Intensifying Screens : Selection & Application Guide Type Speed Class Extremities Joints Chest Skull Stomach / Intestines Lumbar Vertebrae Urogenital Organ Rare Earth Green Green 100 100 Green 200 200 Green 400 400 Green 800 800 Rare Earth Blue Blue 200 200 Blue 400 400 Blue 800 800 Calcium Tungstate Medium 100 Hi Speed 150 Hi Plus 200