~ ~ ~
Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 60

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 60

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 60

Warning: mktime() [function.mktime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 60

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 61

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /var/www/custom/archive.cmdm/config.php on line 62

Deprecated: Function ereg_replace() is deprecated in /var/www/custom/archive.cmdm/article.php on line 102
针对心律不齐的超声波研究 - China Medical Device Manufacturer
CMDM

- English | 中文

Fri, January 19th, 2018

2006年5/6月刊 » 技术新知
针对心律不齐的超声波研究

杜克大学(美国北卡罗来纳州,Durham; www.duke.edu) 的工程师正在开发一种新型超声波技术,让医生能够对心脏内部进行直观化的三维扫描。与传统的超声波检查法相比,新技术将极大提高图像的质量。常规旧式的超声波扫描仪对身体只能进行二维扫描,且每次只有一张图像,主管杜克大学工程学院项目的生物医学工程教授Stephen Smith解释道, 而三维扫描仪可以对身体进行四面的90锥状扫描,在显示屏上可一次显示五张图像。该技术能实时显现立体图案,因此可以对导致心房纤维性颤动(心律不齐的最常见形式)的异常组织进行定位。技术的适用领域还包括:经中隔导管插入术、心房间隔缺损经导管封堵术、起博器电极的植入与取出,以及腹部大动脉移植的监控。

此项研究的另一目标是,利用超声波产生的热量进行异常组织的选择性破坏(切除)。一旦导管内矩阵成像器选中一个异常组织标本,环形传感器将发出一道治疗光束,切除心脏组织的异常生物电传导。此项研究分别借鉴了之前用内部超声探针进行成像以及组织切除工作的经验。与X射线相比,这种五年前既已开发的探针虽能提供更好的视觉指导,但它只能捕获二维图像。现在由于电缆技术的进步,三维成像和切除功能可集成在同一导管内。Smith的研究小组正在研制一种小至3mm、具有成像及切除双重功能的超声探针。我们已开始尝试将200根超细电缆装入直径只有3毫米的导管内。他说道。

此项研究未来可能大幅改善现有切除技术,即通过电极探针发出的无线电波对所选组织进行接触和加热。内部探针经过动脉穿入心脏后,目前医生只能利用荧光成像技术辅助探针的定位。但Smith说,荧光透视法无法对软组织进行成像,所以心脏图像只是一团模糊的背景。所以,荧光透视法只能为医生们提供微乎其微的大概指导,Smith 补充说。超声波切除的好处是,你根本就不用触及组织,他解释道,声波通过血液传播,可以在距离组织1-2cm的地方执行切除操作。

Smith解释说,利用一个10兆赫的传感器进行切除, 一个5兆赫、112道的矩成像器获取图像,两者可以合作无间,轮流进行成像和切除的步骤。理论上说,应该要按下一个按钮就可以继续成像,但同时使用两种功能时,噪音会相当大。他承认,要制造一个小至可以通过血管,插入真实心脏,进行直观成像和切除试验的探针,还需要进一步缩小设备,并加入其他设计才有可能。我们已有了设计灵感,可以做一些初步的试验,他说道,但目前仍处于开发的早期阶段,我想大概还需要四年的时间,才能将这种技术用于活体动物或患者的试验中。


版权所有 © 2005-2010 医疗设计和制造OEM (CMDM) 本网站所有内容,如未获书面同意,不得以任何形式转载和节录。违反上述声明者,我方将依法追究法律责任。

本期其他技术新知

- 主页 | 当期杂志 | 订阅 | 联系方式 | 关于我们 -©2011 汇科传讯集团 医疗设计和制造OEM 版权所有.