Evaluation of the CT dose index for scans with an ECG using a 320-rowmultiple-detector CT scanner

Masanao Kobayashi, Yasuki Asada, Kosuke Matsubara, Kichiro Koshida, Shouichi Suzuki, Yuta Matsunaga, Ai Kawaguchi, Tomonobu Haba, Kazuhiro Katada, Hiroshi Toyama

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Article numberncu331
Pages (from-to)532-541
Number of pages10
JournalRadiation protection dosimetry
Issue number4
Publication statusPublished - 01-12-2015

All Science Journal Classification (ASJC) codes

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health


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