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Evaluation of the CT dose index for scans with an ECG using a 320-row multiple-detector CT scanner
Masanao Kobayashi1, Yasuki Asada2, Kosuke Matsubara3
1Department of Radiology, Fujita Health University Hospital, Toyoake, Japan Graduate School of Medical Sciences, Division of Medical Sciences, Kanazawa University, Kanazawa, Japan masa1121@fujita-hu.ac.jp.
Abstract:
The relationship between heart rate (HR) and computed tomography dose index (CTDI) was evaluated using an electrocardiogram (ECG) gate scan for scan applications such as prospective triggering, Ca scoring, target computed tomography angiography (CTA), prospective CTA and retrospective gating, continuous CTA/CFA (cardiac functional analysis) and CTA/CFA modulation. Even in the case of a volume scan, doses for the multiple scan average dose were similar to those for CTDI. Moreover, it was found that the ECG gate scan yields significantly different doses. When selecting the optimum scan, the doses were dependent on many factors such as HR, scan rotation time, active time, prespecified cardiac phase and modulation rate. Therefore, it is necessary to take these results into consideration when selecting the scanning parameters.
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