ct anatomy of the heart - nasci.org - makaryus - ct... · of a cardiac ct exam an understanding for...
TRANSCRIPT
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Cardiac Anatomy Assessed by Examining the Important Components
of a Cardiac CT ExamAn Understanding for Ideal Image Acquistion
and Interpretation
Amgad N. Makaryus, MD FACCDirector of Cardiac CT and MRINorth Shore University Hospital
New York
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Cardiac AnatomySYSTEMATIC APPROACH
• Structure and Function Based approach• Relating imaging planes for ideal structure
visualization: axial oblique 3D-reconstruction• Appreciation for structure function • Pericardium Right Heart Left Heart Heart
Valves Coronary Arteries Great Vessels
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Can be obtained from one important short
axis view
VLA (2C)
4C
HLA(3C)
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Three Important Views
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PERICARDIUM• The heart is contained within the pericardial sac. • Visceral pericardium is adherent to the ventricular
myocardium, and cannot be visually separated from the epicardial fat.
• Parietal pericardium may be identified as a paper-thin high signal intensity surface surrounding the heart and great arteries
• FUNCTION: restricts excessive movements and provides a lubricated sac containing pericardial fluid
• Visualization of the parietal pericardium depends upon the presence and extent of low-density fatty deposition in the pericardial fat pad and middle mediastinum.
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PericardiumPericardium, Axial Section
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Pericardium, Straight Sagittal Section
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RIGHT HEART• Deoxygenated blood drains back to the right heart
from the body through the SVC and IVC as well as the cardiac veins (coronary sinus into the right atrium).
• Right Atrium: round in shape, and forms the right lower border of the heart.
• Right atrial appendage is a broad-based, triangular structure, contained within the pericardium, which extends from about the middle of the heart obliquely around the ascending aorta.
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• The tricuspid valve is contained within the anterior atrioventricular ring between the RA and RV.
• Right Ventricle: resides immediately posterior to the sternum. The right ventricular surface of the interventricularseptum is irregular. The septomarginal trabeculation has papillary muscles extending from it to the tricuspid valve leaflets. The inferior-most of the septomarginaltrabeculation is the moderator band, which carries the conducting system right bundle fibers.
• Pulmonary valve lies slightly out of the axial plane, so may appear elongated in conventional axial acquisition. The caliber of the main pulmonary artery should be about the caliber of the ascending aorta at this anatomic level.
RIGHT HEART
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SVCRight Heart, SVC, Axial Section
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Right Heart, Right Atrium, RAO Section
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Right Heart, RV, Axial Section
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vRight Heart, RV, RAO Section
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LV
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• Pulmonary Veins: return oxygenated blood from the lungs to the left atrium. Generally 2 upper and 2 lower veins.
• Left Atrium: The left atrium lies posterior, superior, and toward the left with respect to the right atrium. The left atrial appendage is long and finger-like. The LAA runs around the left aspect of the heart, below the level of the pulmonary valve.
• The mitral valve lies within the posterior atrioventricular ring, immediately subjacent to the circumflex coronary artery. Fibrous continuity between the anterior mitral leaflet and the aortic annulus is characteristically found in morphologic left ventricles.
LEFT HEART
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• Left Ventricle: the shape of a prolate-ellipse. The left ventricle lies posterior and to the left with respect to the RV.The LV is characterized by its smooth walls and two large papillary muscles.
• The aortic valve has three sinuses of Valsalva, the right (anterior), the left (posterior), and the non-coronary (right posterior).
• The aortic arch lies almost entirely behind the manubriumof the sternum. It is not contained within the pericardium. The origins of the three major aortic branches, the innominate, left common carotid, and left subclavianarteries, are slightly ventral to the vertex of the arch.
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LEFT HEART
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Left HeartLeft Heart, Pulmonary Veins and Left Atrium, Axial Section
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Left Heart, LV,RAO Section
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Left Heart, LV, Oblique Axial Section
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Left Heart, LV,Short Axis Section
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LV Volumes and Ejection FractionEndEnd--Diastolic Volume Diastolic Volume (EDV)(EDV)EndEnd--Systolic Volume Systolic Volume (ESV)(ESV)Stroke Volume Stroke Volume (SV = EDV (SV = EDV -- ESV)ESV)Ejection Fraction Ejection Fraction (EF = SV / EDV)(EF = SV / EDV)Cardiac Output Cardiac Output (CO = SV * Heart Rate)(CO = SV * Heart Rate)LV Mass= (Spec. LV Mass= (Spec. GravGrav.) *(.) *(EpicardalEpicardal Volume Volume –– EndocardialEndocardial Volume)Volume)
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Coronary Arteries• Supply oxygenated blood to the heart. • The RCA originates from the right aortic sinus of Valsalva.
It runs in the anterior AV ring. The RCA originates more caudally from the aorta than the LMCA.
• The PDA originates from the RCA and perfuses the inferior interventricular septum, In 85% of individuals, the PDA arises from the distal RCA; this is called a right dominantcirculation. The PDA may also derive from the LCX forming a left dominant circulation or there may be “co-dominance” with derivation of the PDA from the RCA and LCX.
• The highest marginal branch from the RCA is the conusartery which supplies the RVOT.
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• The LMCA arises from the left aortic sinus of Valsalva. It continues posteriorly, and passes beneath the left atrial appendage, to enter the posterior AV ring. It continues within the ring as the circumflex artery.
• Before the LMCA passes beneath the LAA, the anterior descending artery arises along the top of the interventricular septum. Within the epicardialfat, it passes along the top of the septum in the interventricular groove.
Coronary Arteries
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RCA, RAO Projection
Coronary Angiography
Invasive and CTMakaryus 2009
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LCA, LAO Projection
Coronary Angiography
Invasive and CT Makaryus 2009
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vRCA, Axial Section
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vRCA, Oblique View
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RCA, RAO Section
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RCA, Coronal Section
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vLCA, Axial Section
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vLCA, RAO Section
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LAD, Oblique 4 Chamber View
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LCA,Coronal Section
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vLCA, Short Axis Section
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Curved Multiplanar Reformats
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Summary
• Knowledge of normal anatomy will allow for ideal imaging planes and sections.
• Knowledge of normal anatomy will allow for the identification of pathology and proper CT scan interpretation.
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