胸部正常CT解剖

nullnull胸部正常CT解剖长沙医学院: 吴龙目 录目 录概论 纵隔窗的CT解剖 肺窗的CT解剖 null 前 言 肺、纵隔内部组织结构之间、正常结构与病变之间的密度差异 CT满意显示胸部正常结构和病灶的大体解剖，定位、定量准确，为定性分析提供形态学基础null有关胸部CT检查技术的几个问题 1、CT值与窗宽、窗位：肺窗和纵膈窗，双 窗技术 2、层厚和层距：吸气末扫描，薄层/重叠扫 描；减小部分容积效应、肺血坠积现象 3、平扫和增强扫描：LN，病灶，血管 4、高分辨CT（High Resolution ,HRCT） 层厚 1～2mm，显示次级肺小叶结构； 显示间质性病变、支扩、孤立小病灶 nullnullnullnullnullnullnullnull胸部正常CT解剖胸部正常CT解剖纵隔窗null 一、 主要观察内容 1、纵膈：有无纵膈肿块、多余结构 LN有无肿大或/及增多 “三管”结构形态（气道结合肺窗） 2、较大范围的肺、胸膜（腔）病变的内部 结构 3、阅片顺序： 辨认每一层纵膈内的“三管”结构 自上而下、由近段向远段 完整观察某一结构主要层面和结构主要层面和结构主动脉弓及其以上层面：辨认头臂血管 主-肺动脉窗层面：窗空虚/潜在，气管分叉，奇V弓 右上叶支气管层面：左PA弓、右上PV前干，右上PA，上腔V 左上叶支气管层面：右中间段支气管，右PA，右下PA，左上PV，左PA降支 其他肺门层面：两侧大小基本对称（肺窗显示更佳），相伴随的支气管和PA分支，由近向远渐小nullnullnullnullnullCan you find the right and left subclavian arteries? (click for answer)nullThe right subclavian artery as it dumps into the brachiocephalic artery. (click to highlight)nullWhat are the 3 yellow air-filled (black) structures highlighted here? (click to highlight)nullThis is contrast (white) being injected into the left subclavian vein.nullCan you find the first 3 branches off the aortic arch? (click for answer)nullIncidental lipoma (‘fat tumor’) (notice it is the same density as fat in the chest wall) nullnullnullCan you find the left brachiocephalic vein as it dumps into the SVC? (click for answer)nullWe are at the level of the top of the aortic arch (click to highlight)nullCan you find the right pectoralis major and minor? (click for answer)nullWhat is the structure in blue? (click to highlight)This is the Superior Vena cavanullnullnullCan you find the azygous arch ? (where the azygous vein comes across to dump into the SVC) (click for answer)nullnullNotice the bifurcation of the trachea (corina) at this level (click to highlight)nullnullWhat is the structure in red? (click to highlight)This is the left pulmonary artery.nullnullnullnullCan you find the pulmonary trunk and right pulmonary artery? (click for answer)nullWhere are the ascending (A) and descending (D) limbs of the thoracic aorta? (click to highlight)nullnullWe are at the level of the top of the left atrium. Notice The pulmonary veins dumping into it as they return from the lungs. (click to highlight)nullCan you find the left main coronary artery coming off the aorta? (click for answer)nullYou can further see The left coronary branch into the Circumflex artery and the LAD artery (click to highlight)nullnullHere is a good image of the aortic semi-lunar valve leaflets. Can you find them? (click for answer)nullHere is a good image of the left atrium dumping Into the left ventricle. Can you find it? (click to highlight)nullYou can clearly see the left ventricular wall and septum with the projecting papillary wall muscles attaching to the mitral valve leaflets. (click to highlight)nullContrast filling the right ventriclenullCan you find the pericardial sac here? (click for answer) It is relatively easy to see because there is a fat layer around the heart and around the pericardium making the soft tissue more visiblenull纵膈的分区 方法 快递客服问题件处理详细方法山木方法pdf计算方法pdf华与华方法下载八字理论方法下载 ：CT较平片 （侧位）直接显示 前纵膈 --- 心脏、大血管前 间隙，胸腺 中纵膈 --- “三管”结构及其 周围间隙、LN 后纵膈 --- 脊柱旁（沟）； 脊神经、植物神经 心脏和心包 nullnullnullnullnullnull胸部正常CT解剖胸部正常CT解剖肺窗null一、主要观察内容 1、CT肺门（肺野内带）：第一、二肺门之间的血 管、支气管等 内侧 --- 与纵膈内支气管、血管相续（结合纵膈窗） 外侧 --- 段支气管开口处，与外周支气管血管束相续 2、支气管血管束（肺野中带） 由肺门发出的、相伴行的支气管和肺A分支； 向肺门/左房回流的、无支气管伴行的肺静脉 3、外周肺（胸膜下区）：段以下的血管、支气管断面 影，呈小条、星、叉、点状 4、阅片要点：抓住重点层面， 观察每一层时，注意上下相邻层面， 完整观察某一结构null二、主要层面和结构 标志：与肺门相续的支气管、血管 1、右上叶支气管以上层面： 两侧尖段支气管及其外侧的同名动脉 2、右上叶支气管层面：右主支气管，前、后段支气管， 右PA上干；右上PV前干 左上前段支气管 3、右中间段支气管层面：叶间动脉（右下PA 干） 4、左上叶支气管层面：左主、左上叶支气管 5、右中叶、左舌叶，两侧下叶背段气管开口层面： 中叶脊，左下肺A 以下层面：基底段支气管和PA分支，两侧基本对称； 近水平走向的双下PV，由近向远渐小 几个注意点：null 肺叶、肺段的判断 肺门邻近----叶、段支气管 外周肺----叶间胸膜（裂） 细线状 稍高密度带状 乏血管带（区）nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull