Influence of Susceptibility-weighted Imaging on Brain Magnetic Resonance Imaging Diagnostics
N Sanghan, V Charoonratana, S Hirunpat
Hong Kong J Radiol 2019;22:32-8
https://doi.org/10.12809/hkjr1916886
Objectives: To evaluate the influence of susceptibility-weighted imaging (SWI) on detection rates and reported results in the diagnosis of various brain conditions, compared with conventional magnetic resonance imaging (MRI).
Methods: Brain MRI was obtained for various indications in 251 patients (115 male, 136 female). The mean age of the patients was 49.91 years. Two neuroradiologists independently evaluated the detection rates and reported results of brain MRI with and without SWI sequences. Statistical analysis was performed by using McNemar’s Chi-square test and Cohen’s kappa coefficient.
Results: Neuroradiologists 1 and 2 considered SWI to have influenced detection in 51% and 53% of patients, respectively, and to have influenced the reported results in 20% and 18% of patients, respectively. SWI had the strongest influence in the detection rates of vascular disease in 22 patients (100%) and calcification and abscesses in two patients (100%). SWI had the strongest influence on the reported results of vascular disease in 20 patients (91%) and of neurodegenerative / demyelinating in 11 patients (79%). There was excellent inter-observer reliability between neuroradiologists 1 and 2 (kappa value = 0.883-0.936).
Conclusion: SWI is a helpful technique in routine brain MRI sequences, and influences the detection rates and reported results, especially for vascular disease, microbleeds, infection, neurodegenerative / demyelinating disease, and evaluation of intratumoral components. SWI should be added to conventional MRI sequences.
Author affiliation(s):
N Sanghan, V Charoonratana, S Hirunpat: Department of Radiology, Prince of Songkla University, Songkhla, Thailand
中文摘要
磁敏感加權成像對腦磁共振成像診斷的影響
N Sanghan、V Charoonratana、S Hirunpat
目的：與常規磁共振成像（MRI）相比，評估磁敏感加權成像（SWI）對檢測率和各種腦部疾病診斷報告結果的影響。
方法：選取251名患者（115名男性，136名女性）符合各種適應症的腦部MRI檢查。患者平均年齡為49.91歲。兩名神經放射學家獨立評估在有和沒有SWI序列下的腦部MRI檢測率和報告結果。研究使用McNemar卡方檢驗和Cohen kappa係數進行統計分析。
結果：第一名神經放射學家認為SWI對51%患者的檢測及20%患者的報告結果產生影響；第二名神經放射學家則認為SWI對53%患者的診斷及18%患者的報告結果產生影響。SWI對檢測血管疾病（22名患者，100%）及鈣化／膿腫（2名患者，100%）的影響最大。SWI對血管疾病（20名患者，91%）和神經退化／脫髓鞘（11名患者，79%）的報告結果影響最大。兩名神經放射學家的觀察者間信度極高（kappa值：0.883-0.936）。
結論： SWI是常規腦部 MRI序列中的一種有用技術，可影響檢測率和報告結果，特別是血管疾病、微出血、感染、神經退化／脫髓鞘疾病及腫瘤內成分的評估。應將 SWI加到常規 MRI序列中。