5. MESENTERIC CTA (R/O Intestinal Ischemia)

KV / effective mAs / rotation time	120 / 200 / 0.5 seconds
Detector collimation	0.75 mm
Slice Thickness	1.0 mm
Pitch	0.75
Kernel (for initial reconstruction)	B30f
Increment	1.0 mm
Image order	Cranial to caudal
Oral Contrast	Water 250 cc every 30 min for total of 750 cc + 250 on table. (If emergent can give 750 cc H20 30 minutes prior + 250 on table)
Intravenous Contrast	Isovue 300 - 120 cc. 18 - 22 ga IV needed preferably in the AC.
Injection Rate	3.5 - 4 cc second
Scan Delay	FIRST acquisition 30 - 35 seconds approximately. MUST USE CARE BOLUS. Place ROI on descending Aorta at level of the diaphragm. SECOND acquisition 70 second delay.
Reconstruction	First acquisition reconstruction 1 x 1. First acquisition 2nd Recon and second acquisition B30f 3 x 3.
Additional Instructions	Scan abdomen and pelvis. Perform thin MIP reformatting using 3D card: Image thickness 3, Distance between images 1, Number of slices 80 or whatever is needed to cover from anterior vertebral body to abdominal wall at L-2 level.

Clinical