心電同期CT 撮影においてボウタイフィルタとポジショニングが断面内線量分布と画質に及ぼす影響

DOI Web Site Web Site PubMed 参考文献13件
  • 南 和芳
    国立病院機構金沢医療センター中央放射線部(現　国立病院機構富山病院診療放射線科)
  • 松原 孝祐
    金沢大学医薬保健研究域保健学系
  • 林 勇樹
    国立病院機構金沢医療センター中央放射線部
  • 藤原 康人
    国立病院機構金沢医療センター中央放射線部
  • 森元 勝浩
    国立病院機構金沢医療センター中央放射線部
  • 小畠 敏典
    国立病院機構金沢医療センター中央放射線部(現　公立松任石川中央病院放射線室)

書誌事項

タイトル別名
  • Influence of Bowtie Filter and Patient Positioning on In-plane Dose Distribution and Image Quality in ECG-gated CT
  • シンデンドウキ CT サツエイ ニ オイテ ボウタイフィルタ ト ポジショニング ガ ダンメン ナイセンリョウ ブンプ ト ガシツ ニ オヨボス エイキョウ

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<p>In electrocardiographic (ECG)-gated computed tomography (CT) for diagnosis of cardiac diseases, radiation dose and image quality are optimized by limiting field of view (FOV) and centering on the heart. However, it is necessary to set wide FOV with large bowtie filter depending on patient positioning or various diagnoses such as aortic diseases. The purpose of this study is to clarify influence of bowtie filter and patient positioning on in-plane dose distribution, organ-absorbed dose, image quality in ECG-gated CT. In-plane dose distribution and organ-absorbed dose were evaluated with radio photoluminescence glass dosimeters, and signal-to-noise ratio (SNR) were measured for evaluation of image quality. The bowtie filter was used small (S) and large (L). With automatic exposure control, volume computed tomography dose index was 55.3 mGy at S and 71.8 mGy at L. The phantom was positioned on the heart of phantom (Heart) and the center of phantom (Body). In Heart-L compared with Heart-S, organ-absorbed dose was 1.29 times at breasts. In Heart-S compared with Body-S, in-plane dose distribution was increased 25% at left anterior and decreased 20% at right posterior. In SNR, S and L were decreased from 50 mm off-center. To set appropriate bowtie filter and positioning was reduced radiation dose and improved image quality in ECG-gated CT.</p>

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