CT — Screening cancer pulmonar (MCB)

Updated 04/28/25 CT Lung Cancer Screening Reviewed 05/14/25 Indications - lung cancer screening only in patients who meet criteria (see patient questionnaire) and follow-up of prior screening CT (unless prior report indications a routine or low-dose protocol). If patient doesn't meet screening criteria, use the low-dose protocol and use CT Chest w/o Contrast charge. Per ACR guidelines, this exam should have a CTDI of less than 3.00 mGy for a normal size patient. Use CT Lung RADS for Screening Follow-up charge. GENERAL SCAN NOTES Move the patient's arms over his/her head if possible. Remove any metal from the imaging field of view. Have the patient cough a few times to clear secretions. This reduces incidence of small lung nodules. Topogram - lung apices through diaphragm (obtained during end inspiration). Craniocaudal scan coverage - Lung apices through lung bases (obtained during end inspiration). Do not image through adrenal glands as is done with routine chest CT. Adjust FOV (field of view) on topogram to smallest without cropping anatomy. Recons are the same as routine chest protocol. IV Contrast: 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. SIEMENS PARAMETERS & RECONS Scan
Care
Scan
Mode kV mAs Care
Dose Pitch Acq Coll Rot kV & Lvl Time Time Sensation 16 NA 0.75 0.5 10.9 spiral 120 25 on 1.15 16 on 15 0.80 32 0.7 0.8 13.4 Go Up 32 spiral Sn110 62 on NA 1.40 64 0.6 0.5 5.6 Sensation 64 spiral 120 25 on on 64 0.6 0.5 6.5 1.20 Definition 64 spiral 120 28 on on 15 64 0.6 0.33 3.2 Go Top 64 spiral Sn100 179 on 0.80 128 Drive 128 spiral on 1.20 0.6 0.5 3.3 120 20 on 2.2 1.20 192 0.6 0.5 Force 192 spiral Sn100 101 on on IR
Recon
Name of Series Thick Interval Kernel Window Lvl Direction head/feet AX LUNG 3.0 3.0 Bl57 / B70f lung 3 AX SOFT 3.0 3.0 Br40 / B41f 3 mediastinum head/feet COR SOFT 3.0 3.0 Br40 / B41f mediastinum 3 front/back SAG SOFT 3.0 3.0 Br40 / B41f 3 left/right mediastinum AX THINS 1.0 0.8 Br40 / B41f 3 head/feet mediastinum AX MIPS 8.0 3.0 lung Br40 / B41f 3 head/feet

CT Lung Cancer Screening GE PARAMETERS & RECONS Scan
Smart
Scan
Slice
Beam
Rot
Dose
Thick Pitch Speed Coll Time ASIR Red Type SFOV kV mA
Range Noise
Index mA Time on NA 20 2.5 1.375 27.50 0.5 NA 5.5 LS 16 helical large 120 40-130 29.50 on 2.5 20 1.375 27.50 0.5 NA NA 5.5 Opt 540 helical large 120 40-130 29.50 40 2.5 0.984 LS VCT 64 helical large body 120 30-110 39.375 on 0 0.5 70 3.8 34.00 on 0 40 1.375 55.00 0.5 70 2.7 Disc VCT 64 helical large body 120 30-110 34.00 2.5 Recon
Window
Recon
Name of Series Thickness Interval Algorithm Width/Level Direction AX LUNG 2.5 2.5 lung 1600/-600 head/feet Must be first recon. AX SOFT 2.5 2.5 std full 400/40 head/feet COR SOFT 2.5 2.5 std full 400/40 front/back SAG SOFT 2.5 2.5 std full 400/40 left/right AX THINS 1.25 1.0 std full 400/40 head/feet AX MIPS 8.0 3.0 std full 1600/-600 head/feet PHILIPS PARAMETERS & RECONS Scan
Dose
3D
Rot Mode kV Avg
mAs Index Dose Pitch Detect Colli Scan
Time Time 0.75 5.6 Incisive 128 helical 120 23 19 on 1.00 64 0.625 Name of Series Thick Interval Filter Window iDose Recon
Direction AX LUNG 3.0 3.0 YA lung 3 head/feet AX SOFT 3.0 3.0 B mediastinum 3 head/feet COR SOFT 3.0 3.0 B mediastinum 3 front/back SAG SOFT 3.0 3.0 B mediastinum 3 left/right AX THINS 1.0 0.75 B mediastinum 3 head/feet 3 head/feet AX MIPS 8.0 2.0 B lung