| Japanese |
|---|
| Title | SPECTにおけるγ線透過型CTの有効視野の拡大 |
|---|
| Subtitle | 《原著》 |
|---|
| Authors | 尾川浩一*,**, 久保敦司** |
|---|
| Authors(kana) | |
|---|
| Organization | *法政大学工学部電子情報学科, **慶應義塾大学医学部放射線科学教室 |
|---|
| Journal | 核医学 |
|---|
| Volume | 33 |
|---|
| Number | 9 |
|---|
| Page | 975-979 |
|---|
| Year/Month | 1996/9 |
|---|
| Article | 原著 |
|---|
| Publisher | 日本核医学会 |
|---|
| Abstract | 「要旨」SPECTにおいてγ線の体内での吸収を正確に補正するためには, 体内でのγ線の吸収係数分布が不可欠である. これを得るために, γ線による透過型CTが実施されているが, 映像化の対象となる領域が再構成領域から外れてしまうことがあり, 吸収補正の実施を困難なものとしている. 本研究では, γ線透過型CTの視野拡大を目的として, 線状線源とファンビームコリメータを用いた3種類のジオメトリに関して, 検出器の長さと有効視野の関係を定式化した. |
|---|
| Practice | 臨床医学：一般 |
|---|
| Keywords | Single photon emission CT, Effective field of view, Fan-beam collimator, Transmission CT. |
|---|
| English |
|---|
| Title | Enlargement of Effective Field of View in Gamma-Ray Transmission CT Using a Fan-Beam Geometry |
|---|
| Subtitle | - Original Articles - |
|---|
| Authors | Koichi OGAWA*,**, Atsushi KUBO** |
|---|
| Authors(kana) | |
|---|
| Organization | *Department of Electronic Informatics, College of Engineering, Hosei University, **Department of Radiology, School of Medicine, Keio University |
|---|
| Journal | The Japanese Journal of nuclear medicine |
|---|
| Volume | 33 |
|---|
| Number | 9 |
|---|
| Page | 975-979 |
|---|
| Year/Month | 1996/9 |
|---|
| Article | Original article |
|---|
| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
|---|
| Abstract | Quantitative SPECT images require to correct attenuation of the gamma rays in the body, therefore, it is desired to obtain a true attenuation map measured by gamma-ray transmission CT. Many methods and geometries of the gamma-ray transmission data acquisition system have been proposed, however, there is a limitation in the size of the scintillator and this causes a serious artifact in reconstructed images of thorax. In this paper, we formulated the relation between the detector length and the effective field of view for following data acquisition geometries in gamma-ray transmission CT; a detector with a symmetric fan-beam collimator which has long focal length, two detectors with a symmetric fan-beam collimator, and a detector with an asymmetric fan-beam collimator. |
|---|
| Practice | Clinical medicine |
|---|
| Keywords | Single photon emission CT, Effective field of view, Fan-beam collimator, Transmission CT. |
|---|