The Role of Multislice Computed Tomography in Congenital Heart Diseases in Paediatric Age Group.

All patients will be subjected to the followings:

• All children gave an informed consent prior performing the research.

• Every child was submitted to full history taking.

• Clinical assessment of the patients will be performed in the form of: measuring of vital signs and anthropometric measurements.

• Renal function tests(ѕerum creatinine and blood urea).

• Patients will be prepared for CT as following:

• Calculation of amount of CM and sedations.

• The patient will be fasting for 4 hours.

• The peripheral venous line will placed usually in a right upper limb vein, exercise if cosurgical .

• The patients will be put in a supine position and at the middle of CT gantry.

• ECG leads will be put on the chest of the patient. Infants below 6 months will be laid with arms at their side or above their head for image acquisition, positioning the arms above their head is advised, while patients above 6 months of age were positioned with their arms above their head when possible.

• CT examination will be done by

• 160 MDCT Toshiba Machine or 128 MDCT GE machine or 160 MDCT Philips Machine:

• We used the following parameters during cardiac CT scanning:

• Pitch of 1.3, helical thickness of 0.5 mm and coverage of 32 cm.

• The radiation dose set to 80-100 kvp.

• Tube current from 10 to 40 mA/kg.

• The gantry rotation speed at 0.35-.4 sec.

• ECG gated Retrospective With MA modulation.

• Wide FOV.

• A scout will be taken and dual-phase injection conducted using non ionized contrast material. The total contrast volume is 1.5-3 ml/kg.

• Scanning begins when contrast filled the LV by bolus tracking.

• All images were transferred to workstation multiplanar reformation (MPR), maximum (MIP) and minimum (MinIP) intensity projections and volume rendering images will be performed for reporting.

• Reporting in sequential approach