目的比较心内接触与非接触性标测在指导儿童频发室性早搏导管消融术中的优越性、安全性和适应证的选择。方法研究对象为2002年8月至2008年6月广东省人民医院收治的8例无器质性心脏病的频发室性早搏患儿,24h室早总数平均(30000±8465...目的比较心内接触与非接触性标测在指导儿童频发室性早搏导管消融术中的优越性、安全性和适应证的选择。方法研究对象为2002年8月至2008年6月广东省人民医院收治的8例无器质性心脏病的频发室性早搏患儿,24h室早总数平均(30000±8465)个。采用Ensite非心内接触性标测系统指导消融4例,年龄10～14岁,右室流出道2例,右室流入道2例;传统心内接触性标测指导消融4例,年龄6～10岁,右室流出道2例,右室流入道1例,左室流出道1例。术前和术后1、3个月记录24h室早总数,记录两种方法的X线曝光时间、并发症和适应证。结果两种方法术后均获即刻成功,无并发症发生,7例术后1、3个月室早总数0～5个/24h,其中1例左室流出道室早复发,先后2次消融成功;X线曝光时间右室流出道:16.5min vs 32.5min,右室流入道:26.5min vs 60min,心内接触性标测消融左室流出道室早:90min。结论EnSite非接触性三维标测较接触性标测下消融有许多优越性,但同样也存在着局限性,心内接触性标测适应性广,是非接触性三维标测的基础和补充,尤其在EnSite非接触性三维标测标测失败时。展开更多
Gravity anomalies illuminate subsurface lithology and geological structure in three dimensions,which is vital for studies of concealed faults,sedimentary basins,basement lithology,and other geological targets.Although...Gravity anomalies illuminate subsurface lithology and geological structure in three dimensions,which is vital for studies of concealed faults,sedimentary basins,basement lithology,and other geological targets.Although not all geological contacts correspond to lithological contacts,the contact mapping provides key information on structural regimes,deformation styles and trends.Many techniques for contact mapping have been developed.Here,we evaluate five methods applied to gridded data.The first two are the horizontal gradient magnitude of the gravity field （GFhgm）,and tilt （TIhgm）.The third and fourth rely on locating maxima of the analytic signal （AS） and the 3D local wavenumber （LW）.The fifth is normalized standard deviation （NSTD） method.In this article,we evaluate the use of these five methods for mapping contacts and compare the results.First,synthetic vertically-sided models are used to quantify the offsets of maxima from the true contact location due to the source effects of finite source thickness,central depth,and width.Second,the effects of contact dip are discussed.Finally,a real data set is used to evaluate the ability of each method to produce maps of coherent contact trends in the presence of noise and gridding artifacts.展开更多
文摘目的比较心内接触与非接触性标测在指导儿童频发室性早搏导管消融术中的优越性、安全性和适应证的选择。方法研究对象为2002年8月至2008年6月广东省人民医院收治的8例无器质性心脏病的频发室性早搏患儿,24h室早总数平均(30000±8465)个。采用Ensite非心内接触性标测系统指导消融4例,年龄10～14岁,右室流出道2例,右室流入道2例;传统心内接触性标测指导消融4例,年龄6～10岁,右室流出道2例,右室流入道1例,左室流出道1例。术前和术后1、3个月记录24h室早总数,记录两种方法的X线曝光时间、并发症和适应证。结果两种方法术后均获即刻成功,无并发症发生,7例术后1、3个月室早总数0～5个/24h,其中1例左室流出道室早复发,先后2次消融成功;X线曝光时间右室流出道:16.5min vs 32.5min,右室流入道:26.5min vs 60min,心内接触性标测消融左室流出道室早:90min。结论EnSite非接触性三维标测较接触性标测下消融有许多优越性,但同样也存在着局限性,心内接触性标测适应性广,是非接触性三维标测的基础和补充,尤其在EnSite非接触性三维标测标测失败时。
基金supported by the Ph.D. Program Foundation of Ministry of Education of China for Distinguished Young Scholars (No. 200804911523)the Research Foundation for Outstanding Young Teachers,China University of Geosciences (No. CUGQNL0726)
文摘Gravity anomalies illuminate subsurface lithology and geological structure in three dimensions,which is vital for studies of concealed faults,sedimentary basins,basement lithology,and other geological targets.Although not all geological contacts correspond to lithological contacts,the contact mapping provides key information on structural regimes,deformation styles and trends.Many techniques for contact mapping have been developed.Here,we evaluate five methods applied to gridded data.The first two are the horizontal gradient magnitude of the gravity field （GFhgm）,and tilt （TIhgm）.The third and fourth rely on locating maxima of the analytic signal （AS） and the 3D local wavenumber （LW）.The fifth is normalized standard deviation （NSTD） method.In this article,we evaluate the use of these five methods for mapping contacts and compare the results.First,synthetic vertically-sided models are used to quantify the offsets of maxima from the true contact location due to the source effects of finite source thickness,central depth,and width.Second,the effects of contact dip are discussed.Finally,a real data set is used to evaluate the ability of each method to produce maps of coherent contact trends in the presence of noise and gridding artifacts.
