Kapur Savinay, Jana Manisha, Gupta Lalit, Bhalla Ashu S, Naranje Priyanka, Gupta Arun K
Department of Radiodiagnosis, All India Institute of Medical Sciences, New Delhi 110029, India.
Department of Radiodiagnosis, All India Institute of Medical Sciences, New Delhi 110029, India.
Curr Probl Diagn Radiol. 2021 Jan-Feb;50(1):41-47. doi: 10.1067/j.cpradiol.2019.07.009. Epub 2019 Jul 11.
To compare image quality of free-breathing T2-weighted MultiVane-XD (MVXD) sequence (non-Cartesian k-space filling using radial rectangular blades) with conventional MR sequences (short tau inversion recovery [STIR],balanced true field echo [BTFE], T1 in phase fast field echo [T1 FFE], and T1-fat saturated postgadolinium [T1PG]) in MR imaging of chest.
Twenty-one patients (10 men and 11 women) underwent chest MRI including T2W MVXD, STIR, BTFE (18/21), T1 FFE, T1PG (10/21) sequences at 1.5 T. Two reviewers (A.S.B and M.J. with 20 and 10 years of experience in pulmonary imaging, respectively) evaluated each sequence with respect to overall image quality, image sharpness, definition of mediastinal vessels including the aorta, pulmonary arteries, superior vena cava, intrapulmonary vessels; trachea, main bronchi, intrapulmonary airways; lung-mediastinal interface, pulmonary lesion detection, and artefacts in the upper, middle, and lower third of chest using 5-point scales. No sedation was given. Pairwise comparisons between T2W MVXD and the 4 conventional sequences were made using unpaired student's t test.
Mean age of patients was 30.67 years (range: 6-60 years). T2 MVXD showed significantly better overall image quality and sharpness than STIR, T1 FFE, and T1PG (P < 0.01) while it was comparable to BTFE. Mediastinal vessels were significantly better visualized on T2 MVXD as compared to STIR and T1 (P < 0.003). However, BTFE and T1PG were superior to T2 MVXD for visualization of great vessels, SVC, and intrapulmonary vessels (P < 0.01). Visualization of trachea, major bronchi, intrapulmonary airways as well as intrapulmonary lesion detection was significantly better on T2 MVXD images in comparison to any of the other 4 sequences (P < 0.03). Intrapulmonary artifacts were significantly lesser in BTFE images as compared to T2 MVXD (P < 0.01). No significant difference was found between the severity of intrapulmonary artifacts in other MR sequences as compared to T2 MVXD.
By virtue of its better overall image quality, sharpness, superior visualization of mediastinal airways, and lesion detection, T2 MultiVane-XD promises to be a robust addition in the armamentarium of thoracic radiologists.
比较自由呼吸T2加权多叶片-XD（MVXD）序列（使用径向矩形叶片的非笛卡尔k空间填充）与传统MR序列（短tau反转恢复[STIR]、平衡真场回波[BTFE]、T1同相位快速场回波[T1 FFE]和T1脂肪饱和钆增强后[T1PG]）在胸部MR成像中的图像质量。
21例患者（10例男性和11例女性）在1.5T下接受胸部MRI检查，包括T2W MVXD、STIR、BTFE（18/21）、T1 FFE、T1PG（10/21）序列。两名阅片者（A.S.B和M.J.分别有20年和10年肺部成像经验）使用5分制对每个序列的整体图像质量、图像清晰度、纵隔血管（包括主动脉、肺动脉、上腔静脉、肺内血管）、气管、主支气管、肺内气道、肺-纵隔界面、肺部病变检测以及胸部上、中、下三分之一的伪影进行评估。未给予镇静剂。使用不成对学生t检验对T2W MVXD与4种传统序列进行两两比较。
患者的平均年龄为30.67岁（范围：6 - 60岁）。T2 MVXD显示出比STIR、T1 FFE和T1PG明显更好的整体图像质量和清晰度（P < 0.01），而与BTFE相当。与STIR和T1相比，T2 MVXD上纵隔血管的显示明显更好（P < 0.003）。然而，在显示大血管、上腔静脉和肺内血管方面，BTFE和T1PG优于T2 MVXD（P < 0.01）。与其他4种序列中的任何一种相比，T2 MVXD图像上气管、主支气管、肺内气道以及肺部病变检测的显示明显更好（P < 0.03）。与T2 MVXD相比，BTFE图像中的肺内伪影明显更少（P < 0.01）。与T2 MVXD相比，其他MR序列中肺内伪影的严重程度没有显著差异。
凭借其更好的整体图像质量、清晰度、纵隔气道的优越显示以及病变检测，T2多叶片-XD有望成为胸部放射科医生的有力工具。
