1- Heart is the 1st clear object to know as it is predominates to the left.
2- Rhight hemidiaphram is higher than the left one.
3- Gastric fundal air shadow on the left.
4- Left hilum normally higher than right.
5- Aortic knuckle must be at the left ( some patients have a right-sided arch,but you can find it by checking).
6- Horizontal fissure on the right.
