Electrocardiogram-gated coronary CT angiography dose estimates using ImPACT
| Autor: | Yuta Matsunaga, Ryouichi Kato, Masanao Kobayashi, Hiroshi Toyama, Kosuke Matsubara, Tomonobu Haba, Ai Kawaguchi, Yasuki Asada, Kichiro Koshida, Shouichi Suzuki |
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| Rok vydání: | 2016 |
| Předmět: |
Cardiac function curve
medicine.medical_specialty Tomography Scanners X-Ray Computed effective dose Cardiac-Gated Imaging Techniques 030204 cardiovascular system & hematology Coronary Angiography coronary CT angiography Effective dose (radiation) Imaging phantom 030218 nuclear medicine & medical imaging Electrocardiography 03 medical and health sciences Medical Imaging 0302 clinical medicine Heart rate Humans Medicine Dosimetry Radiology Nuclear Medicine and imaging Prospective Studies organ dose Instrumentation Retrospective Studies Computed tomography angiography ImPACT Radiation medicine.diagnostic_test Phantoms Imaging business.industry computed tomography Heart Tomography Radiology Tomography X-Ray Computed business Nuclear medicine |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| DOI: | 10.1120/jacmp.v17i4.6218 |
| Popis: | The primary study objective was to assess radiation doses using a modified form of the Imaging Performance Assessment of Computed Tomography (CT) scanner (ImPACT) patient dosimetry for cardiac applications on an Aquilion ONE ViSION Edition scanner, including the Ca score, target computed tomography angiography (CTA), prospective CTA, continuous CTA/cardiac function analysis (CFA), and CTA/CFA modulation. Accordingly, we clarified the CT dose index (CTDI) to determine the relationship between heart rate (HR) and X‐ray exposure. As a secondary objective, we compared radiation doses using modified ImPACT, a whole‐body dosimetry phantom study, and the k‐factor method to verify the validity of the dose results obtained with modified ImPACT. The effective dose determined for the reference person (4.66 mSv at 60 beats per minute (bpm) and 33.43 mSv at 90 bpm) were approximately 10% less than those determined for the phantom study (5.28 mSv and 36.68 mSv). The effective doses according to the k‐factor (0.014 mSv·mGy−1·cm−1; 2.57 mSv and 17.10 mSv) were significantly lower than those obtained with the other two methods. In the present study, we have shown that ImPACT, when modified for cardiac applications, can assess both absorbed and effective doses. The results of our dose comparison indicate that modified ImPACT dose assessment is a promising and practical method for evaluating coronary CTA. PACS number(s): 87.57.Q‐, 87.59.Dj, 87.57.uq |
| Databáze: | OpenAIRE |
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