JP4401751B2 - アーティファクト低減を容易にする方法及び装置 - Google Patents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/4241—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using energy resolving detectors, e.g. photon counting
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- A—HUMAN NECESSITIES
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
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- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
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Description
12 ガントリ
14 放射線源
16 X線ビーム
18 検出器アレイ
20 検出器素子
22 患者
24 回転中心
26 制御機構
42 表示器
46 モータ式テーブル
48 ガントリ開口
50 媒体読み取り装置
52 媒体
60 アーティファクト低減を容易にする画像に基づく方法
62 インタリーブ式二重エネルギ投影データ
120 アーティファクト低減を容易にする投影に基づく方法
122 インタリーブ式二重エネルギ投影データ
Claims (10)
- 源エネルギーの連続的変更により、単一のスキャンの間に高いエネルギーと低いエネルギーのエネルギ・スペクトルに連続的に変更するように構成された1以上の放射線源(14)と、
1以上の放射線検出器(18)と、
前記1以上の放射線源及び前記1以上の放射線検出器に動作に関して結合されているコンピュータ(36)とを備えた多重エネルギ型計算機式断層写真法(MECT)システム(10)であって、前記コンピュータは、
対象(22)の走査について投影データを受け取り、
前記投影データが、第一のエネルギ・スペクトルに対応した第一の組の投影データと、第二のエネルギ・スペクトルに対応した第二の組の投影データとを含む複数の連続的投影データに対応しており、
前記第一の組の投影は前記第二の組の投影とインタリーブされており、
前記コンピュータは、
前記第一の組の投影に対応する投影データをスペクトル・シフト補償して前記第二のエネルギ・スペクトルに対応した変換後の第二のエネルギ・スペクトル・投影データとし、
前記第二の組の投影に対応する投影データをスペクトル・シフト補償して前記第一のエネルギ・スペクトルに対応した変換後の第一のエネルギ・スペクトル・投影データとし、
前記第一の組の投影データを用いて1以上の第一のエネルギ画像を再構成し、
前記第二の組の投影データを用いて1以上の第二のエネルギ画像を再構成し、
前記変換後の第一のエネルギ・スペクトル・投影データを用いて1以上の変換後の第一のエネルギ画像を再構成し、
前記変換後の第二のエネルギ・スペクトル・投影データを用いて1以上の変換後の第二のエネルギ画像を再構成し、
1以上の前記第一のエネルギ画像を1以上の前記変換後の第一のエネルギ画像と結合して1以上の結合後の第一のエネルギ画像を形成し、
1以上の前記第二のエネルギ画像を1以上の前記変換後の第二のエネルギ画像と結合して1以上の結合後の第二のエネルギ画像を形成するように構成されている、多重エネルギ型計算機式断層写真法(MECT)システム(10)。 - 前記コンピュータ(36)はさらに、1以上の定量的物質特徴評価画像を形成するために前記結合後の第二のエネルギ画像及び前記結合後の第一のエネルギ画像を分解するように構成されている、請求項1に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 前記コンピュータ(36)は、コンプトン及び光電分解、基底物質分解(BMD)、並びに対数減算分解(LSD)の1以上を用いて1以上の結合後の第二のエネルギ画像を分解するように構成されている、請求項2に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 1以上の放射線源(14)と、
1以上の放射線検出器(18)と、
前記1以上の放射線源及び前記1以上の放射線検出器に動作に関して結合されているコンピュータ(36)とを備えた多重エネルギ型計算機式断層写真法(MECT)システム(10)であって、前記コンピュータは、
対象(22)の走査について投影データを受け取り、
前記投影データが、第一のエネルギ・スペクトルに対応した第一の組の投影データと、第二のエネルギ・スペクトルに対応した第二の組の投影データとを含む複数の連続的投影データに対応しており、
前記第一の組の投影は前記第二の組の投影とインタリーブされており、
前記コンピュータは、
前記第一の組の投影に対応する投影データをスペクトル・シフト補償して前記第二のエネルギ・スペクトルに対応した変換後の第二のエネルギ・スペクトル・投影データとし、
前記第二の組の投影に対応する投影データをスペクトル・シフト補償して前記第一のエネルギ・スペクトルに対応した変換後の第一のエネルギ・スペクトル・投影データとし、
前記第一の組の投影データを前記変換後の第一のエネルギ・スペクトル・投影データと結合して、結合後の第一のエネルギ・スペクトル・投影データを形成し、
前記第二の組の投影データを前記変換後の第二のエネルギ・スペクトル・投影データと結合して、結合後の第二のエネルギ・スペクトル・投影データを形成するように構成されている、多重エネルギ型計算機式断層写真法(MECT)システム(10)。 - 前記コンピュータ(36)はさらに、1以上の定量的物質特徴評価画像を形成するために前記結合後の第一のエネルギ・スペクトル・投影データ及び前記結合後の第二のエネルギ・スペクトル・投影データを分解するように構成されている、請求項4に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 前記コンピュータ(36)はさらに、前記結合後の第一のエネルギ・スペクトル・投影データを用いて1以上の結合後の第一のエネルギ画像を再構成するように構成されている、請求項4に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 前記コンピュータ(36)はさらに、前記結合後の第二のエネルギ・スペクトル・投影データを用いて1以上の結合後の第二のエネルギ画像を再構成するように構成されている、請求項6に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 前記コンピュータ(36)はさらに、1以上の定量的物質特徴評価画像を形成するために前記結合後の第一のエネルギ画像及び前記結合後の第二のエネルギ画像を分解するように構成されている、請求項7に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 前記コンピュータ(36)は、コンプトン及び光電分解、基底物質分解(BMD)、並びに対数減算分解(LSD)の1以上を用いて前記結合後の第一及び第二のエネルギ・スペクトル・投影データを分解するように構成されている、請求項5に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
- 前記コンピュータ(36)は、コンプトン及び光電分解、基底物質分解(BMD)、並びに対数減算分解(LSD)の1以上を用いて前記結合後の第一及び第二のエネルギ画像を分解するように構成されている、請求項8に記載の多重エネルギ型計算機式断層写真法(MECT)システム(10)。
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US10/306,197 US7272429B2 (en) | 2002-11-27 | 2002-11-27 | Methods and apparatus for facilitating a reduction in artifacts |
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JP (1) | JP4401751B2 (ja) |
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DE (1) | DE10356116A1 (ja) |
NL (1) | NL1024888C2 (ja) |
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DE10356116A1 (de) | 2004-06-09 |
US7272429B2 (en) | 2007-09-18 |
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US20040102688A1 (en) | 2004-05-27 |
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JP2004188187A (ja) | 2004-07-08 |
CN100482164C (zh) | 2009-04-29 |
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