Breit H-C, Obmann M, Schlicht F, Vosshenrich J, Segeroth M, Bach M, Clauss M, Harder D, Donners R
Department of Radiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland.
Department of Radiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland.
Clin Radiol. 2025 Feb;81:106758. doi: 10.1016/j.crad.2024.106758. Epub 2024 Nov 30.
To quantitatively and qualitatively compare the magnitude of metal total hip arthroplasty-induced imaging artifacts in vivo between 1.5T and 0.55T MRI.
15 patients (69 ± 14 years) with THA, prospectively underwent 0.55T and 1.5T MRI of the hip. Two fellowship-trained musculoskeletal radiologists qualitatively rated artifact magnitude on T1-weighted and fluid-sensitive sequences using a 5-point Likert scale (0 = severe - 5 = no artifact). Quantitative artifact magnitude was assessed by a third fellowship-trained musculoskeletal radiologist, by measuring the maximum diameter of the THA-induced signal void (mm) anteroposteriorly d(ap) and mediolaterally d(ml) at the level of the acetabulum, proximal, mid and distal stem, including the prosthesis. Additionally, the area of signal void was noted (mm). Statistical differences between Likert scores were evaluated using the t-test or the Wilcoxon signed-rank test (P-values <.05 = significant).
Qualitative artifact magnitude was on average rated as moderate to small on 0.55T and as large to moderate on 1.5T by both readers. Artifacts were rated less severe on 0.55T compared with 1.5T on T1-weighted (3.7 ± 0.7 vs. 2.4 ± 1.1, p=0.004) and fluid-sensitive sequences (3.1 ± 0.5 vs. 2.2 ± 1.1, p=0.18). Overall image quality did not show any statistically significant differences between 0.55T and 1.5T MRI (each p≥0.18). Metal artifacts' areas and diameters were smaller on 0.55T when compared with 1.5T MRI for all sequences (each p>0.016).
Total hip arthroplasty-induced metal artifacts are perceived as less severe at new-generation 0.55T when compared with conventional 1.5T MRI with no difference in overall image quality.
定量和定性比较1.5T和0.55T MRI在体内金属全髋关节置换术引起的成像伪影大小。
15例（69±14岁）接受全髋关节置换术的患者前瞻性地接受了髋关节的0.55T和1.5T MRI检查。两名接受过专科培训的肌肉骨骼放射科医生使用5点李克特量表（0 = 严重 - 5 = 无伪影）对T1加权和液体敏感序列上的伪影大小进行定性评级。由第三位接受过专科培训的肌肉骨骼放射科医生通过测量髋臼、假体近端、中段和远端水平处全髋关节置换术引起的信号空洞的最大前后径d(ap)和内外径d(ml)（mm）来评估定量伪影大小。此外，记录信号空洞的面积（mm）。使用t检验或Wilcoxon符号秩检验评估李克特评分之间的统计学差异（P值<0.05 = 显著）。
两位读者对0.55T的定性伪影大小平均评定为中度至轻度，对1.5T的评定为重度至中度。在T1加权序列（3.7±0.7 vs. 2.4±1.1，p = 0.004）和液体敏感序列上，与1.5T相比，0.55T上的伪影评级较轻（3.1±0.5 vs. 2.2±1.1，p = 0.18）。总体图像质量在0.55T和1.5T MRI之间未显示任何统计学显著差异（各p≥0.18）。与1.5T MRI相比，0.55T上所有序列的金属伪影面积和直径均较小（各p>0.016）。
与传统1.5T MRI相比，新一代0.55T时全髋关节置换术引起的金属伪影被认为不那么严重，总体图像质量无差异。
