磁共振螺旋桨扫描技术在颈椎及脊髓检查中的应用价值

Application value of magnetic resonance helical scanning technology in cervical spine and spinal cord examination

关键词:  螺旋桨采集技术  颈椎磁共振成像  螺旋桨T2加权成像/快速自旋回波序列  伪影

Key words:  periodically rotated overlapping parallel lines with enhanced reconstruction acquisition cechnique  cervical spine magnetic resonance imaging  propeller T2-weighted imaging/fast spin-echo sequence  artifact

摘要:

目的评估磁共振螺旋桨(periodically rotated overlapping parallel lines with enhanced reconstruction, PROPELLER)采集技术在消除颈椎及脊髓检查中的伪影、提高图像清晰度和病变检出率的临床应用价值。 方法对68例接受颈椎MRI检查的患者，分别使用常规T2加权成像的快速自旋回波序列(T2 weighted imaging/turbo spin echo, T2WI/TSE)和PROPELLER T2WI快速自旋回波序列(PROPELLER T2WI/TSE)进行颈椎T2WI矢状位成像，评价两种扫描序列在图像清晰度、图像综合评分、脊髓及硬脑膜的可视化、病变检测效力及图像品质方面的差异。 结果PROPELLER T2WI/TSE序列能明显提高图像质量，患者图像产生的运动伪影、截断伪影、脉动伪影明显较常规T2WI/TSE序列减少；图像脑脊液的亮度、神经根的清晰度、椎间盘与脑脊液对比度、椎间盘与脊髓对比度、椎间盘形态异常清晰度的可视化方面较常规T2WI/TSE序列明显提高(P<0.05)。在图像信噪比方面，PROPELLER T2WI/TSE序列组相同位置正常椎体骨髓、椎间盘、脑脊液的图像信噪比高于常规T2WI/FSE序列组(P<0.05)；在图像对比噪声比方面，PROPELLER T2WI/TSE序列组相同位置脑脊液/脊髓、脑脊液/椎体骨髓、脑脊液/椎间盘层面的图像对比噪声比高于常规T2WI/FSE序列组(P<0.05)。 结论用于颈椎MRI检查的PROPELLER T2WI序列能够显著消除及减轻伪影，提升图像清晰度及颈椎、脊髓的解剖结构显示，进而更有效地显示病变。

Abstract:

ObjectiveTo evaluate the application value of magnetic resonance periodically rotated overlapping parallel lines with enhanced reconstruction(PROPELLER) acquisition technology in eliminating artifacts, improving image clarity and lesion detection rate in cervical spine and spinal cord examinations. MethodsA total of 68 patients undergoing cervical spine MRI examinations were compared using conventional T2 weighted imaging(T2WI) fast spin-echo sequences(T2WI /turbo spin echo, T2WI/TSE) and PROPELLER T2WI fast spin-echo sequences(PROPELLER T2WI/TSE) for cervical T2WI sagittal imaging. The differences in image clarity, image overall score, visualization of the spinal cord and dura mater, lesion detection efficacy, and image quality between the two scanning sequences were evaluated. ResultsThe PROPELLER T2WI/TSE sequence significantly improved image quality, with reduced motion artifacts, truncation artifacts, and pulsation artifacts compared to the conventional T2WI/TSE sequence. The brightness of cerebrospinal fluid, clarity of nerve roots, contrast between intervertebral discs and cerebrospinal fluid, contrast between intervertebral discs and spinal cord, and visualization of abnormal intervertebral disc morphology were significantly improved in the PROPELLER T2WI/TSE sequence compared to the conventional T2WI/TSE sequence(all P<0.05). In terms of image signal-to-noise ratio(SNR), the PROPELLER T2WI/TSE sequence group exhibited higher SNRs in normal vertebral bone marrow, intervertebral discs, and cerebrospinal fluid at the same positions compared to the conventional T2WI/FSE sequence group(all P<0.05); in terms of image contrast-to-noise ratio(CNR), the PROPELLER T2WI/TSE sequence group exhibited higher CNRs in cerebrospinal fluid/spinal cord, cerebrospinal fluid/vertebral bone marrow, and cerebrospinal fluid/intervertebral disc levels at the same positions compared to the conventional T2WI/FSE sequence group(all P<0.05). ConclusionThe PROPELLER T2WI sequence used for cervical spine MRI examinations can significantly eliminate and reduce artifacts, improve image clarity and display of cervical spine and spinal cord anatomy, thereby displays lesions more effectively.