Keskin Kübra, Cui Sophia X, Li Bochao, Gross Jordan S, Acharya Jay, Buser Zorica, Lieberman Jay R, Hargreaves Brian A, Nayak Krishna S
Electrical and Computer Engineering, University of Southern California, Los Angeles, California, USA.
Siemens Medical Solutions USA, Los Angeles, California, USA.
Magn Reson Med. 2025 Jul;94(1):242-250. doi: 10.1002/mrm.30438. Epub 2025 Mar 28.
To compare 0.55 T and 3 T MRI for imaging patients with titanium total hip arthroplasty (THA). Patients with orthopedic metallic implants often require diagnostic imaging to evaluate adjacent tissues. MRI performance measures, including artifact levels and SNR, vary with field strength.
Six patients with titanium THA were scanned with similar protocols at 0.55 T and 3 T, including proton density (PD) weighted turbo spin echo (TSE), PD TSE with view-angle tilting (TSE + VAT), PD slice encoding for metal artifact correction (SEMAC), and short tau inversion recovery with SEMAC (STIR-SEMAC). Images from both field strengths were scored by two readers and qualitatively and quantitatively compared.
Diagnostic confidence was significantly higher at 0.55 T compared to 3 T. Perceived metal artifact was substantially reduced at 0.55 T compared to 3 T. At 0.55 T, diagnostic imaging was achieved both without and with multi spectral imaging (MSI) for PD weighted images.
Compared to 3 T, 0.55 T MRI offers substantially reduced metal artifacts and higher diagnostic confidence when imaging titanium THA. Advanced multi-spectral techniques may not be required when the metallic components are entirely titanium.
比较0.55T和3T磁共振成像（MRI）对钛合金全髋关节置换术（THA）患者的成像效果。骨科金属植入物患者通常需要进行诊断性成像以评估邻近组织。MRI的性能指标，包括伪影水平和信噪比，会随场强而变化。
对6例钛合金THA患者分别采用相似的方案在0.55T和3T进行扫描，包括质子密度（PD）加权快速自旋回波（TSE）、带视角倾斜的PD TSE（TSE+VAT）、用于金属伪影校正的PD层面编码（SEMAC）以及带SEMAC的短tau反转恢复序列（STIR-SEMAC）。两位阅片者对两种场强下的图像进行评分，并进行定性和定量比较。
与3T相比，0.55T时的诊断置信度显著更高。与3T相比，0.55T时感知到的金属伪影明显减少。在0.55T时，无论有无对PD加权图像进行多光谱成像（MSI）均可实现诊断性成像。
与3T相比，0.55T MRI在对钛合金THA成像时金属伪影明显减少，诊断置信度更高。当金属部件完全为钛合金时，可能无需先进的多光谱技术。
