Goh Yin P, Lau Kenneth K, Low Keat, Buchan Kevin, Oh Lawrence Chia Wei, Kuganesan Ahilan, Huynh Minh
Diagnostic Imaging Department, Monash Health, 246, Clayton Road, Clayton, 3168, Victoria, Australia.
Department of Medicine, Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria, Australia.
Eur Radiol. 2016 Dec;26(12):4545-4550. doi: 10.1007/s00330-016-4313-7. Epub 2016 Mar 14.
To compare the image quality between fine focal spot size (FFSS) and standard focal spot size (SFSS) in computed tomography of the abdomen and pelvis (CTAP) METHODS: This retrospective review included all consecutive adult patients undergoing contrast-enhanced CTAP between June and September 2014. Two blinded radiologists assessed the margin clarity of the abdominal viscera and the detected lesions using a five-point grading scale. Cohen's kappa test was used to examine the inter-observer reliability between the two reviewers for organ margin clarity. Mann-Whitney U testing was utilised to assess the statistical difference of the organ and lesion margin clarity.
100 consecutive CTAPs were recruited. 52 CTAPs were examined with SFSS of 1.1 × 1.2 mm and 48 CTAPs were examined with FFSS of 0.6 × 0.7 mm. Results showed that there was substantial agreement for organ margin clarity (mean κ = 0.759, p < 0.001) among the reviewers. FFSS produces images with clearer organ margins (U = 76194.0, p < 0.001, r = 0.523) and clearer lesion margins (U = 239, p = 0.052, r = 0.269).
FFSS CTAP improves image quality in terms of better organ and lesion margin clarity. Fine focus CT scanning is a novel technique that may be applied in routine CTAP imaging.
• Fine focal spot improves organ margin clarity. • Fine focal spot improves lesion margin clarity. • Fine focal spot can be used in routine CT abdominal imaging.
比较腹部和盆腔计算机断层扫描（CTAP）中细焦点尺寸（FFSS）与标准焦点尺寸（SFSS）下的图像质量。方法：这项回顾性研究纳入了2014年6月至9月间所有连续接受对比增强CTAP的成年患者。两名盲法放射科医生使用五点分级量表评估腹部脏器和检测到的病变的边缘清晰度。采用Cohen's kappa检验来检验两位阅片者之间在器官边缘清晰度方面的观察者间可靠性。使用Mann-Whitney U检验评估器官和病变边缘清晰度的统计学差异。
共纳入100例连续的CTAP检查。52例CTAP检查采用1.1×1.2 mm的SFSS，48例CTAP检查采用0.6×0.7 mm的FFSS。结果显示，阅片者之间在器官边缘清晰度方面有高度一致性（平均κ = 0.759，p < 0.001）。FFSS产生的图像具有更清晰的器官边缘（U = 76194.0，p < 0.001，r = 0.523）和更清晰的病变边缘（U = 239，p = 0.052，r = 0.269）。
FFSS CTAP在改善器官和病变边缘清晰度方面提高了图像质量。细焦点CT扫描是一种可应用于常规CTAP成像的新技术。
• 细焦点提高器官边缘清晰度。• 细焦点提高病变边缘清晰度。• 细焦点可用于常规腹部CT成像。
