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