Heart CT Size Overview

Summary

NOTES SCALES AND MUSIC
At the level of the mitral valve which is also about mid septum, the chambers are relatively all best visualised. This is a place where approximate size can be evaluated

LA +/- 4cms (post wall to MV)

NORMAL LINEAR DIMENSION OF THE LA ON A GATED CT SCAN
The aorta is a reference structure and is usually about the same size or smaller. In this instance it is 3.5cms.

RA +/- 5cms (post wall to TV)

NORMAL LINEAR DIMENSION OF THE RIGHT ATRIUM ON A GATED CT SCAN
(normal up to about 5cms)

RV +/- 4cms (transverse) not >6

NORMAL LINEAR DIMENSION OF THE RIGHT VENTRICULAR CAVITY ON A GATED CT SCAN
(normal up to about 4-5cms)

LV +/- 5cms (transverse) not >6

NORMAL LINEAR DIMENSION OF THE LEFT VENTRICULAR CAVITY ON A GATED CT SCAN
(normal up to about 5-5.5cms)

LV Thickness in Mid Septal Region

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1.2

NORMAL THICKNESS OF THE LV SEPTUM AND FREE WALL ON A GATED CT SCAN
Axial images through the left ventricle (LV) in mid septal region at the level of the opened mitral valve (early diastole) shows a septal thickness of 8.8mms and free wall thickness of 9mms (normal up to about 12mms)
Ashley Davidoff MD

Volume Assessment of the Cavities (Rule of Thirds)

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RA = LA = 1/3 ventricles

RV = 2/3 LV

NORMAL VOLUME EVALUATION OF THE ATRIA AND VENTRICULAR CAVITIES ON A GATED CT SCAN
Axial images through the 4 chambers at the level of the A-V valves during diastole (mitral valve open) enables an approximate volume evaluation of the chambers. The atria are approximately the same volumes, and are about 1/3 the volume of the ventricles. The right ventricle (RV) is about 2/3 the volume of the left ventricle (LV)
Ashley Davidoff MD

PA/Ao

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3/3.5

NORMAL LINEAR DIMENSION OF THE MPA AND AORTA ON A GATED CT SCAN
Axial images through the main pulmonary artery (MPA) and proximal ascending aorta (Ao) shows a MPA measurement of 2.5cms (normal up to 3cms) and referenced to the aorta usually about the same size or
Ashley Davidoff MD

Volumes in Systole and Diastole