| Japanese |
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| Title | Single Photon Emission Computed Tomographyによる肝容積測定のための計数法の検討 |
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| Subtitle | 原著 |
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| Authors | 仙田宏平*, 田中孝二**, 佐久間貞行*** |
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| Organization | *名古屋第一赤十字病院放射線科, **県立多治見病院核医学検査室, ***名古屋大学医学部放射線医学教室 |
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| Journal | 核医学 |
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| Volume | 21 |
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| Number | 4 |
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| Page | 297-304 |
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| Year/Month | 1984/4 |
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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」 Single photon emission computed tomographyにより肝容積を測定する方法として, 計数法を基礎的ならびに臨床的に検討した. 肝測定容積は, 基本的に, 肝横断像の肝内総集積計数を単位ボクセル計数で割り, これに単位ボクセルの実大容積を掛けることによって算定した. 各種ファントム実験において, 横断像に係数12/100の吸収補正と補間的バックグラウンド除去を行い, 簡便な方法で肝内総集積計数と単位ボクセル計数を算出したところ, 測定容積は実容積との差が±4%以内にできた. この測定精度は検査時にファントムを移動した場合でも得られた. 正常肝31症例の測定容積は, 患者の体表面積, 身長ならびに体重と有意 (p<0.01) に相関し, 平均で1,087±192cm3となった. 病的肝50症例の体表面積で補正した測定容積は, 肝炎, うっ血肝, 脂肪肝および肝転移例で有意 (p<0.01) に大きかったが, 良性腫瘍, 肝細胞癌および非活動型慢性肝炎例では正常大となった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Liver volume, Counting method, Single photon emission computed tomography. |
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| English |
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| Title | Evaluation of a Counting Method for Liver Volume Determination Using Single Photon Emission Computed Tomography |
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| Subtitle | Original Articles |
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| Authors | Kohei SENDA*, Kouji TANAKA**, Sadayuki SAKUMA*** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, The Japanese Red Cross Nagoya First Hospital, **Department of Nuclear Medicine, Tajimi Prefectural Hospital, ***Department of Radiology, Nagoya University School of Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 21 |
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| Number | 4 |
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| Page | 297-304 |
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| Year/Month | 1984/4 |
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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 counting method for liver volume determination using single photon emission computed tomography was evaluated experimentally with phantoms and clinically with 31 normal and 50 abnormal livers. Liver volume was fundamentally determined as a product of the quotient of total intrahepatic counts divided by unit voxel counts and the life-sized volume of a voxel. Total intrahepatic counts were measured in a region of interest which included every boundary of the cross-sectional image of liver. Unit voxel counts were obtained as average matrix counts in the region enclosed with matrices of 80% peak isocount on the cross-sectional image at the level of the portal. Phantom volume determined agreed with the actual volume within +-4% when the image was processed by absorption correction with a coefficient of 12/100 and interpolative back-ground subtraction. This agreement was recognized even if the phantom was moved 4 cm along body axis. Clinical volume measurement was reproducible within +-6%. The mean liver volume of normal cases with a mean body surface area of 1.58+0.16 (S.D.) m2 was 1,087+192 (S.D.) cm3. The volume was significantly (p<0.01) correlated with body surface area, height, and weight. Abnormal liver volume corrected by body surface area was significantly (p<0.01) increased in cases with active hepatitis, liver congestion, fatty liver and metastatic tumor, being within normal limits in cases with benign tumor, hepatoma, and chronic inactive hepatitis. It is concluded that the method makes it possible to determine the volume of normal hepatic parenchyma under no influence of partial volume effect, boundary recognition, and patient respiration. |
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| Practice | Clinical medicine |
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| Keywords | Liver volume, Counting method, Single photon emission computed tomography. |
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