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X线成像结构与原理

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-02-09 23:19
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-

2021年2月9日发(作者:银保)


promotion of empl


oyment, form a rea


sonable a


nd


orderly


pattern of i


ncome distri


buti


on,


bui


ld a more fair a


nd sustai


nable


social se


curity


systems, medi


cal and health system reform. T


he pl


enar


y, innovati


on of soci


al governance, must focus on the mainte


nance


of fundame


ntal interest


s of the


overwhelming majority of the


pe


ople, maximize fact


ors, e


nha


nce


social development, impr


oving soci


al governance, the i


nterests


of national se


curit


y, e


nsure t


hat the


people live a


nd w


ork, soci


al stabil


ity and


orde


r.


o improve social gover


nance, stimulati


ng social


organizati


on, i


nnovative and effective system of preventing


and resolvi


ng social


conflicts, impr


oving t


he publi


c se


curity system,


set up the


National Security Council


, national security systems and nati


onal


se


curity strategy to e


nsur


e national security.


Plenary


sessi


on, the


construction of ecologi


cal civ


ilization, you must esta


bli


sh systems


of ecol


ogical system, using the system to


protect t


he ecologi


cal e


nvironme


nt.


o improve natural


resour


ces asset property right system a


nd use control, red li


ne of delimitation of e


col


ogical


protecti


on, re


sources


paid


use system a


nd e


col


ogical


compensati


on sy


stem in ecologi


cal envir


onme


nt prote


ction management sy


stem reform. Plenary


sessi


on, ce


ntering on b


uilding a liste


ning party comma


nd, can wi


n and havi


ng a fine style of the pe


ople'


s army, a strong army under the


new sit


uation of the


party Goal


s, restricti


ng the


development of nati


ona


l defense and army buil


ding i


s solve


d outstanding


contra


dicti


ons a


nd


problems, i


nnovati


on a


nd


development of military the


ory, enhance milit


ary strategic guida


nce, improve t


he military strategy in the


new


period, building a modern military force system with


Chi


nese


chara


cteristics.


o dee


pen t


he adjustment of


personnel system reform in the army, military


poli


cy and system reform, prom


ote the development of military and civi


lian integration de


pth.


Plen


ary session


stresse


d that compre


hensive reform must be to


strengthen a


nd impr


ove the


party's leader


shi


p, give full play to the core r


ole of the


party commands t


he overall sit


uation and coordi


nating all parties, impr


oving the


party's leadi


ng water ...


Margin.


Challe


nged t


he leadershi


p of the Communi


st Party of Chi


na, Marxi


sm- Leni


nism and Mao Ze


dong thought by


Deng


Xiao


-pi


ng's fla


g, replace


d by thre


e representatives and the


harmonic societ


y.


The former Communist Party spirit and


social cohesi


on


poi


nt of almost all politica


l makeover.


Chara


cteristics


of socialism publi


c ow


nership is


shifting to


private ow


nership,


planned reg


ulation and market regulati


on, t


he pr


oletari


an regime controlle


d by the elite. Of univ


ersal equality, fairness a


nd


basi


c principl


es of distri


buti


on sy


stem is socialist societ


y, however after economic monopolize


d by powerful, ve


sted interest


s grow


employers


do


not have t


he same status, har


dly se


ems fair socia


l distri


buti


on.


State key protection


of capital i


nterests rather tha


n the i


nterests of citizens, had


bee


n hits the bott


om of the prol


etariat


CT


的结构



常规


CT


的基本结构





CT的主要结构包括两大部分:< /p>


X


线体层扫描装置和计算机系统。前者主要由产生


X


线


束的发生器和球管,


以及 接收和检测


X


线的探测器组成;


后者主 要包括数据采集系统、


中央


处理系统、


磁带机、


操作台等。


此外,


CT机还应 包括图像显示器、


多幅照相机等辅助设备。






X线球 管和探测器分别安装在被扫描组织的两侧,


方向相对。


当球管产 生的X线穿过被


扫描组织,透过组织的剩余射线为探测器所接收。探测器对X线高度敏感 ,它将接收到的


X


线先变成模拟信号,


再变换为数字信号,


输入计算机的中央处理系统。


处理后的结果 送入磁


带机储存,或经数


/


模处理后经 显示器显示出来,变成CT图像,再由多幅照相机摄片以供


诊断。




螺旋


CT





螺旋< /p>


CT


机是目前世界上最先进的


CT


设备之一,


其扫描速度快,


分辨率高,


图像质量优。


用快速螺旋扫描能在


15


秒左右检查完一个部位,能发现小于几毫米的病变,如小肝癌、垂


体微 腺瘤及小动脉瘤等。


其功能全面,能进行全身各部检查,


可行多 种三维成像,


如多层面


重建、


CT


血管造影、器官表面重建及仿真肠道、气管、血管内窥镜检查。可进行实时透镜


下的


CT


导引穿刺活检,使用快捷、方便、准确。< /p>




















常规


CT


的基本结构






CT的主要结构包括两大部分:< /p>


X


线体层扫描装置和计算机系统。前者主要由产生


X


线


束的发生器和球管,


以及 接收和检测


X


线的探测器组成;


后者主 要包括数据采集系统、


中央


处理系统、


磁带机、


操作台等。


此外,


CT机还应 包括图像显示器、


多幅照相机等辅助设备。






X线球 管和探测器分别安装在被扫描组织的两侧,


方向相对。


当球管产 生的X线穿过被


扫描组织,透过组织的剩余射线为探测器所接收。探测器对X线高度敏感 ,它将接收到的


X


线先变成模拟信号,


再变换为数字信号,


输入计算机的中央处理系统。


处理后的结果 送入磁


带机储存,或经数


/


模处理后经 显示器显示出来,变成CT图像,再由多幅照相机摄片以供


诊断。




螺旋


CT





螺旋< /p>


CT


机是目前世界上最先进的


CT


设备之一,


其扫描速度快,


分辨率高,


图像质量优。


用快速螺旋扫描能在


15


秒左右检查完一个部位,能发现小于几毫米的病变,如小肝癌、垂


体微 腺瘤及小动脉瘤等。


其功能全面,能进行全身各部检查,


可行多 种三维成像,


如多层面


重建、


CT


血管造影、器官表面重建及仿真肠道、气管、血管内窥镜检查。可进行实时透镜


下的


CT


导引穿刺活检,使用快捷、方便、准确。< /p>




















螺旋


CT


的具体用途与特点(部分)






.


肝动脉


CT


血管造影示肝内血管,指导肝癌介入治疗。





.


头颅扫描的图像清晰,无伪影。在发现后颅凹病变上优于其他

CT







.


胸部< /p>


CT


扫描图像清晰度明显高于其他


CT< /p>







.


肝、胆、胰、脾及腹膜后


CT


扫描,检查快,图像质量好。






.


肾脏、盆腔及腰椎


CT


扫描检查快,图像质 量好。






.


显示颅内肿瘤于血管的关系对手术至关紧要。





< br>.


一般


CT


或超声不能发现的微 小肝癌,在螺旋


CT


动脉增强扫描下原形毕露。





.


周围型肺癌和肾上腺肿瘤表面三维重建示肿瘤与血管的关系,有利于手术。




CT


的工作原理






人体各 种组织(包括正常和异常组织)对X线的吸收不等。CT即利用这一特性,


将人


体某一选定层面分成许多立方体小块,


这些立方体小块称为体素。


X线通过人体测得每一体


bvi


ousl


y, face


Chi


na's Socialist sy


stem, the Communi


st Party is not the


party.


In that


case,


politi


cal chaos ha


s bee


n very tight. Is remodeling


or reconstr


ucti


on, i


s a correction or a


stove.


Whet


her to tur


n right


or left, is ba


ck to the source


or put forward


new political i


deas.


This is to determine the r


oad pr


obl


ems in China, is al


so the key out


of the de


ep water


of the reform of the e


conomic sy


stem.


After 18, the new Ce


ntral coll


ective lea


dership attaches great importance to


politi


cal orie


ntation.


First, the


cles


ng point, starti


ng from the Ce


ntral


Governme


nt's self


-re


straint, whi


ch


prea


ches a


nd


pro-image, br


oug


ht fresh feeling to t


he communit


y.


Secondly,


before reform and openi


ng up and reform and openi


ng two


periods after non-negative,


untyi


ng the tangl


e of the soci


ety a long time on t


his issue. Third, a ne


w generation of part


y leaders on various


occasions to


Mao Ze


-Dong a


nd Ma


o Ze


-Dong's thoug


ht of evaluati


on has room for manoe


uvre,


throug


h to the r


uling i


deol


ogy of Ma


o Zedong thought, i


s the


call of the soul t


o the S


ocialist Revol


ution and constr


ucti


on. Em


pty talks jeopardize


national interest


s and try again, is a


n affirmation of De


ng Xia


o-ping's reform i


deas.


These strong politica


l signal


showing a


new ge


neration


of poli


tical leader


s is still kee


ping to t


he Socialist roa


d.


Four is revisiting t


he


o Ze-Dong's hi


storical


cycle


of


ofile anti


-corrupti


on a


nd t


he importa


nce


of the Constit


ution, reorga


nization is ba


d style of official


dom, wa


s to civ


ilize people obey the la


w, w


hile impr


oving the col


or change of the regime of vigila


nce.


Five is to reform into dee


per waters a


nd stressed t


hat top


-level


design, this i


s a review on the reform and openi


ng up in t


he past, i


s also look


ing for a way out.


Six foreign and Russia cl


oser, the flexibl


e attitude


on the issue of the


Korea


n pe


ninsula


, Sino


-Japane


se fishi


ng har


dli


ne China


on the island out of the


nt


ow pr


ofile sha


dow bega


n to gradua


lly pla


n


development. Signs show that t


he new l


eadership


began t


o make a left turn in politics.


However, as of right now, not only ide


ologi


cal confusi


on i


n the


community, the new lea


dership's t


hinki


ng is messy. Ne


w leader


s bot


h stresse


d the


need t


o implement t


he Constituti


on, stresse


d the need t


o turn off the


power i


n a cage. Al


so stre


sses that Mao Zedong t


hought ca


nnot be lost, 30 years after the reform and openi


ng up 30 years ago


can


not deny each ot


her.


Bot


h advocate dem


ocracy a


nd rele


ase


n does not speak


of


files of politi


cal constraint


s. Neit


her de


ny the


history of the


CPC Central Committee on several issues ...


Comrades: today


brings t


ogether member


s, mainly in


order to


provi


de a platform to Exchange a


nd lear


n from each


other i


n order t


o facilitate our work. Just now, we focus


on taxation, pla


nni


ng and stabilit


y, safety,


proje


ct constr


uction, typi


cal topics


such as


private facts prese


ntation and interacti


on, and towns currently exist in the in


-de


pth a


nalysis


of the problems to


be solved, to ex


plore


new methods t


o solve t


he pr


oblem. It


can


be sai


d that summing


up t


he achievement,


no grandstanding


; analy


sis

-


-


-


-


-


-


-


-



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