Hi Linh,
Personally I like the first image you provided.
Your calliper placement on all images is as I would do them including the % coverage measurements.
I just think your first coronal image is a better scan plane than your second effort.
As far as calliper placement goes I do what you do and that is to put the baseline flat on the ilium. At the point where the ilium dives away from the baseline that is the “intersection point” where I put my inclination line and then line it up against the acetabular roof as you have done.
So I am happy with the first image.
This is a very dysplastic hip requiring an orthopaedic opinion and treatment.
Nice scan Linh.
Steve