Objective To compare the imaging quality and the anatomic detail in thoracolumbar spine of amorphous selenium flat-panel detector digital radiography(DR) system and computed radiography(CR) system.

To study factors influencing DSA image quality in gastrointestinal hemorrhage;

Effect of increase in thickness of additional Al filtration on X-ray image quality and patient doses;

Image quality evaluation system for coronary magnetic resonance angiography;

On the picture quality of High Definition Television and Cinematography;

To deal with the problem that Shanghai digital TV picture quality is poorer than traditional cable TV,picture qualities of several broadcasting taches are messured objectively.

By the comparison of picture patterns,this thesis states the affect of data solution to the picture quality so as to avoid the fall-down of picture quality during the period of pattern changes.