| Japanese |
|---|
| Title | ファントムを用いた心筋SPECT画像再構成角度の検討 - 360度像と180度像との比較 - |
|---|
| Subtitle | 《技術報告》 |
|---|
| Authors | 柏倉健一*,**, 柏倉明美***, 寺田慎一郎****, 小林秀樹**** |
|---|
| Authors(kana) | |
|---|
| Organization | *科学技術振興事業団, **秋田県立脳血管研究センター放射線医学研究部, ***秋田県立脳血管研究センター放射線科, ****東京女子医科大学放射線科 |
|---|
| Journal | 核医学 |
|---|
| Volume | 33 |
|---|
| Number | 10 |
|---|
| Page | 1097-1103 |
|---|
| Year/Month | 1996/10 |
|---|
| Article | 報告 |
|---|
| Publisher | 日本核医学会 |
|---|
| Abstract | 「要旨」心筋SPECT像における画像再構成角度と得られた画像の区域, 欠損部カウントの変動, 欠損コントラストとの関係を明らかにする目的で, thallium-201(201Tl), technetium-99m(99mTc)を用いファントム実験を行った. この結果, 同一スライス内の区域カウントの変動は360度像と180度像とでほぼ等しかった. ただし, スライス間の平均カウントの変動は360度像の方が小さかった(201Tl, 99mTc). また, RI濃度が対心筋比24%(201Tl), 22%(99mTc)の溶液を心筋部4か所に封入し, 欠損とした画像の欠損部カウントの変動は, 201Tlでは360度像が, 99mTcでは180度像が小さかった. 画像上のカウントから得た欠損コントラストと実際のRI濃度比から得たコントラストとを平均値で比較したところ, 201Tl, 99mTcとも180度像がより近い値を示した. また, 同一スライスであっても欠損の存在する解剖学的部位によって欠損コントラストは変化した. さらに, 同一部位の欠損コントラストを360度, 180度像間で比較したところ, 前壁, 側壁, 中隔において180度像でより強調された(201Tl, 99mTc). |
|---|
| Practice | 臨床医学：一般 |
|---|
| Keywords | Myocardial SPECT imaging, SPECT reconstruction, 180°, 360° scan, Defect contrast. |
|---|
| English |
|---|
| Title | Evaluation of Reconstruction Arc in Myocardial SPECT Imaging Using a Cardiac Phantom - Comparison between 360° and 180° Arcs - |
|---|
| Subtitle | |
|---|
| Authors | Kenichi KASHIKURA*,**, Akemi KASHIKURA**, Shinichirou TERADA***, Hideki KOBAYASHI*** |
|---|
| Authors(kana) | |
|---|
| Organization | *Japan Science and Technology Corporation, **Department of Radiology and Nuclear Medicine, Akita Research Institute of Brain and Blood Vessels, ***Department of Radiology, Tokyo Women's Medical College |
|---|
| Journal | The Japanese Journal of nuclear medicine |
|---|
| Volume | 33 |
|---|
| Number | 10 |
|---|
| Page | 1097-1103 |
|---|
| Year/Month | 1996/10 |
|---|
| Article | Report |
|---|
| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
|---|
| Abstract | In order to investigate the effect of reconstruction arc on myocardial SPECT images, a series of phantom studies was performed with and without plastic chambers simulating perfusion defects using 201Tl and 99mTc. Coefficient of variations (CV) of the counts among the ROIs and defect contrast were evaluated in 360° and 180° images reconstructed from the same 360° projection data. Reconstruction processes were identical for all images. In the absence of defects, the CV of the counts were approximately the same in 360° and 180° images. The CV of the counts in the 360° 201Tl image, among 4 defects located on the anterior, lateral, inferoposterior, and septal walls, was superior to those in the 180° images. In contrast, in the 99mTc images, the CV of the counts among the 4 defects in the 180° image was superior to those of the 360° image. The defect contrast was changed both by the location of the defect and by the reconstruction arc (201Tl, 99mTc). The defect contrast of the 180° images, in both 201Tl and 99mTc experiments, was closer to the true contrast value as calculated by the count ratio between myocardium and defect. Although the defect contrast in the anterior, lateral and septal walls was more emphasized in the 180° images, the defect contrast in the inferoposterior wall was less emphasized in the 180° images compared to the 360° (201Tl, 99mTc). |
|---|
| Practice | Clinical medicine |
|---|
| Keywords | Myocardial SPECT imaging, SPECT reconstruction, 180°, 360° scan, Defect contrast. |
|---|