调频连续波雷达触发技术在老年患者腹部MRI检查中的价值

The value of frequency⁃modulated continuous⁃wave radar⁃triggering technology in abdominal MRI examination of elderly patients

目的 探讨调频连续波(frequency-modulated continuous-wave, FMCW)雷达触发技术在60岁及以上老年患者腹部磁共振检查中的价值。方法 2022年1月—3月,在复旦大学附属中山医院临床收集29例患有肝脏疾病的患者,分为中青年组19例(<60岁)和老年组10例(≥60岁),同时使用调频连续波雷达触发技术(FT)、膈肌导航触发技术(NT)、屏气扫描(BH)行肝脏磁共振T2WI成像,评估三者图像质量和成像时间,测量和比较信噪比SNR病灶、SNR肝、对比度噪声比CNR。结果 在中青年组中,NT图像质量最优(3.74±0.42,P=0.010),但扫描时间长于FT(P=0.008);三者在T2WI中SNR病灶、 SNR肝、 CNR差异无统计学意义。在老年组中,FT图像质量最优(3.55±0.50,P=0.029),并且扫描时间短于NT(P=0.001);三者的SNR_(病灶)、 SNR_(肝)、 CNR差异无统计学意义。2组中BH图像质量均低于FT和NT,扫描时间最短。结论 在腹部磁共振T2WI中,FT图像质量优于屏气扫描,与膈肌导航触发技术NT相当,且用时更短,在60岁及以上屏气不良的老年患者腹部MRI检查中具有更为广泛的临床应用前景。

Objective To explore the value of frequency⁃modulated continuous⁃wave(FMCW)radar⁃triggering tech⁃nology in abdominal magnetic resonance examination of elderly patients over 60 years old.Methods From January 2022 to March 2022,a total of 29 patients with liver disease were enrolled at Zhongshan Hospital Affiliated to Fudan University.They were divided into two groups according to age,including 19 cases in the young and middle⁃aged group(<60 years old)and 10 ones in the old group(≥60 years old).FMCW radar⁃triggered technique(FT),diaphragmatic navigation⁃triggering technique(NT)and breath⁃holding scan(BH)were simultaneously performed for liver magnetic resonance T2WI imaging in each sub⁃ject.The image quality and imaging time of three methods were assessed.The signal⁃to⁃noise ratio(SNR)of liver and lesion and contrast⁃to⁃noise ratio(CNR)were measured and compared among the three methods.Results In the young and middle⁃aged group,NT image quality was the best(3.74±0.42,P=0.010),but its scanning time was longer than that of FT(P=0.008).There was no statistically significant difference in SNRlesions,SNRliver,and CNR on T2WI among the three methods.In the elderly group,FT image quality was the best(3.55±0.50,P=0.029),and its scanning time was shorter than that of NT(P=0.001).There was no statistically significant difference in SNR_(lesions),SNR_(liver),and CNR on T2WI among the three meth⁃ods.In both groups,the image quality of BH was lower than that of FT and NT,and the scanning time was the shortest.Con⁃clusion In T2WI of abdominal magnetic resonance imaging,the image quality of FT is superior to that of BH,comparable to that of NT,and its time is shorter.It has a wider clinical application prospect in abdominal MRI examination of elderly people over 60 years old with poor breath⁃holding.