Xtras的完整的定义应该是：按Macromedia的开发规范Xtra Development Kit(XDK)开发出来的，为Macromedia的产品提供扩展功能的部分。对用户来说，他们不需要什么新的知识就可以熟练使用这些功能，因为它们都是用相同的C语言模板开发出...Xtras的完整的定义应该是：按Macromedia的开发规范Xtra Development Kit(XDK)开发出来的，为Macromedia的产品提供扩展功能的部分。对用户来说，他们不需要什么新的知识就可以熟练使用这些功能，因为它们都是用相同的C语言模板开发出来的。具体说来，Authorware中的Xtras可以分为五类：展开更多
老师们辛辛苦苦制作的Athorware课件只能在自己的电脑中很好地运行，但在打包后移到其他的电脑中运行时，经常会出现提示“The transition Xtra(xtra name)specified by this icon is not available”，丢失了原来所做的效果。出现这个...老师们辛辛苦苦制作的Athorware课件只能在自己的电脑中很好地运行，但在打包后移到其他的电脑中运行时，经常会出现提示“The transition Xtra(xtra name)specified by this icon is not available”，丢失了原来所做的效果。出现这个问题的原因是：为某个显示图标选择了一个External Xtra，但程序在运行中却找不到这个外部过程文件，所以生成的exe文件只好在运行时去找外部过程了。展开更多
Dose estimation and quality control in computed tomography (CT) scanners are useful in controlling the dose of radiation given to patients while tests are carried out. The study was performed in a 16-slice Computed To...Dose estimation and quality control in computed tomography (CT) scanners are useful in controlling the dose of radiation given to patients while tests are carried out. The study was performed in a 16-slice Computed Tomography (CT) system of LightSpeed RT16 Xtra CT scanner. Quality control was done using a vendor-provided QA Phantom, and the six aspects of image quality were measured. For CT dosimetry, Computed Tomography Dose index volume (CTDIvol) was performed using Computed Tomography Dose Index (CTDI) Phantom. CTDI Phantom consists of three parts: Pediatric Head, Adult Head, and Adult Body Phantom. A 10 cm long pencil ion chamber DCT-10 was used to measure the dose at different positions inside the CTDI Phantom. Data were collected using MagicMax Universal software. For dose estimation of the CTDIvol Report of AAPM Task Group, 96 and 111 formalisms were used. For Pediatric Head, Adult Head, and Adult Body Phantom the measured CIDIvol was 61.04 mGy, 48.11 mGy, and 18.08 mGy respectively. The study has shown deviations of 7%, 15%, and 19% between estimated and console-displayed doses for Pediatric Head, Adult Head, and Adult Body scan techniques respectively. The six aspects of image quality measured by QA Phantom were found to be compatible with the specifications of the machine and CTDIvol measured by CTDI Phantom were found within a tolerance limit of ±20%. Hence, the QC and dosimetry of the mentioned machine are within the limit.展开更多
文摘Xtras的完整的定义应该是：按Macromedia的开发规范Xtra Development Kit(XDK)开发出来的，为Macromedia的产品提供扩展功能的部分。对用户来说，他们不需要什么新的知识就可以熟练使用这些功能，因为它们都是用相同的C语言模板开发出来的。具体说来，Authorware中的Xtras可以分为五类：
文摘老师们辛辛苦苦制作的Athorware课件只能在自己的电脑中很好地运行，但在打包后移到其他的电脑中运行时，经常会出现提示“The transition Xtra(xtra name)specified by this icon is not available”，丢失了原来所做的效果。出现这个问题的原因是：为某个显示图标选择了一个External Xtra，但程序在运行中却找不到这个外部过程文件，所以生成的exe文件只好在运行时去找外部过程了。
文摘Dose estimation and quality control in computed tomography (CT) scanners are useful in controlling the dose of radiation given to patients while tests are carried out. The study was performed in a 16-slice Computed Tomography (CT) system of LightSpeed RT16 Xtra CT scanner. Quality control was done using a vendor-provided QA Phantom, and the six aspects of image quality were measured. For CT dosimetry, Computed Tomography Dose index volume (CTDIvol) was performed using Computed Tomography Dose Index (CTDI) Phantom. CTDI Phantom consists of three parts: Pediatric Head, Adult Head, and Adult Body Phantom. A 10 cm long pencil ion chamber DCT-10 was used to measure the dose at different positions inside the CTDI Phantom. Data were collected using MagicMax Universal software. For dose estimation of the CTDIvol Report of AAPM Task Group, 96 and 111 formalisms were used. For Pediatric Head, Adult Head, and Adult Body Phantom the measured CIDIvol was 61.04 mGy, 48.11 mGy, and 18.08 mGy respectively. The study has shown deviations of 7%, 15%, and 19% between estimated and console-displayed doses for Pediatric Head, Adult Head, and Adult Body scan techniques respectively. The six aspects of image quality measured by QA Phantom were found to be compatible with the specifications of the machine and CTDIvol measured by CTDI Phantom were found within a tolerance limit of ±20%. Hence, the QC and dosimetry of the mentioned machine are within the limit.
