 So the use of color Doppler again as I said it is a good habit to be well versed with the color imaging where it will be useful is you know systemic and pulmonary veins to see the flow across the AV valves and ventricular septum especially if there is a VSD or muscular VSD semilunar valves and ductile and the aortic arch. So this is typically the two inflows and the two outflows you can in fact in you know once we you can you know literally see everything these are the two inflows and then as you start coming towards the outflow this is the LVOT which is there in the center of the heart it is carrying blood away from the heart so it is seen in that blue color away from the transducer and then there will be the RVOT which is the bifurcation is seen then you come to a three vessel trachea view the SVC, the aorta and the pulmonary in fact you are seeing the zygus you know joining the SVC you can see it even in a 2D image here and you know you don't really need anything else to say that this heart is normal so the two inflows the LVOT, the RVOT, the three vessel trachea view and these are the arch views in the aortic arch view most of the times you can see the IVC coming into the right atrium so these are the color pictures and you know we have the habit of taking one 2D image and simultaneously showing one color image in all our routine anomaly scans at 18 to 20 weeks and it has helped us a lot of course the pulmonary veins mandatory to show only two pulmonary veins but with again good machines and you know a power Doppler bi-directional power Doppler reducing the scale making your box a little smaller in size it will really show you all the pulmonary veins beautifully this is the one set of pulmonary veins and here you can see here only one it's seen in this view but if you you know adjust your transducer you will be able to see both and then this is you know a three vessel view I have lowered the PRF to see the flow coming in the SVC there we also include the ARSA I mean the normal right subclavian view in this and we try in that section automatically you tend to see the left brachiocephalic but again these are not the mandatory pictures and this is how you will see the arch views the aortic arch and the ductile arch the highest arch is the aortic arch and then there is this ductile arch which is seen little below that if you observe both are seen in this view this is the aortic arch which is little superior and this is the one which is going behind below that is the the ductile arch so pulse Doppler you know again good practice point to get used to the scan where to place the sample width and how to scan so you have to place the sample volume distal to the target and while keep insulating angle at less than 20 degrees from the direction of flow whenever there is any pathology say there is a regurgitation you have to place the sample volume at the brightest color so you get the maximum gradient or maximum velocity you have to obtain Doppler waveforms during fetal apnea not so much of a problem at 20 weeks but at 20 weeks the fetus is moving sometimes so this is where you will put your spectral sample if you are insulating tricuspid valve what is the distal to the valve is the flow direction is like this from the atria to the ventricles so the distal is here if you are insulating pulmonary valve what is the distal the flow is across the ventricles to the great arteries so what is distal it is here so this is how you will keep insulating the angles and typically the inflows have this e and a waves and the outflows have any arterial kind of a spectral pattern