What method can a physician use to evaluate the status of a patient’s body composition?

BMI or Body mass index could be one method a physician can use to evaluate the status of a patient's body composition. It can be defined as the body mass divided by the square of the body height. This way, the physician can tell if the patient is normal, underweight, or overweight. 

Difference between normal and abnormal tissue is much clearer on mri than on ct and mri much suitable to view soft tissues

Awould be the most dangerous