Head CT protocols for Routine Cerebrum Sequence...
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Indications
- Head trauma
- Cerebrovascular stroke
- Alteration of mental status
- General scanning
- Hydrocephalus
- Suspected metastases
Patient Positioning
Supine with Headfirst, with Arms beside the trunk.
Topogram Positioning/landmark
Lateral; 2-3 cm above the vertex.
Mode of scanning
Sequential in the Axial Plane.
Scan Orientation
Caudocranial
- Starting Location- Just above the occipital squame.
- End Location- Levek of the Vertex.
Gantry Tilt
As many degrees as required to make the scanning plane parallel to the canthomeatal line.
Field of view
Just fitting the skull including the Soft Tissue.
Contrast Administration
Nil.
Slice Thickness
5-8 mm.
Reconstruction Algorithm/Kernel
Medium smooth for the brain, Sharp kernel for bone (optional-in case of trauma or suspected or known calvarial lesion).
Comments
- The use of a headrest is recommended for head positioning.
- Spiral scanning is considered if the coronal and sagittal MPR are needed for shunt positioning, volumetric measurements, or localization of the session. The slice thickness for reconstruction should be 3-5 mm with a slice overlap of 2-3 mm.
- For the posterior fossa and the cranial base, an additional scan may be taken without gantry tilt with a slice thickness of 3-5 mm or in the spiral mode, if the MPR is needed with the same slice thickness with 2-3 mm overlap.
- During scanning avoid the orbits being included in the FOV to minimize radiation to the orbitS
Criteria of Good Image Quality
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