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Short communication: helical computed tomography: where is the cut?
1Radiation Physics Department, St Bartholomew's Hospital, London, UK.
The British Journal of Radiology
|January 1, 1994
Summary
Helical scanning in computed tomography (CT) introduces shadow, streaking artifacts, and increased partial volume effects compared to axial scanning. These image quality differences are significant for helical CT mode analysis.
Area of Science:
- Medical Imaging
- Radiology
- Computed Tomography
Background:
- Computed tomography (CT) utilizes different scanning modes for image acquisition.
- Helical scanning involves continuous table movement, differing from traditional axial scanning.
Purpose of the Study:
- To compare image quality between helical and axial scanning modes.
- To identify specific artifacts and effects associated with helical CT scanning.
Main Methods:
- Utilized the IGE HiSpeed Advantage CT system (software version ZA).
- Employed a contrast-detail phantom for comparative analysis.
- Evaluated image acquisition parameters between helical and axial modes.
Main Results:
- Observed distinct shadow and streaking artifacts in helical scanning mode.
- Noted an increased partial volume effect in helical scans compared to axial scans.
- Projections acquired in helical mode are inconsistent with axial mode.
Conclusions:
- Helical scanning mode introduces specific image artifacts not present in axial mode.
- The partial volume effect is more pronounced in helical CT imaging.
- Understanding these differences is crucial for accurate CT image interpretation.