目的探讨肺部恶性肿瘤微波消融（MWA）术后即刻磁共振成像（MRI）的成像表现及参数分析。我们回顾性分析了34例肺部恶性肿瘤微波消融术后即刻的MRI表现。测量肺部恶性肿瘤的消融区参数，包括平扫CT（CT）、T1加权成像（T1WI）和T2-消融区的长径（L）、短径（S）和安全裕度。 MWA 后加权成像 (T2WI)。研究计算了肿瘤体积（V0）、消融区体积（V1）以及V0与V1的比率（V%）。分析各参数之间的统计学差异。病灶消融区域T2WI呈中心低信号、周边高信号，T1WI呈中心高信号、周边等高信号，周边呈环向强化。 T2WI 测量的安全裕度大于平扫 CT 和 T1WI 测量的安全裕度。 CT平片显示治疗有效组L、S、V1均小于治疗无效组（P<0.05）。在 T1WI 上，有效治疗组的 V% 和安全裕度大于无效治疗组（分别为 P=0.009 和 P=0.016）。MRI 可能是评估肺 MWA 后即刻疗效的一种新的、有价值的方法使用 T1WI 上的消融区域参数 V% 和 T2WI 上的安全裕度来评估恶性肿瘤。版权所有 © 2024 作者。由 Wolters Kluwer Health, Inc. 出版

To investigate the imaging performance and parametric analysis of magnetic resonance imaging (MRI) immediately after microwave ablation (MWA) of lung malignancies.We retrospectively analyzed the MRI performance immediately after MWA of 34 cases of lung malignancies. The ablation zone parameters of lung malignancies were measured, including the long diameter (L), short diameter (S), and safety margin of the ablation zone on plain computed tomography (CT), T1-weighted imaging (T1WI), and T2-weighted imaging (T2WI) after MWA. The study calculated the tumor volume (V0), the ablation zone volume (V1), and the ratio of V0 to V1 (V%). Statistical differences between the parameters were analyzed.The ablation area of the lesion exhibited central low signal and peripheral high signal on T2WI, central high signal and peripheral equal or high signal on T1WI, and circumferential enhancement in the periphery. The safety margin measured on T2WI was greater than that measured on plain CT and T1WI. On plain CT, the L, S, and V1 were smaller in the effective treatment group than in the ineffective treatment group (P<0.05). On T1WI, the V% and safety margin were greater in the effective treatment group than in the ineffective treatment group (P=0.009 and P=0.016, respectively).MRI may be a new, valuable method to assess immediate efficacy after MWA for lung malignancies using the ablation zone parameters V% on T1WI and safety margin on T2WI.Copyright © 2024 The Author(s). Published by Wolters Kluwer Health, Inc.