MR 螺旋槳掃描技術在消除偽影方面的
臨床應用
戈明媚 王秋良 劉志欽 劉曉林 廖玉珍 孫瑋 孫楠 張英魁
【摘要】 目的 探討螺旋槳掃描技術( periodically rotated overlapping parallel lines enhanced
reconstruction , PROPELLER) 在臨床的應用價值。方法 對10 例健康志愿者在頭部晃動狀態下、64
例頭顱MR 檢查中出現躁動不合作或口腔有固定金屬異物的患者, 應用PROPELLER 技術進行T2WI
和( 或) 擴散加權成像( DWI) , 與常規T2WI 和( 或) DWI 進行對比。64 例患者中, 腦梗死40 例( 其中
腦干梗死16 例) , 腦梗死伴腦出血1 例, 腦轉移瘤3 例, 癲癇、病毒性腦炎和高血壓等20 例。56 例為
運動偽影, 8 例為金屬異物引起的磁敏感偽影。結果 10 例健康志愿者PROPELLER T2W 圖像質量
明顯優于常規T2WI。分別對10 例志愿者和56 例患者的常規T2WI、DWI 與PROPELLER T2WI、DWI
的圖像進行比較, 顯示因運動產生的偽影, 導致圖像質量降低, 無法達到診斷要求; 采用PROPELLER
T2WI, 均顯著消除偽影的影響, 病變顯示清晰, 診斷明確。8 例因固定義齒產生的磁敏感偽影, 采用
PROPELLER DWI, 均明顯消除偽影干擾, 獲得有診斷價值的圖像。結論 應用PROPELLER T2WI、
DWI 技術, 明顯消除患者因運動或金屬異物造成的偽影, 可生成高分辨率、無偽影、具有臨床診斷意
義的理想圖像。
【關鍵詞】 磁共振成像; 圖像處理, 計算機輔助; 對比研究
Clinica l applicat ion of MR PROPELLER technology in ar tifact s reduction GE Ming-mei* , WANG
Qiu-lia ng , LIU Zhi-qin, LIU Xiao-lin, LIAO Yu-zhen, SUN Wei, SUN Nan, ZHANG Ying-kui. * Department of
Radiology, General Hospital of Beijing Army, Beijing 100700, China
【Abstra ct 】 Objective The aim of this study was to assess the clinical value of PROPELLER
( periodically rotated overlapping parallel lines enhanced reconstruction, PROPELLER) . Methods Four
sequences of conventionality and PROPELLER axial T2 -weighted imaging ( T2WI) and / or diffusion weighted
imaging ( DWI ) were performed in ten normal volunteers with head ceaseless motion and 64 clinical
subjects. Motion artifacts were observed in 56 patients in unconsciousness and magnetic-sensitive artifacts in
other 8 patients with metallic implants. PROPELLER images and the conventionality images were compared.
Results Sixty-four clinical subjects included the cerebral infarction ( n = 41) , brain metastasis ( n = 3) and
others disorders ( n = 20) . PROPELLER T2WI had clearer and motion-artifact-free images in both volunteers
and patients in unconsciousness. In dental treatment cases , magnetic-susceptibility artifacts were greatly
reduced to an accepted level. Comparing with conventional sequences, PROPELLER T2WI /DWI sequences
showed promising feature in reduction of artifacts and distinctly defined pathological profile. Conclusion
MR PROPELLER technique offers a means of reducing motion and metallic artifacts , and improving image
quality. Intracranial pathology is equally or better demonstrated with PROPELLER.
【Key words】 Magnetic resonance imaging; Image processing, computer-assisted; Comparative
study

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