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About liver (实质回音不均质)

Chinese translation: heterogeneous parenchyma echo

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:实质回音不均质
Chinese translation:heterogeneous parenchyma echo
Entered by: Edward LIU

02:06 Apr 6, 2005
English to Chinese translations [PRO]
Medical: Health Care
English term or phrase: About liver (实质回音不均质)
What is a 回音 in the context of liver examination? Why 不均质? Should it have been 不均匀?
albertdeng
New Zealand
Local time: 23:23
实质回声不均
Explanation:
实质回声不均

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Note added at 3 hrs 56 mins (2005-04-06 06:03:36 GMT)
--------------------------------------------------

heterogeneous parenchyma echo

超声在介质中以直线传播,有良好的指向性。这是可以用超声对人体器官进行探测的基础。当超声传经两种声阻抗不同相邻介质的界面时其声阻抗差大于0.1%,而界面又明显大于波长,即大界面时,则发生反射,一部分声能在界面后方的相邻介质中产生折射,超声继续传播,遇到另一个界面再产生反射,直至声能耗竭。反射回来的超声为回声。声阻抗差越大,则反射越强,如果界面比波长小,即小界面时,则发生散射。超声在介质中传播还发生衰减,即振幅与强度减小。衰减与介质的衰减系数成正比,与距离平方成反比,还与介质的吸收及散射有关。超声还有多普勒应(Doppler effect),活动的界面对声源作相对运动可改变反射回声的回率。这种效应使超声能探查心脏活动和胎儿活动以及血流状态。

人体结构对超声而言是一个复杂的介质,各种器官与组织,包括病理组织有它特定的声阻抗和衰减特性。因而构成声阻抗上的差别和衰减上的差异。超声射入体内,由表面到深部,将经过不同声阻抗和不同衰减特性的器官与组织,从而产生不同的反射与衰减。这种不同的反射与衰减是构成超声图像的基础。将接收到的回声,根据回声强弱,用明暗不同的光点依次显示在影屏上,则可显出人体的断面超声图像。


--------------------------------------------------
Note added at 4 hrs 9 mins (2005-04-06 06:16:14 GMT)
--------------------------------------------------

肝内回声特点:正常肝实质呈中等或弱回声光点,其强度和频率皆均匀。
肝硬化时肝实质回声特点为:回声增粗、增强,可见斑块状强回声区;用适宜的增益条件扫描,看见多数低回声小结节镶嵌在肝实质内,前者由纤维化所致,后者系再生结节;随病变发展,出现肝结构紊乱、肝实质不均质改变,需要与弥漫性肝癌的声像图相鉴别。


--------------------------------------------------
Note added at 4 hrs 12 mins (2005-04-06 06:19:01 GMT)
--------------------------------------------------

“回声不均匀”的现象反映“肝实质不均质”的本质
Selected response from:

Edward LIU
Canada
Local time: 07:23
Grading comment
Thank you.
4 KudoZ points were awarded for this answer



Summary of answers provided
4实质回声不均
Edward LIU


  

Answers


1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5
about liver (实质回音不均质)
实质回声不均


Explanation:
实质回声不均

--------------------------------------------------
Note added at 3 hrs 56 mins (2005-04-06 06:03:36 GMT)
--------------------------------------------------

heterogeneous parenchyma echo

超声在介质中以直线传播,有良好的指向性。这是可以用超声对人体器官进行探测的基础。当超声传经两种声阻抗不同相邻介质的界面时其声阻抗差大于0.1%,而界面又明显大于波长,即大界面时,则发生反射,一部分声能在界面后方的相邻介质中产生折射,超声继续传播,遇到另一个界面再产生反射,直至声能耗竭。反射回来的超声为回声。声阻抗差越大,则反射越强,如果界面比波长小,即小界面时,则发生散射。超声在介质中传播还发生衰减,即振幅与强度减小。衰减与介质的衰减系数成正比,与距离平方成反比,还与介质的吸收及散射有关。超声还有多普勒应(Doppler effect),活动的界面对声源作相对运动可改变反射回声的回率。这种效应使超声能探查心脏活动和胎儿活动以及血流状态。

人体结构对超声而言是一个复杂的介质,各种器官与组织,包括病理组织有它特定的声阻抗和衰减特性。因而构成声阻抗上的差别和衰减上的差异。超声射入体内,由表面到深部,将经过不同声阻抗和不同衰减特性的器官与组织,从而产生不同的反射与衰减。这种不同的反射与衰减是构成超声图像的基础。将接收到的回声,根据回声强弱,用明暗不同的光点依次显示在影屏上,则可显出人体的断面超声图像。


--------------------------------------------------
Note added at 4 hrs 9 mins (2005-04-06 06:16:14 GMT)
--------------------------------------------------

肝内回声特点:正常肝实质呈中等或弱回声光点,其强度和频率皆均匀。
肝硬化时肝实质回声特点为:回声增粗、增强,可见斑块状强回声区;用适宜的增益条件扫描,看见多数低回声小结节镶嵌在肝实质内,前者由纤维化所致,后者系再生结节;随病变发展,出现肝结构紊乱、肝实质不均质改变,需要与弥漫性肝癌的声像图相鉴别。


--------------------------------------------------
Note added at 4 hrs 12 mins (2005-04-06 06:19:01 GMT)
--------------------------------------------------

“回声不均匀”的现象反映“肝实质不均质”的本质

Edward LIU
Canada
Local time: 07:23
Works in field
Native speaker of: Native in ChineseChinese
PRO pts in category: 65
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