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Dose and image quality of electron-beam CT compared with spiral CT
G Weisser1, K J Lehmann, R Scheck
1Department of Clinical Radiology, University Hospital Mannheim, Faculty of Clinical Medicine Mannheim, University of Heidelberg Medical School, Germany.
Rationale And Objectives:
To examine dose and image quality of electron-beam CT (EBCT) with continuous volume scan versus spiral CT.
Methods:
An EBCT scanner was compared with a spiral CT (SCT) scanner. Three phantoms were used to measure low-contrast resolution, high-contrast resolution, slice width, and dose.
Results:
The EBCT scans showed 30% lower high-contrast resolution for most settings. The dose was comparable to that of spiral CT with 3 mm collimation and 76%/106% higher with EBCT for 1.5 mm/6 mm collimation. Low-contrast resolution was comparable to that of spiral CT using 3 mm collimation, slightly worse for 1.5 mm, and bad for 6 mm EBCT collimation (four times higher dose to reach comparable contrast-to-noise ratio).
Conclusions:
Significant restrictions were found using EBCT with continuous volume scan. The authors found that 3 mm collimation can yield acceptable high-contrast resolution and good low-contrast resolution compared with spiral CT. The use of 6 mm or 1.5 mm collimation needs to be restricted to selected cases.