胸部正常CT断层解剖图片.ppt

目 录 概论 纵隔窗的CT解剖 肺窗的CT解剖 胸部正常CT解剖 纵隔窗 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 胸部正常CT解剖 肺窗 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： 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） What is the structure in blue? (click to highlight) This is the Superior Vena cava Can you find the azygous arch ? (where the azygous vein comes across to dump into the SVC) (click for answer) Notice the bifurcation of the trachea (corina) at this level (click to highlight) What is the structure in red? (click to highlight) This is the left pulmonary artery. Can you find the pulmonary trunk and right pulmonary artery? (click for answer) Where are the ascending (A) and descending (D) limbs of the thoracic aorta? (click to highlight) A D We 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) Can you find the left main coronary artery coming off the aorta? (click for answer) You can further see The left coronary branch into the Circumflex artery and the LAD artery (click to highlight) Here is a good image of the aortic semi-lunar valve leaflets. Can you find them? (click for answer) Here is a good image of the left atrium dumping Into the left ventricle. Can you find it? (click to highlight) You can clearly see the left ventricular wall and septum with the projecting papillary wall muscles attaching to the mitral valve leaflets. (click to highlight) Contrast filling th