| Japanese |
|---|
| Title | SPECTにおけるガンマカメラの不均一性に伴うアーチファクトの除去法 |
|---|
| Subtitle | 原著 |
|---|
| Authors | 尾川浩一*, 野上修二**, 久保敦司*, 橋本省三*, 鈴木謙三** |
|---|
| Authors(kana) | |
|---|
| Organization | *慶応義塾大学医学部放射線科学教室, **東京都立駒込病院放射線科 |
|---|
| Journal | 核医学 |
|---|
| Volume | 23 |
|---|
| Number | 1 |
|---|
| Page | 35-41 |
|---|
| Year/Month | 1986/1 |
|---|
| Article | 原著 |
|---|
| Publisher | 日本核医学会 |
|---|
| Abstract | 「要旨」シングルフォトンエミッションCTにおける, ガンマカメラの不均一性に伴うアーチファクトについて, その除去のための新しい手法を開発した. この手法はSPECT画像のスライス位置によってアーチファクトの現われるパターンが全て同一であることに着目している. 不均一補正はアーチファクト分布の逆数に相当する補正マトリックスを用い, これを再構成画像に乗ずることで実現される. 本論文では通常のSPECTのシステムにおいて行われている平板線源による不均一補正法と提案する補正法を比較し, その効果について論ずる. ファントムによる基礎実験の結果では, 変動係数で前者6.5%, 後者5.5%となり, アーチファクトがほとんど消失し画質の改善がみられた. また臨床データへの適用に関しても優れた補正効果が示された. |
|---|
| Practice | 臨床医学：一般 |
|---|
| Keywords | Single photon emission CT, Artifact function, Uniformity correction, Cylindrical phantom. |
|---|
| English |
|---|
| Title | Uniformity Correction of SPECT Image Using Artifact Distribution Function Obtained from a Cylindrical Phantom |
|---|
| Subtitle | Original Articles |
|---|
| Authors | Koichi OGAWA*, Shuji NOGAMI**, Atsushi KUBO*, Shozo HASHIMOTO*, Kenji SUZUKI** |
|---|
| Authors(kana) | |
|---|
| Organization | *Department of Radiology, School of Medicine, Keio University, **Department of Radiology, Metropolitan Komagome Hospital |
|---|
| Journal | The Japanese Journal of nuclear medicine |
|---|
| Volume | 23 |
|---|
| Number | 1 |
|---|
| Page | 35-41 |
|---|
| Year/Month | 1986/1 |
|---|
| Article | Original article |
|---|
| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
|---|
| Abstract | In this paper we proposed a new correction method for the artifact caused by non-uniformity of a gamma camera. The proposed method utilizes the property of artifact functions of refillable cylindrical phantom. The artifact pattern is reconstructed uniquely for the slice position and it is less depend on the distribution of the radionuclide within the object that aimed to reconstruct. Therefore it is easy to compensate the distortion of the cross sectional image with an unique artifact function corresponding to the slice position. In this method, the correction is carried out by following procedures ; (1) reconstruction of a property function of gamma camera using a cylindrical phantom, (2) calculation of correction matrix of each slice position with the artifact function, that was reconstructed in the first step, (3) compensate a reconstructed image by multipling the correction matrix corresponding to the slice position. Our fundamental experiments with a resolution phantom and a cylindrical phantom showed the validity of the correction method. As regard the relative standard deviation of corrected images, our method is superior to conventional methods that based on a uniform data obtained with a refillable flood phantom. And the results of an application to clinical study also confirmed the validity of practical use. |
|---|
| Practice | Clinical medicine |
|---|
| Keywords | Single photon emission CT, Artifact function, Uniformity correction, Cylindrical phantom. |
|---|