Multislice CT of the Paranasal Sinuses
Improvements in CT imaging of the paranasal sinuses provided by multislice technology include fast coverage of the volume of interest, thin collimation (up to 0.75 mm with 16-row MSCT), and acquisition of nearly isotropic (i.e., cubic) voxels. The latter results in high quality multiplanar reformation of the data set, preferably acquired on the axial plane. According to the number of detectors of the equipment employed, the volume of interest is acquired from 4x1 mm up to 16x0.75 mm collimation and no gantry tilting. Data are then reconstructed as 1-mm thick slices with 50% slice overlap, on the axial plane. This set of images is suitable for excellent MPR post-processing (Table 1.4).
Table 1.4. MSCT scanning parameters
Collimation 4x1 mm
Rotation time 0.75 s mA/kV 70/133
Reconstruction algorithm - kernel* H70h
Volume reconstruction (axial plane)
Thickness 1.25 mm
Interslice gap 0.7 mm
Axial, no gantry tilting
16X0.75 mm 0.75 s
* Siemens equipment
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