CAJ | 학술논문

目的探讨信噪比对肾透明细胞癌多b值DWI信号强度变化趋势可能的影响.方法回顾性分析2011年7月至2012年4月在常州市第一人民医院放射科17例透明细胞癌患者的影像学资料,其中17个肿瘤病灶,9个单纯性囊肿纳入统计.分别测量囊肿及肿瘤的各b值DWI信号强度.寻找适合囊肿呈单指数函数变化的最低信噪比(即,阈值);计算透明细胞癌各b值DWI的信噪比,并采用两独立样本t检验将其与阈值比较.结果肾囊肿及透明细胞癌的DWI信号强度均随着b值的增大而减小.囊肿的多b值DWI信号强度变化呈单指数函数的最小信噪比(阈值)为(1.29±0.17)(b =800 s/mm2).在肾脏透明细胞癌各b值DWI中,当b=1 000 s/mm2时,其信噪比与阈值差异无统计学意义(t =0.40,P=0.69);当b=1 200时,信噪比低于阈值(￡=-2.38,P=0.03).结论信噪比足够高是DWI定量分析的前提条件,适合肾透明细胞癌DWI分析的最大b值为1 000 s/mm2.
목적 탐토신조비대신투명세포암다b치DWI신호강도변화추세가능적영향.방법 회고성분석2011년7월지2012년4월재상주시제일인민의원방사과17례투명세포암환자적영상학자료,기중17개종류병조,9개단순성낭종납입통계.분별측량낭종급종류적각b치DWI신호강도.심조괄합낭종정단지수함수변화적최저신조비(즉,역치);계산투명세포암각b치DWI적신조비,병채용량독립양본t검험장기여역치비교.결과 신낭종급투명세포암적DWI신호강도균수착b치적증대이감소.낭종적다b치DWI신호강도변화정단지수함수적최소신조비(역치)위(1.29±0.17)(b =800 s/mm2).재신장투명세포암각b치DWI중,당b=1 000 s/mm2시,기신조비여역치차이무통계학의의(t =0.40,P=0.69);당b=1 200시,신조비저우역치(￡=-2.38,P=0.03).결론 신조비족구고시DWI정량분석적전제조건,괄합신투명세포암DWI분석적최대b치위1 000 s/mm2.
Objective To explore the influence of signal noise ratio (SNR) on analysis of clear cell renal cell carcinoma (CCRCC) using DWI with multi-b values.Methods The images of 17 cases with CCRCC were analyzed,including 17 masses and 9 pure cysts.The signal intensity of the cysts and masses was measured separately on DWI for each b value.The minimal SNR,as the threshold,was recorded when the signal curve manifest as the single exponential line.The SNR of the CCRCC was calculated on DWI for each b value,and compared with the threshold by independent Two-sample t Test.Results The signal decreased on DWI with increased b factors for both pure cysts and CCRCC.The threshold is 1.29 ± 0.17,and the signal intensity of the cysts on DWI with multi-b values shown as a single exponential line when b ≤ 800 s/mm2.For the CCRCC,the SNR is similar to the threshold when b =1 000 s/mm2 (t =0.40,P =0.69),and is lower when b=1 200 s/mm2(t =-2.38,P=0.03).Conclusion The SNR should be sufficient for quantitative analysis of DWI,and the maximal b value is 1000 s/mm2 for CCRCC.