| Japanese |
|---|
| Title | モンテカルロ法を用いたSPECTデータ収集における散乱線の推定 |
|---|
| Subtitle | 原著 |
|---|
| Authors | 尾川浩一*, 原田康雄**, 市原隆***, 久保敦司*, 橋本省三* |
|---|
| Authors(kana) | |
|---|
| Organization | *慶應義塾大学医学部放射線医学教室, **昭和大学歯学部歯科放射線学教室, ***東芝那須工場特機装置部核医学 |
|---|
| Journal | 核医学 |
|---|
| Volume | 27 |
|---|
| Number | 5 |
|---|
| Page | 467-476 |
|---|
| Year/Month | 1990/5 |
|---|
| Article | 原著 |
|---|
| Publisher | 日本核医学会 |
|---|
| Abstract | 「要旨」 SPECTデータ収集における散乱線の定量的評価を行うため, モンテカルロシミュレーションを行った. 対象とした核種は201Tl, 99mTc, 123Iであり, 大きさの異なる被検体で線源と検出器との幾何学的な位置関係を変化させて, プラナー画像における散乱線のスペクトル, 散乱線の割合, 投影データを計算した. その結果, 被検体の大きさ, 線源位置, 光電ピークのエネルギー, エネルギーウィンドウの幅が, 収集データの散乱線成分に及ぼす影響が定量的に明らかとなった. また, これらの結果に基づき, 散乱線除去方法について検討した. |
|---|
| Practice | 臨床医学：一般 |
|---|
| Keywords | Compton scatter, Single photon emission CT, Monte Carlo method |
|---|
| English |
|---|
| Title | Estimation of Scatter Component in SPECT Planar Image Using a Monte Carlo Method |
|---|
| Subtitle | Original Articles |
|---|
| Authors | Koichi OGAWA*, Yasuo HARATA**, Takashi ICHIHARA***, Atsushi KUBO*, Shozo HASHIMOTO* |
|---|
| Authors(kana) | |
|---|
| Organization | *Department of Radiology, School of Medicine, Keio University, **Department of Dental Radiology, School of Dentistry, Showa University, ***Nasu Works, Toshiba Corporation |
|---|
| Journal | The Japanese Journal of nuclear medicine |
|---|
| Volume | 27 |
|---|
| Number | 5 |
|---|
| Page | 467-476 |
|---|
| Year/Month | 1990/5 |
|---|
| Article | Original article |
|---|
| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
|---|
| Abstract | [Summary] A Monte Carlo simulation was performed to estimate quantitatively the scattered photons in planar images of SPECT. As a phantom we used a water-filled cylinder with a line source and calculated the energy spectra of primary and multiple scattered photons separately at each pixel of the planar images. The energy spectra of primary and scattered photons were studied on following parameters : the size of the phantom ; the location of the source ; the width of the energy window centered at 72.3 (Tl-201) , 141 (Tc-99m) , and 159keV (I-123) ; and the view angle of the planar images. Obtained results were ; (1) the energy spectra of Compton scattered photon varied with the phantom size, the source location, and the photopeak energy, (2) the scattered photons within energy windows of 10-30% centered at the photopeak energy were mainly composed by Compton scatter of the first order, (3) the higher order scattering component of the Compton photons did not represent the location of the line source on the planar image, and (4) the scatter fraction defined by the ratio of the scattered photons to the primary photons increased with increasing the size of the phantom and the width of energy window at the low photopeak energy. From the results, we discussed on the scatter subtraction methods. |
|---|
| Practice | Clinical medicine |
|---|
| Keywords | Compton scatter, Single photon emission CT, Monte Carlo method |
|---|