■手腕和手掌的周围神经的磁共振成像由于体积小而具有挑战性,曲折的过程,复杂的周围组织,和伴随的血管。腕掌病变的发生导致水肿,肿胀,和质量效应,这可能进一步干扰神经的显示和识别。
■为了评估对比增强磁共振神经造影(ceMRN)是否可以改善中位数的形态和病理的可视化,尺神经,和他们的小树枝在手腕和手掌。
■一项观察性研究。
■总共57个科目,包括36名志愿者和21名腕掌病变患者,在3.0Tesla时进行了ceMRN和非对比MRN(ncMRN)检查。血管抑制的程度,神经可视化,诊断信心,两名放射科医生对病变显著性进行了定性评估。获得了读者间协议的Kappa统计数据。信噪比,对比度(CR),测量正中神经的对比噪声比(CNR)。比较了ncMRN和ceMRN的主观评分和定量测量。
■对于每个神经段的所有定性评估和可视化评估,读者之间的一致性非常好(k>0.8)。与ncMRN相比,ceMRN显著改善志愿者和患者的血管抑制(均p<0.001)。ceMRN显着增强了各节段的神经可视化(均p<0.05)以及志愿者和患者的诊断信心(均p<0.05)。ceMRN改善了患者的病变显著性(p=0.003)。定量地,ceMRN的神经CRs明显高于皮下脂肪,骨髓,与ncMRN相比,神经血管和血管的CNR(均p<0.05)。
■ceMRN通过强烈抑制脂肪信号,显着改善手腕和手掌中周围神经和病理的可视化,骨髓,尤其是志愿者和患者的血管。
使用造影剂改善手腕和手掌中小神经的磁共振成像和病变显示的研究为什么进行了这项研究?因为手腕和手掌中的神经和分支众多,小,曲折,被肌肉包围,脂肪,骨头,血管和其他组织,用常规磁共振成像很难显示它们的完整形状。手部病变常导致肿胀,水肿和肿块,干扰神经的显示。因此,临床很难直接诊断病变与神经的关系。研究人员做了什么?研究小组使用造影剂加三维高分辨率磁共振序列显示志愿者和手部病变患者的神经,并采用主观和客观评价方法,比较使用对比剂前后序列对神经的显示效果。研究人员发现了什么?造影剂加三维高分辨率磁共振序列的成像方法可以减少脂肪的干扰,血管,等。在神经显示上,改善手腕和手掌的每个神经段的显示效果,增加读者识别神经的信心,并提高病变的检测。这项研究验证了使用造影剂对手腕和手掌神经进行磁共振成像的可行性和优势。为手部病变的临床和影像学诊断提供了新的方法,可以同时显示神经和病变的形态特征,降低临床诊断难度,提高影像诊断效率。
UNASSIGNED: Magnetic resonance imaging of peripheral nerves in the wrist and
palm is challenging due to the small size, tortuous course, complex surrounding tissues, and accompanying blood vessels. The occurrence of carpal palmar lesions leads to edema, swelling, and mass effect, which may further interfere with the display and identification of nerves.
UNASSIGNED: To evaluate whether contrast-enhanced magnetic resonance neurography (ceMRN) improves the visualization of the morphology and pathology of the median, ulnar nerves, and their small branches in the wrist and
palm.
UNASSIGNED: An observational study.
UNASSIGNED: In total 57 subjects, including 36 volunteers and 21 patients with carpal palmar lesions, were enrolled and underwent ceMRN and non-contrast MRN (ncMRN) examination at 3.0 Tesla. The degree of vascular suppression, nerve visualization, diagnostic confidence, and lesion conspicuity was qualitatively assessed by two radiologists. Kappa statistics were obtained for inter-reader agreement. The signal-to-noise ratio, contrast ratio (CR), and contrast-to-noise ratio (CNR) of the median nerve were measured. The subjective ratings and quantitative measurements were compared between ncMRN and ceMRN.
UNASSIGNED: The inter-reader agreement was excellent (k > 0.8) for all qualitative assessments and visualization assessment of each nerve segment. Compared with ncMRN, ceMRN significantly improved vascular suppression in volunteers and patients (both p < 0.001). The ceMRN significantly enhanced nerve visualization of each segment (all p < 0.05) and diagnostic confidence in volunteers and patients (both p < 0.05). The ceMRN improved lesion conspicuity (p = 0.003) in patients. Quantitatively, ceMRN had significantly higher CRs of nerve versus subcutaneous fat, bone marrow, and vessels and CNR of nerve versus vessel than ncMRN (all p < 0.05).
UNASSIGNED: The ceMRN significantly improves the visualization of peripheral nerves and pathology in the wrist and
palm by robustly suppressing the signals of fat, bone marrow, and especially vessels in volunteers and patients.
Study on the improvement of magnetic resonance imaging and lesion display of small nerves in the wrist and
palm using contrast agents Why was the study done? Because the nerves and branches in the wrist and
palm are numerous, small, tortuous, and surrounded by muscles, fat, bones, blood vessels and other tissues, it is difficult to show their complete shape with conventional magnetic resonance imaging. Hand lesions often lead to swelling, edema and masses, which interfere with the display of nerves. Therefore, it is difficult to directly diagnose the relationship between the lesions and nerves in clinical practice. What did the researchers do? The research team used contrast agent plus three-dimensional high-resolution magnetic resonance sequence to display the nerves of volunteers and patients with hand lesions, and used subjective and objective evaluation methods to compare the display effect of the sequence on the nerves before and after the use of contrast agent. What did the researchers find? The imaging method of contrast agent plus three-dimensional high-resolution magnetic resonance sequence can reduce the interference of fat, blood vessels, etc. on nerve display, improve the display effect of each nerve segment of the wrist and palm, increase readers’ confidence in identifying nerves, and improve the detection of lesions. What do the findings mean? This study verified the feasibility and advantages of using contrast agents for magnetic resonance imaging of nerves in the wrist and palm. It provides a new method for clinical and imaging diagnosis of hand lesions, which can simultaneously display the morphological characteristics of nerves and lesions, reducing the difficulty of clinical diagnosis and improving the efficiency of imaging diagnosis.