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CTPA manual timing

ExamCard
Buxton, Heather CT Clinical Applications - Australasia New Zealand

Manual timing CTPA - Ascot Radiology, Auckland, NZ

This technique uses a manual start at 25 seconds post injection. Research conducted by Dr. Nestor Muller from Vancouver General Hospital, Vancouver, and Dr. David Hansell from Royal Brompton Hospital, London, have shown that this method provides robust enhancement of the pulmonary arteries in the majority of patients.

CTPA - Manual Timing
Scan 1Surview
Scan 2Injection Protocol
Scan 3Contrast Scan
Scan 4Recons and MPRs

Injection Protocol

Power injector Yes

Route IV

Size of Angiocath 22G

Contrast Omnipaque 350

Contrast Volume 100ml @ 4ml/s

Saline Volume 20ml @ 3ml/s

 

Start scan 25 seconds post start of injection

Contrast Scan

Scan Mode Helical

Resolution Standard

Collimation 64x0.625

FOV 340mm

Slice Thickness 0.9mm

Slice Increment 0.45mm

Pitch 0.89

Rotation Time 0.4s

KV 120

mAs 230

Matrix 512

Filter B (no enhancement)

Window/Level 350/50

Scan Direction Out\

Z DOM

Adaptive Filter

Approx Scan Time 10s

 

Additional Reconstructions

Recon 1. Mediastinal Windows

Slice Thickness 3mm

Slice Increment 0.3mm

Filter B

 

Recon 2. Lung

Slice Thickness 3mm

Slice Increment 0.3mm

Filter Lung

Reconstruction and MPR images

Axial Recon Excellent opacity of both pulmonary arteries and aorta.Oblique Axial MPR Delineation of small thromus running A-P in right pulmonary artery branch.Sagittal MPR Further delineation of thrombus running in the sagittal plane.
Axial Recon
Oblique Axial MPR
Sagittal MPR
Excellent opacity of both pulmonary arteries and aorta.
Delineation of small thromus running A-P in right pulmonary artery branch.
Further delineation of thrombus running in the sagittal plane.


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ExamCard
Brilliance 64-channel
abdomen CTA, aorta CTA, Body, Brilliance v2.0, chest, chest CTA, head CTA, kidney/renal CTA, MPR, neck CTA, pediatric CTA, peripheral runoff CTA, pulmonary arteries, Thorax, Vascular
 

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