Introduction to CT scan and MRI


Transthoracic echocardiography is the firstline imaging modality for diagnosis and follow-up of patients with congenital heart defects due to its low cost, widespread availability, portability, ease of use, and excellent temporal-spatial resolution, reducing the need for diagnostic cardiac catheterization and angiography in most patients. However, the diagnostic utility of echocardiography markedly diminishes with the growth of the patients and after surgical procedures through median sternotomy because acoustic windows become progressively more limited. Moreover extracardiac structures, such as the great arteries and great veins, complex intracardiac connections or surgically implanted conduits or baffles deeply located in the chest or behind the sternum, may also be difficult to resolve by ultrasound. Diagnostic cardiac catheterization carries risk of complications because it is invasive and is associated with radiation exposure; furthermore as a projection technique, it is limited in providing accurate anatomical information.


Congenital Heart Disease Cardiovascular Magnetic Resonance Congenital Heart Defect Magn Reson Image Compute Tomography 
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