CT ANGIOGRAPHY CT IMAGE OF THE BLOOD VESSEL OPACIFIED BY CONTRAST REQUIREMENTS FOR CTA • PATIENT PREPARATION • ACQUSITION PARAMETERS • CONTRAST MEDIUM ADMINISTRATION • POSTPROCESSING TECHNIQUES PATIENT PREP INFORMED CONSENT                                            PATIENT PREP • • • • BUN 7-20 mg/dl CREAT.- 0.6 –1.2 mg/dl IODINE ALLERGY- STEROID THERAPY HYPERVENTILATION BEFORE EXAM FOR BETTER BREATHOLD UTILIZED GAUGE SUITABLE FOR CTA 18 OR 20 CARDIAC ANGIOGRAM CALCIUM SCORING 3-D VISUALIZATION TOOLS IN CTA • • • • • MPR MIP SSD VR CINE CARDIAC ANGIOGRAM CTA - MPR PLANE? MPR PLANE? MIP - CTA                                                              SSD -CTA VR - CTA CINE CTA MPR • SIMPLE • FAST • ANY PLANE VISUALIZATION • LESS USEFUL IN COMPLEX VESSEL VISUALIZATION SSD • FAST • LITTLE EDITING • LITTLE AXIAL DATA USAGE • CONTOUR , RELATIONSHIP OF VESSELS • ARTIFACT GENERATION • INACCURATE MIP • CALCIFICATION DETECTION • THROMBUS DETECTION • AILIASING ARTIFACT • EDITING REQUIRED VR • ACCURATE • ALL DATA USED • GOOD STENOSIS DETECTION • COMPLEX COMPUTER PROCESSING (PAST) STEREOSCOPIC VIEWING ... BREATHOLD UTILIZED GAUGE SUITABLE FOR CTA 18 OR 20 CONTRAST ADMINISTERED WITH POWER INJECTOR ACQUSITION PARAMETERS PARAMETERS • USUALLY ROUTINE CT PRECEDES A CTA EXAM THE ROUTINE EXAM IS USED AS... DETERMING THE SCANNING RANGE IN CTA SLICE THICKNESS • SLICE THICKNESS • SPATIAL RESOLUTION SLICE THICKNESS • CEREBRAL CTA • 1MM (LOWER mA) • ABDOMINAL CTA • 3MM • THORACIC CTA • 3MM SPIRAL PITCH •... SIMILAR TO NON- CTA EXAM OF THE SAME BODY PART RECONSTRUCTION INTERVAL • 50% OF OVERLAP UTILIZE SUBSECOND SCANNING • INCREASED TISSUE VOLUME COVERAGE • REDUCTION IN MOTION ARTIFACT CONTRAST ADMINISTRATION