142. TRACHEA DYNAMIC

Indications	Evaluate Tracheomalacia or Tracheal stenosis
Number of scan Acquisition/series	3
Scan Acquisition	1. Supine Inspiratory	2. Dynamic Expiratory	3. Repeat Dynamic Expiratory ( if necessary)
Range	2 cm above clavicular heads through both costophrenic angles	2 cm above clavicular heads through main carina	2 cm above clavicular heads through main carina
Care Dose 4D	On	On	On
Quality Reference	110 mAs	40 mAs	40 mAs
KV / Effective mAs / Rotation time	120 / 110 / 0.5 seconds	120 / 40 / .42 seconds	120 / 40 / .42 seconds
Detector Collimation	0.75 mm	1.5 mm	1.5 mm
Slice Thickness	1 mm	2 mm	2 mm
Pitch factor	1.3	1.5	1.5
Kernel (for initial reconstruction)	B30f	B80s	B80s
Increment	1 mm	1 mm	1 mm
Image order	Cranial - Caudal	Cranial - Caudal	Cranial - Caudal
Oral Contrast	None	None	None
IV contrast	None	None	None
Injection Rate	N/A	N/A	N/A
Scan Delay	N/A	Have patient forcibly exhale 1 second after technologist pushes button to initiate scan	Have patient forcibly exhale 1 second after technologist pushes button to initiate scan
Reconstruction (Series to send to PACS)	1. Recon 3x3 B30f mediastinum medium smooth 2. Recon 2x2 B80f lung ultrasharp 3. Recon 1x1 B80s 4. Recon 1x1 B80s 3D Card for coronal reconstruction 5. MIP 20 mm slab 4mm increments 6. Recon 2 x1 B80s 7. Recon 2 x1 B80s

Clinical