CT — Aortă abdominală (MCB)

Updated 04/27/24 CTA Abdominal Aorta (Abdomen/Pelvis) Reviewed 05/14/25 Indications - chest pain, aneurysm, dissection, aneurysm repair including open repair and endograft. Bill under CT Angio Combo AP w/ and w/o Contrast Charge. GENERAL SCAN NOTES Move the patient's arms over his/her head if possible. Remove any metal from the imaging field of view. Topogram - lung bases through pubic symphysis (obtained during end inspiration). Craniocaudal scan coverage - lung bases through pubic symphysis on all phases (obtained during end inspiration). Only do a delayed phase if there is a stent/endograft in the aorta. Adjust FOV (field of view) on topogram to smallest without cropping anatomy. IV Contrast: Administer weight-based Omnipaque-350 - 1 mL/kg up to 150 mL (100 mL minimum). Inject at 4 mL/sec followed by 40 mL saline flush, 20-gauge or larger in forearm or more proximal. Bolus track off proximal abdominal aorta triggered at 100 HU. Oral Contrast: generally not given for this protocol. For GE scanners, it is essential for the 1st recon thickness on the scanner to match the 1st recon thickness in this protocol book for the prescribed Noise Index to be valid. The 1st recon should generally be the thickest recon in the protocol.

CTA Abdominal Aorta (Abdomen/Pelvis) SIEMENS PARAMETERS & RECONS For the Pre Contrast, Angio and Delay (5 mins) phases: Scan
Care
Scan
kV mAs Care
Mode Dose Pitch Acq Coll Rot kV & Lvl Time Time Sensation 16 spiral 120 150 on 1.15 16 0.75 NA 0.5 18.1 Go Up 32 spiral 110 92 on 1.50 32 0.7 0.8 11.9 on 115 Sensation 64 spiral 120 150 on 1.20 64 0.6 NA 0.5 10.9 Definition 64 spiral 120 120 on 1.40 64 0.6 0.5 9.3 on Go Top 64 spiral 100 101 on 1.50 64 0.6 on 115 0.33 2.9 Drive 128 spiral 120 84 on 1.20 128 0.6 0.5 5.4 on Force 192 spiral 110 90 on 1.20 192 0.6 on 0.5 3.6 PRE CONTRAST IR
Name of Series Thick Interval Window Recon
Kernel Lvl Anatomy AX PRE 3.0 3.0 mediastinum head/feet Br40 / B41f 3 ANGIO PHASE AX ANGIO 3.0 3.0 mediastinum AX ANGIO THINS 1.0 1.0 mediastinum Br40 / B41f Br40 / B41f head/feet head/feet COR ANGIO 3.0 3.0 mediastinum front/back Br40 / B41f Br40 / B41f SAG ANGIO 3.0 3.0 mediastinum left/right 3 3 3 3 3D VRT (spin) 0.75 0.5 CT angio Bv36 / B31f DELAY PHASE (5 mins) AX DELAY 3.0 3.0 mediastinum head/feet Br40 / B41f 3

CTA Abdominal Aorta (Abdomen/Pelvis) GE PARAMETERS & RECONS For the Pre Contrast, Angio and Delay (5 mins) phases: Scan
Smart
Slice
Beam
Dose
Type SFOV kV mA
Range Noise
Index mA Thick Coll Pitch Speed Rot
Time Red ASIR Scan
Time LS 16 helical large 120 100-440 16.36 20 1.375 27.50 0.5 on 2.5 NA NA 9.1 Opt 540 helical large 120 100-440 16.36 on 2.5 20 1.375 27.50 0.5 NA NA 9.1 LS VCT 64 helical large body 40 120 100-700 14.14 on 2.5 1.375 55.00 0.5 50 50 4.5 Disc VCT 64 helical large body 120 100-700 14.14 on 2.5 40 1.375 55.00 0.5 50 50 4.5 PRE CONTRAST Window
Recon Name of Series Thickness Interval Recon
Algorithm Width/Level Direction AX PRE 2.5 2.5 std full 400/40 head/feet Must be first recon. ANGIO PHASE AX ANGIO 2.5 2.5 std full 400/40 head/feet Must be first recon. COR ANGIO 2.5 2.5 std full 400/40 front/back SAG ANGIO 2.5 2.5 std full 400/40 left/right AX ANGIO THINS 1.25 1.25 std full 400/40 head/feet 3D VRT (spin) 0.625 0.625 std full 400/40 DELAY PHASE (5 mins) AX DELAY Must be first recon. 2.5 2.5 std full 400/40 head/feet

CTA Abdominal Aorta (Abdomen/Pelvis) PHILIPS PARAMETERS & RECONS For the Pre Contrast, Angio and Delay (5 mins) phases: Scan
Dose
3D
Scan
Mode kV Avg
mAs Index Dose Pitch Detect Colli Rot Time Time Incisive 128 helical 120 103 20 on 1.00 64 0.625 0.75 9.4 PRE CONTRAST Recon
Name of Series Thick Interval Filter Window iDose Direction AX PRE 3.0 3.0 B mediastinum 3 head/feet ANGIO PHASE AX ANGIO 3.0 3.0 B mediastinum 3 head/feet AX ANGIO THINS 1.0 1.0 B mediastinum 3 head/feet COR ANGIO 3.0 3.0 B mediastinum 3 front/back SAG ANGIO 3.0 3.0 B mediastinum 3 left/right 3D VRT (spin) 0.75 0.5 DELAY PHASE (5 mins) AX DELAY 3.0 3.0 B mediastinum 3 head/feet