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CTA coronary arteries

Philips CT Clinical Science Philips Healthcare USA

Clinical AreaCardiac
ExamCardCTA Coronary Arteries
InstitutionCarmel Medical Center
Publication DateSep 1, 2004
ScannerBrilliance 40 Channel Version: Brilliance Version 1.2
CTA Coronary Arteries
Scan 1Injection Protocol
Scan 2Surview
Scan 3Without Contrast Scan - Prospective Calcium Scoring
Scan 4Bolus Tracking Locator Image
Scan 5Bolus Tracking Scan
Scan 6Contrast Scan - Coronary CTA
Scan 7Post Processing Visualization
Scan 8Post Processing Visualization

Injection Protocol
Power InjectorYes with bolus tracking
RouteRAC or LAC
Size of Angiocath19-20 G
Amount of Contrast(Scan time + 5 sec) x flow rate If using a dual head injector add 40 cc saline and decrease the volume by 20% If the patient is 80-100kg it is recommended to keep the full volume while the using the saline pushIf the patient is over 100kg it is recommended to add 10% of the calculated volume
Concentration of Contrast350 mg/ml or greater
Contrast Injection RateHeart only 5-6 ml/secWhole Chest by-pass 4 ml/sec
Amount of Saline40 ml
Saline Injection RateSame rate as for scan
Delay(s) to ScanScan triggered off of bolus tracking threshold

Landmark - Feet FirstAbove shoulders
Landmark - Head FirstBelow diaphragm
Length of Surview400 mm
TipsECG leads connected to hairless area on the chest. Carbon tapes are highly recommendedBreathing instructions are explained and trained to the patient as well as the what they will feel during the rapid contrast injection

Without Contrast Scan - Prospective Calcium Scoring
Scan ModeAxial
Collimation16 x 2.5
Thickness2.5 mm
Rotation Time0.42 sec or 0.5 if one wants to use the database
FilterB - Standard
Scan DirectionCarina down to bottom of heart
CoverageDepends on coverage
TipsDouble Check the ECG monitor to make sure you are getting a good readingUse the images from the Calcium Scoring study to plan the CTACTA start point is placed 20 mm above the most superior slice where a coronary artery can be seen. The end point is 20 mm below the apex of the left ventricle

Bolus Tracking Locator Image
Landmark PositionDescending aorta 2 cm above the start point
Scan LocationMid chest

Bolus Tracking Scan
Threshold Preset110 HU
Post Threshold Trigger(s) for Delay ScanNo more than 3-4 sec
TipsSpeakers should be off in the protocolBreathing instructions should be manually given to the patient when the tracker crosses the threshold line

Contrast Scan - Coronary CTA
Scan ModeHelical
ResolutionDetail* (see tips)
Collimation40 x 0.625
Thickness0.625 mm
Increment0.3 mm
Rotation Time0.42 seconds
FilterCA - Cardiac Smooth or CB - Cardiac Standard
Scan DirectionTop Down
Coverage2 cm above the coronary arteries to 2 cm below the apex of the left ventricle
Approximate Scan Time8-17 sec
Phase Reconstruction75 %
Additonal ReconstructionsAll phases that are required
Tips*Detail can not exceed 250 mm F.O.V.

Post Processing Visualization
ApplicationWorkspace - CT Viewer
RenderingMIP and Slab
Thickness0.625 mm

Post Processing Visualization
ApplicationWorkspace - Calcium Scoring, Cardiac Viewer, Coronary CT Angio

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Jul 29, 2005

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Brilliance 40-channel
Brilliance Version 1.2, Calcium Scoring, Cardiac, Cardiac Viewer, chest CTA, coronary arteries, CT Viewer, MIP, retrospective, Vascular

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