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Circle of Willis

Philips CT Clinical Science Philips Healthcare USA

Clinical AreaHead
ExamCardCircle of Willis
InstitutionFletcher Allen Health Care
Publication DateSep 1, 2004
ScannerBrilliance 40 Channel Version: Brilliance Version 1.2
Circle of Willis
Scan 1Injection protocol
Scan 2Surview
Scan 3Bolus Tracking scan
Scan 4Contrast scan
Scan 5Post processing visualization
Scan 6Post processing visualization

Injection Protocol
Power InjectorYes with time lapse
Size of Angiocath20 G / 18 G preferred
Contrast TypeOmnipaque / Isovue
Amount of Contrast100 ml total; 12-14 ml of this used for time lapse
Concentration of Contrast350 - 370 mg/ml
Contrast Injection Rate7.0 ml/sec male (must use 18 G)6.0 ml/sec female
Amount of Saline50 ml
Saline Injection Rate6.0 ml/sec
Delay(s) to ScanDelay is dependent on time lapse series

Landmark - Head FirstBelow Chin: internal laser
Length of Surview250 mm

Bolus Tracking scan

Contrast Scan
Scan ModeHelical
Collimation40 x 0.625
FOV120-160 mm (adjusted with evolving)
Thickness0.9 mm
Increment0.45 mm
Rotation Time0.5 sec
FilterB - Standard
Window/Level600/100 soft tissue
Scan DirectionInferior to superior
CoverageBase of skull to 2.5cm above dorsum sella
Approximate Scan Time5 seconds
Additonal ReconstructionsAxial: Filter A for post processing and then send to workstation
Planar Generated Data SetsSee post processing visualization
Images to PACSRaw Images
TipsDo NOT tilt gantry for this protocol

Post Processing Visualization
ApplicationWorkspace - CT Viewer
Thickness10 x 2's: batch series
OrientationCoronal: 10 x 2'sSagittal: 10 x 2's

Post Processing Visualization
ApplicationWorkspace - CT Viewer
RenderingIsolate area of interest that will include bone removal and or clipping Tools/ Target to COW
OrientationVolume images: Axial: cine loopCoronal: cine loopSagittal: cine loop Volume images: Left Anterior Circulation Right Anterior CirculationPosterior Circulation
Images to PACS1. Axial, coronal and cine loops2. Left anterior circulation, right anterior circulation and posterior circulation

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Jul 29, 2005

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Brilliance 40-channel
brain, Brilliance Version 1.2, Circle of Willis, CT Viewer, Head, Neuro, vasculature

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