摘要
目的探讨周期性旋转重叠平行线采集和增强后处理重组（PROPELLER）技术在颅底DWI应用中的价值。方法收集因耳鼻喉部症状而在我院行MRI检查的61例连续患者，行颅底FSE—PROPELLERDWI与SE-平面回波（EPI）DWI扫描，b值分别采用500、1000s／mm^2，根据是否发现病变分为病变组和正常组。对各组不同b值和序列图像进行变形评分，并计算信噪比（SNR），采用配对t检验进行比较。采用配对X。检验比较病变组两种序列DWI的病变显示率。结果正常组和病变组患者分别为16和45例。b=1000s／mm。时，正常组SE—EPIDWI和FSE—PROPELLERDWI序列的评分分别为（1．34±0．48）和（3．94±0．25）分，病变组分别为（1．57±0．54）和（3．94±0．23）分；b=500s／mm。时，正常组SE—EPIDWI和FSE—PROPELLERDWI序列的评分分别为（1．38±0．49）和（3．97±0．18）分，病变组分别为（1．60±0．54）和（3．97±0．18）分，差异均有统计学意义（t值分别为-29．40、-40．84、-29．40和-42．45，P值均〈0．01）。b=1000s／ram。时，除小脑半球和颞极部脑实质SNR差异无统计学意义外，其余颅底结构FSE—PROPELLERDWI的SNR均高于SE—EPIDWI，SNR的差异有统计学意义（P值均〈0．05）；b=500s／ram。时，除小脑半球、颞极部脑实质和颞肌SNR差异无统计学意义外，其余颅底结构FSE—PROPELLERDWI的SNR均高于SE—EPIDWI，SNR的差异有统计学意义（P值均〈0．05）。病变组中，PROPELLERDWI病变显示率（97．78％，44／45）明显高于EPIDWI病变显示率（64．44％，29／45），差异有统计学意义（x^2=16．317，P〈0．01）。结论PROPELLER技术能减少或消除DWI颅底变形和伪影，提高图像质量和病变显示率，因而在颅底病变的诊断和疗效评估中有价值。
Objective To evaluate the role of periodically rotated overlapping parallel lines enhanced reconstruction （PROPELLER） DWI in skull base. Methods Both PROPELLER and echo-planar imaging （EPI） DWI with b values of 500 and 1 000 s/mmz in skull base were performed in 61 consecutive patients who had been examined with routine head and neck MRI because of symptoms of ear or nose or throat. All of 61 patients were divided into two groups： the normal group without lesion and the lesion group with lesions on MRI. The mean distortion scores and SNRs of structures in skull base with different DWI sequences （PROPELLER and EPI） and b values were compared by paired sample t test in each group. Moreover, the positive rates of PROPELLER DWI were contrasted with those of EPI DWI by paired data 2 test in the lesion group. Results The normal group included 16 patients, and the lesion group included 45 patients. With b values of 1 000 s/mm2 , the mean distortion scores of EPI DWI and PROPELLER DWI in normal group were 1.34 ±0.48, 3.94 ±0.25 respectively, and were 1.57 ±0.54, 3.94 ±0.23 respectively in the lesion group. With b values of 500 s/mm2, the mean distortion scores of EPI DWI and PROPELLER DWI in normal group were 1.38 ±0.49, 3.97 ±0. 18, respectively, and were 1.60 ±0. 54, 3.97 ±0. 18 respectively in the lesion group. There were significant difference in the mean distortion scores between EPI DWI and PROPELLER DWI with b values of 1 000 or 500 s/mm2 in both groups （ with t values of -29. 40, -40. 84, -29. 40, and -42.45 respectively, and P 〈0. 01 ）. With b value of I 000 s/ram2 , the mean SNRs of PROPELLER DWIs in all of the skull base structures except for cerebellar hemisphere and temporal pole were higher than those of EPI DWIs （ P 〈 0. 05 ）. Also, with b value of 500 s/mm2 , the mean SNRs of PROPELLER DWIs in all of the skull base structures were higher than those of EPI DWIs except for ceret）ellar hemisphere, temporal pole and temporalis. Moreover, the positive rate of PROPELLER DWI （97.78% , 44/45） in the lesion group with masses was significantly higher （2 = 16. 317, P 〈 0. 01 ） than that of EPI DWI （ 64. 44%, 29/45 ）. Conclusions PROPELLER technique can reduce or eliminate distortion and artifacts, increase the image quality and the positive rate of lesion on diffusion-weighted images. Therefore, PROPELLER DWI is regarded useful in the diagnoses and the evaluation of therapeutic effect in patients with lesions in skull base.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2014年第1期29-32,共4页
Chinese Journal of Radiology
基金
北京市自然科学基金资助项目（7112030）
关键词
颅底
磁共振成像
图像质量
Skull base
Magnetic resonance imaging
hnage quality
