 2024, 42(1): 23-28.

JIANG Dongdong, WANG Ya’nan, ZHOU Lei, SUN Ao, LV Guoyi. Effects of Different Scanning Position and Scout Orientation on CT Images and Radiation Dose of Unilateral Hip[J]. IMAGING SCIENCE AND PHOTOCHEMISTRY, 2024, 42(1): 23-28.

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不同扫描体位和定位像方向对单髋关节CT图像及辐射剂量影响

Effects of Different Scanning Position and Scout Orientation on CT Images and Radiation Dose of Unilateral Hip

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