李子元 1毕忠旭 1李玮 1刘佳 1赵凯 1邱建星1
作者信息
- 1. 北京大学第一医院医学影像科,北京 100034
- 折叠
摘要
Abstract
Objective To compare the image quality of non-contrast MR pulmonary angiography(MRPA)with two different voxel sizes.Methods This study consisted of 29 healthy volunteers recruited in our hospital from Sptember to October 2020 who underwent non-contrast MRPA with the following two sequences of different parameters:Group 1:voxel size=1.2 mm×1.2 mm×4 mm,group 2:voxel size=2 mm×2 mm×2 mm.The subjective image quality assessment of normal pulmonary arteries was evaluated by two experienced radiologists on primary coronal images and constructed axial images separately and image quality of these two groups was compared.Results The mean image quality scores of the main,left,and right pulmonary arterial trunks on primary coronal images were 3(3,3),3(3,3),3(3,4)(group 1)and 2(2,3),2(2,3),2(3,3)(group 2).The mean image quality scores of the main,left,and right pulmonary arterial trunks on constructed axial images were 2(2,3),1(1,2),1(2,2)(group 1)and 1.5(2,2),2(2,3),2(2,3)(group 2).Branch subjective image quality of group 1 was better than group 2 on primary coronal images(P<0.05),however,there was no statistical difference between these two groups in signal noise ratio(SNR)and contrast noise ratio(CNR,P>0.05).Meanwhile,the subjective image quality of the left and right pulmonary artery trunk in group 2 was better than group 1 on constructed axial images(P<0.05),in contrast,SNR and CNR of all pulmonary artery branches evaluated in group 1 was better than group 2 on constructed axial images(P<0.05).Otherwise,SNR and CNR of all pulmonary artery branches evaluated on coronal images were better than constructed axial images(P<0.05).Conclusion Non-contrast MRPA images with higher resolution within a coronal plane with voxel size 1.2 mm×1.2 mm×4 mm can provide better primary coronal images but images with isotropy with voxel size 2 mm×2 mm×2 mm can acquire better subjective image quality on constructed axial images.关键词
磁共振成像/肺动脉血管成像/肺栓塞/体素Key words
MRI/pulmonary artery angiography/pulmonary embolism/voxel size
