| Japanese |
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| Title | Triple Energy Window (TEW) 収集機能のないSPECT装置によるTEW法を用いた散乱線の補正に関する検討 |
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| Subtitle | 《技術報告》 |
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| Authors | 藤岡弘良*, 井上武**, 石丸良広**, 赤宗明久**, 村瀬研也***, 棚田修二***, 池添潤平*** |
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| Authors(kana) | |
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| Organization | *松山市民病院放射線室, **松山市民病院放射線科, ***愛媛大学医学部附属病院放射線科 |
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| Journal | 核医学 |
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| Volume | 34 |
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| Number | 4 |
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| Page | 251-258 |
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| Year/Month | 1997/4 |
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| Article | 報告 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」123Iを用いた脳SPECTに関し, Triple Energy Window(TEW)法における三つのエネルギーウィンドウのうち, メインウィンドウの両側に設定したサブウィンドウのデータを合算収集することにより, TEW収集機能のないSPECT装置においてもTEW法が使用できるように工夫した. 工夫した方法の有効性についてファントム実験により検討した. 123Iを用いて, 合算収集したサブウィンドウのデータの固有均一性をNEMA規格により測定した結果, エネルギーウィンドウ幅が5keVで積分および微分均一性は最小となり, それぞれ5.8%, 4.2%であった. また, 白質と灰白質に123I水溶液を1: 4.3の濃度比で満たした脳ファントムについて, 本法を用いて散乱線補正を行った場合, 白質と灰白質のSPECT値の比は1: 4.26となり, 散乱線補正を行わない場合(1: 2.08)に比べ真の値に近づいた. 本法により従来のSPECT装置においてもTEW法が応用可能であり, また簡便であるため, ルーチン検査に有用な方法であると考えられる. |
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| Practice | 臨床医学：一般 |
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| Keywords | Single photon emission computed tomography (SPECT), Compton-scatter correction, Triple energy window method, Phantom experiments. |
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| English |
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| Title | Compton-Scatter Correction Using the Triple Energy Window (TEW) Method in Conventional Single Photon Emission Computed Tomography without TEW Acquisition Hardware |
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| Subtitle | |
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| Authors | Hiroyoshi FUJIOKA*, Takeshi INOUE*, Yoshihiro ISHIMARU*, Akihisa AKAMUNE*, Kenya MURASE**, Shuji TANADA**, Junpei IKEZOE** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, Matsuyama Shimin Hospital, **Department of Radiology, Ehime University Hospital |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 34 |
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| Number | 4 |
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| Page | 251-258 |
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| Year/Month | 1997/4 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | We devised a method which allowed the triple energy window (TEW) method to be applied for Compton-scatter correction in conventional single photon emission computed tomography (SPECT) systems without any hardware for TEW acquisition. In this method, the data within two subwindows located at both sides of the main window were acquired together. The effectiveness of this method was investigated by phantom experiments. The integral and differential uniformities measured using a flood phantom filled with 123I were minimized when the energy width of subwindows was 5 keV (5.8% and 4.2%, respectively). When this method was applied to a brain phantom filled with 123I in which the relative activities in white and gray matter were assigned as 1: 4.3, the ratio of SPECT values between them was more accurate (1: 4.26) than that obtained without this method (1: 2.08). This method appears to be useful for Compton-scatter correction in SPECT, because it can be applied to conventional SPECT systems without any hardware for TEW acquisition and is available for routine clinical use for its simplicity. |
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| Practice | Clinical medicine |
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| Keywords | Single photon emission computed tomography (SPECT), Compton-scatter correction, Triple energy window method, Phantom experiments. |
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