| Japanese |
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| Title | 動態SPECTデータ収集時における放射能の時間的変動が再構成画像に与える影響について |
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| Subtitle | 原著 |
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| Authors | 前田寿登*, 竹田寛***, 松村要***, 中川毅***, 北野外紀雄***, 江尻和隆*, 近藤武*, 竹内昭*, 外山宏**, 竹下元**, 古賀祐彦**, 市原隆**** |
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| Authors(kana) | |
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| Organization | *藤田学園保健衛生大学衛生学部診療放射線技術学科, **藤田学園保健衛生大学医学部放射線医学教室, ***三重大学医学部放射線医学教室, ****東芝那須工場特機装置部 |
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| Journal | 核医学 |
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| Volume | 28 |
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| Number | 1 |
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| Page | 27-34 |
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| Year/Month | 1991/1 |
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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」動態SPECT時における放射性医薬品の集積, 排泄などによる急速な放射能変化はSPECT像にアーチファクトを生じさせる. 今回, シミュレーションおよびファントム実験を行い, 投影データ収集中の放射能変化がSPECT像に与える影響について検討を行った. 線線源のシミュレーションおよびJaszczakファントム実験の結果では, 1スキャン中20%程度の放射能変化では画質の劣化も認められず, また解像力に対する影響も少なかった. 実際の腎動態SPECTでは静注直後の急激な変化時では問題になるが, 1分から1分30秒間の10個の腎の変化率の平均は17.1%であり, それ以後では, いずれも10%以下であった. したがって1分以後の動態SPECT像については, 時間的放射能変化の再構成画質に与える影響は視覚的には認められなかった. |
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| Practice | 臨床医学：一般 |
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| Keywords | SPECT, Dynamic SPECT, Artifact, Simulation. |
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| English |
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| Title | The Influence of the Time Activity Variation on Dynamic SPECT Images in Camera Based SPECT |
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| Subtitle | Original Articles |
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| Authors | Hisato MAEDA*, Kan TAKEDA***, Kaname MATSUMURA***, Tsuyoshi NAKAGAWA***, Tokio KITANO***, Kazutaka EJIRI*, Takeshi KONDOU*, Akira TAKEUCHI*, Hiroshi TOYAMA**, Gen TAKESHITA**, Sukehiko KOGA**, Takashi ICHIHARA**** |
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| Authors(kana) | |
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| Organization | *Department of Radiological Technology, Fujita Health University School of Hygine, **Department of Radiology, Fujita Health University School of Medicine, ***Department of Radiology, Mie University School of Medicine, ****Nuclear Medicine Section, Toshiba Nasu Works |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 28 |
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| Number | 1 |
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| Page | 27-34 |
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| Year/Month | 1991/1 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] Image quality of dynamic single photon emission computed tomography (SPECT) using a rotating gamma camera is dependent on the time activity variation of the tracer such as accumulation and excretion in the object's organ. Especially at the early time after injection of radionuclide, artifacts may occur strongly in the SPECT images. Simulated and experimental projection data of line sources and Jaszczak phantom were altered by sequentially weighting the projections with a function that varied linearly with time. With a variation of object activity given by linearly decaying functions, the main effect observed on the SPECT images obtained from simulated line sources was an elliptical deformation on the object. If the changing rate (R(t+1)-R(t))/R(t)×100 remained within 20% during acquisition, this deformation of SPECT images of line sources was not noticeable visually and resolution (FWHM) of line sources scarcely was degraded. In renal dynamic SPECT study using 99mTc-DTPA, the image quality of the first scan (30sec) was considerably degraded. However, the changing rates after the third scan were less than 20% on the mean of 10 kidneys and the image quality was not noticeable visually. |
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| Practice | Clinical medicine |
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| Keywords | SPECT, Dynamic SPECT, Artifact, Simulation. |
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