212COMPARISON BETWEEN COMPUTER TOMOGRAPHY AND 3D ROTATIONAL ANGIOGRAPHY OF LEFT ATRIUM BEFORE ANGIOGRAPHY OF LEFT ATRIUM BEFORE ATRIAL FIBRILLATIONUse of the final images in support of RFA is identical for both the CT and cardiac rotational angiography–support of creation of nonfluoroscopic 3D electro anatomic maps, direct fusion/integration with 3D electro anatomical mapping system, and/or direct fusion/ integration of a 3D model with live fluoroscopy. 3D Rotational Angiography (3DRA) represents a new alternative to CT cardiac imaging. Images created by the rotational angiography of the heart are fully comparable with CT images. 234 patients who have been referred for catheter ablation with complex atrial arrhythmias have been choose for the present retrospective study. Arithmetic mean and continuous variables with standard deviation and deviation presented in terms of % of the patients. Wilcoxon signed rank test or the one-sample t-test was used based on the field of requirement. Results with P-value and 0.05 accuracy have been considered as statistically significant. C-arm was isocentrically rotated over 240° after opacification of left atrium and pulmonary veins. Arms along the body and normal breathing, is the normal procedure of the patients during the procedure. With an X-ray acquisition speed of 30 frames per second, the 240° included 120° right anterior oblique to 120° left anterior oblique, over 4.1 secondsdrgurubhaimdrd@gmail.comResearch922019Atrial Fibrillation,Hypertension,Catheter Ablation,Paroxysmal Atrial Fibrillation,CT Scan,3DRA ScanningDr.N.Guru sreedharAssistant Professor, Dept. of Radiology, S.V.Medical College, Tirupati, Andhra Pradesh, India.