Evaluation of the CT dose index for scans with an ECG using a 320-row multiple-detector CT scanner.
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.
Department 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.
Masanao
M
Kobayashi
Graduate School of Health Sciences, Fujita Health University, Toyoake, Japan.
Yasuki
Y
Asada
Graduate School of Medical Sciences, Division of Medical Sciences, Kanazawa University, Kanazawa, Japan.
Kosuke
K
Matsubara
Graduate School of Medical Sciences, Division of Medical Sciences, Kanazawa University, Kanazawa, Japan.
Kichiro
K
Koshida
Graduate School of Health Sciences, Fujita Health University, Toyoake, Japan.
Shouichi
S
Suzuki
Department of Imaging, Nagoya Kyoritsu Hospital, Nagoya, Japan.
Yuta
Y
Matsunaga
Department of Radiology, Toyota Memorial Hospital, Toyota, Japan.
Ai
A
Kawaguchi
Department of Radiology, Fujita Health University Hospital, Toyoake, Japan.
Tomonobu
T
Haba
Department of Radiology, Fujita Health University School of Medicine, Toyoake, Japan.
Kazuhiro
K
Katada
Department of Radiology, Fujita Health University School of Medicine, Toyoake, Japan.
Hiroshi
H
Toyama
D017023:Coronary Angiography / Q000379:methods*; D004562:Electrocardiography / Q000379:methods*; D006321:Heart; D006339:Heart Rate; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D061330:Multidetector Computed Tomography / Q000379:methods*; D019047:Phantoms, Imaging; D011446:Prospective Studies; D011829:Radiation Dosage; D015898:Tomography Scanners, X-Ray Computed / Q000592:standards*