HIGH-RESOLUTION CHEST CT C+
(last updated 7/9/2019, last reviewed 02/10/2022)
(last updated 7/9/2019, last reviewed 02/10/2022)
INDICATION: Same as for HRCT C-, when IV contrast is specifically requested. In the setting of sarcoidosis, IV contrast is preferred for accurate evaluation of hilar adenopathy.
SERIES
- 3mm Axial Soft Tissue
- 1mm Axial Lung
- 1mm Axial Hi-Res Lung
- 1mm Axial Expiratory Lung
- 3mm Coronal Lung
- 3mm Coronal Mediastinal
- 3mm Sagittal Lung
- Coronal MIP lung
| | STANDARD | HI-RES | EXPIRATORY |
|
POSITIONING/MODE
|
supine/helical |
supine/axial |
supine/axial |
|
kV/mA/rot time
|
per scanner protocol CareDose/iDose/ASIR Care kV 120 kVp </= 1 sec |
per scanner protocol CareDose/iDose/ASIR Care kV 120 kVp </= 1 sec |
per scanner protocol CareDose/iDose/ASIR Care kV 120 kVp </= 1 sec |
|
INTERVAL/SPACING
|
contiguous |
10mm |
(3 images) |
|
SLICE THICKNESS
|
3mm |
1mm |
1mm |
|
PITCH
|
1 to 1.5 |
1 to 1.5 |
1 to 1.5 |
|
TABLE FEED
|
4.8 cm/sec ((S16) 5.8 cm/sec (D64) |
--- |
--- |
|
KERNAL
|
std and lung |
lung |
lung |
|
SFOV
|
300 to 350 mm |
300 to 350 mm |
300 to 350 mm |
|
COVERAGE
|
thoracic inlet -> adrenals
|
apices -> bases |
level of aortic arch level of carina level of lung bases |
|
ACQUISITION
|
craniocaudal |
craniocaudal |
craniocaudal |
|
ORAL CONTRAST
|
none |
none |
none |
|
IV CONTRAST
|
weight-based dosing (default 75 mL Isovue 300 30 mL saline) |
--- |
--- |
|
INJECTION RATE
|
2.5 mL/sec |
--- |
--- |
|
SCAN DELAY
|
40 sec |
--- |
--- |
|
RESPIRATION
|
Inspiration |
Inspiration |
End Expiration |
|
POSTPROCESSING
|
3mm axial lung 3mm axial mediastinal 3mm Cor and Sag lung 3mm Cor mediastinal Cor slab MIP lung |
axial lung |
axial lung |
NOTES:
Expiratory scans should be obtained routinely 3 axial end-expiratory 1mm thick images (level of aortic arch, carina, and just above dome of diaphragm)
Prone position as needed (ie differentiate dependent atelectasis from fibrosis or asbestosis).
If dependent densities are present, consider prone images. Consider prone position for evaluation of asbestosis. Check with radiologist if there is a question.
Window/ Level for HRCT should be –700/1000 to –700/1500