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Optimization of multidetector array CT acquisition parameters for CT colonography.

C H McCollough
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Abstract

BACKGROUND: Multidetector array computed tomography technology has increased the number of acquisition parameters that a user must select. This article examines the criteria by which detector collimation, reconstructed scan width, reconstruction scan interval, pitch, image noise, and patient dose can be optimized. METHODS: A water phantom containing tissue-equivalent polyps in an air-filled tube was scanned using multiple acquisition parameter combinations. X-ray tube current was changed to independently match dose and noise to a single-detector array technique. Images were assessed in axial and three-dimensional formats. RESULTS: All polyps were visible in axial and three-dimensional images for all scans. Helical artifacts were noted at higher table speed values. The 5-mm-wide scans spaced at 3-mm intervals allowed visualization of the smallest polyps: 5 x 5 or 7 x 3 (diameter x height; mm). CONCLUSION: Our results indicate that thin-scan and low-noise techniques need not be used to visualize polyps of clinically relevant sizes.

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ArtifactsColonic PolypsColonography, Computed TomographicHumansPhantoms, ImagingJournal Article

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C H McCollough. Optimization of multidetector array CT acquisition parameters for CT colonography.. https://doi.org/10.1007/s00261-001-0166-9

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