| Japanese |
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| Title | 周波数空間バターワースフィルタおよびウィナーフィルタを用いた核医学画像処理に関する基礎的および臨床的検討 |
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| Subtitle | 原著 |
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| Authors | 加藤千恵次* |
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| Organization | *北海道大学医学部核医学講座 |
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| Journal | 核医学 |
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| Volume | 31 |
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| Number | 6 |
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| Page | 565-579 |
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| Year/Month | 1994/6 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」周波数空間フィルタは周波数特性に歪みがない点で画像処理に優れている. 周波数空間上でバターワースおよびウィナーフィルタの最適パラメータを自動的に計算し画像処理を行う方法を考案し, ファントム実験で適切なパラメータが導出されることを確認した. 心プール像をモデル化したファントム像および31例の心電図同期心プールシンチグラムに応用し, 実空間平滑化処理, 周波数空間上でのバターワースおよびウィナーフィルタ処理を行った. これらの画像から駆出率を求め既知または心カテ法から得た駆出率との相関を調べ, フィルタによる差を比較した. 相関は平滑化処理よりバターワースフィルタの方が優れ, バターワースフィルタよりウィナーフィルタの方が優れていた. ウィナーフィルタはカウントの少ない画像でより有効であった. 周波数空間バターワースおよびウィナーフィルタは核医学画像の雑音成分を除去し定量性の向上に有効であると考えられた. |
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| Practice | 臨床医学：一般 |
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| Keywords | Butterworth filter, Wienter filter, frequency domain, Gated cardiac blood pool study, Left ventricular ejection fraction. |
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| English |
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| Title | Experimental and Clinical Studies of Frequency Domain Butterworth Filter and Wiener Filter on Process of Radionuclide Imaging |
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| Subtitle | Original Articles |
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| Authors | Chietsugu KATO |
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| Authors(kana) | |
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| Organization | Department of Nuclear Medicine, Hokkaido University School of Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 31 |
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| Number | 6 |
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| Page | 565-579 |
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| Year/Month | 1994/6 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] A frequency domain filtering method provides accurate frequency response. In order to provide optimal radionuclide image quality, Butterworth or Wiener filters were applied in the frequency domain. A method is developed to determine automatically their optimal parameters from the power spectra of the object images. Phantom studies showed that proper parameters were derived by this method. Thirty-one cases of multigated cardiac blood-pool images and phantom images modeled on the cardiac images were filtered by 3 × 3 points temporal smoothing, frequency domain Butterworth and Wiener filters. From these images, ejection fractions were calculated and evaluated the correlation between the actual ejection fractions in the phantom study or the values derived from the contrast left ventriculography. The better correlation coefficients were derived with the frequency domain Butterworth filter than with the temporal smoothing. And more desirable correlation coefficients were derived with the frequency domain Wiener filter than with the frequency domain Butterworth filter, especially in the low count studies. Butterworth or Wiener filtering in the frequency domain reduces noise and improves the capacity for quantitative analysis in the radionuclide images. |
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| Practice | Clinical medicine |
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| Keywords | Butterworth filter, Wienter filter, frequency domain, Gated cardiac blood pool study, Left ventricular ejection fraction. |
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