Principles of Reconstructing Images Thicker than Acquired

The goal with MDCT is to obtain the best possible volumetric dataset by choosing a detector configuration, which couples the thinnest possible slices with a pitch that yields a table speed and an acquisition time that is compatible with the patient's breath-holding capacity. One of the strategies to reduce image noise on the axial images is to reconstruct the slices thicker than acquired. For example, 2.50 or 5.00 mm thick images are reconstructed from images that are acquired from 4 x1.25, 8 x 1.25, or 16 x 0.625 mm detector configurations (Fig. 12). This also has the added benefit of reducing the number of images, which is critical in practices that print and read from film. With these datasets, thinner slices can always be reconstructed retrospectively (as long as the raw data is available) when high quality 3D or multiplanar reformations are required or when thinner slices are needed to reduce the effects of partial volume averaging (for example, characterizing an adrenal nodule or a cystic renal mass).

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