CA2060181A1 - Methode et appareil pour analyser les scannographies - Google Patents

Methode et appareil pour analyser les scannographies

Info

Publication number
CA2060181A1
CA2060181A1 CA2060181A CA2060181A CA2060181A1 CA 2060181 A1 CA2060181 A1 CA 2060181A1 CA 2060181 A CA2060181 A CA 2060181A CA 2060181 A CA2060181 A CA 2060181A CA 2060181 A1 CA2060181 A1 CA 2060181A1
Authority
CA
Canada
Prior art keywords
ray
detector
data
detector array
coordinate system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2060181A
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English (en)
Other versions
CA2060181C (fr
Inventor
Robert G. Waggener
Jory D. Lange
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
W L Systems Inc
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Individual
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23545893&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2060181(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2060181A1 publication Critical patent/CA2060181A1/fr
Application granted granted Critical
Publication of CA2060181C publication Critical patent/CA2060181C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T12/00—Tomographic reconstruction from projections
    • G06T12/20—Inverse problem, i.e. transformations from projection space into object space
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/58—Testing, adjusting or calibrating thereof
    • A61B6/582—Calibration
    • A61B6/583—Calibration using calibration phantoms
    • A61B6/584—Calibration using calibration phantoms determining position of components of the apparatus or device using images of the phantom
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2211/00—Image generation
    • G06T2211/40—Computed tomography
    • G06T2211/421—Filtered back projection [FBP]

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Image Analysis (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Image Processing (AREA)

Abstract

Appareil et procédé de montage d'un simulateur de rayons X existants et de calcul d'une image tomographique calculée rétroprojetée. Le réseau de détecteur (26) est linéaire et sort des signaux provenant des photodiodes montées dans le réseau, lesquels signaux sont envoyés à un préprocesseur (32) à des fins de lissage, correction et filtrage et traitement ultérieur pour transformer le signal de celui produit par rayon X provenant d'une source de rayons en éventail (12), par exemple dans un système de coordonnées polaires, en un signal qui aurait été produit par un détecteur dans le réseau de détecteur et sur lequel un faisceau parallèle est incident sur un système de coordonnées cartésien. Les données transformées sont converties en une valeur d'échelle des gris pour un élément d'image ayant une position spécifique dans le système de coordonnées cartésien et sont affichées de manière appropriée. Les données sont prises à chaque angle incrémentiel au fur et à mesure que la source de rayons (12) et le réseau de détecteurs (26) tournent autour d'un objet cible (18). Le procédé de reconstruction de cette image rétroprojetée implique la correction et le lissage des signaux de sortie, la mise à l'échelle de ces signaux corrigés et lissés, et le convolutionnement des signaux mis à l'échelle en données caractérisant le rayon qui est incident sur chaque élément détecteur individuel en données d'intensité équivalente si le rayon incident avait eu son origine d'une source de rayon parallèle. L'invention concerne également des procédés de correction des données pour des lectures incorrectes de détecteur et pour le déplacement du réseau de détecteur (26) en conséquence à la rotation décentrée de la source de rayons X (12) ou du réseau de détecteurs (26) ou des deux.
CA002060181A 1989-08-09 1990-08-03 Methode et appareil pour analyser les scannographies Expired - Fee Related CA2060181C (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US391,252 1989-08-09
US07/391,252 US5128864A (en) 1989-08-09 1989-08-09 Method for computing tomographic scans
PCT/US1990/004374 WO1991002320A1 (fr) 1989-08-09 1990-08-03 Procede et appareil de calcul de balayages tomographiques

Publications (2)

Publication Number Publication Date
CA2060181A1 true CA2060181A1 (fr) 1991-02-10
CA2060181C CA2060181C (fr) 2000-01-18

Family

ID=23545893

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002060181A Expired - Fee Related CA2060181C (fr) 1989-08-09 1990-08-03 Methode et appareil pour analyser les scannographies

Country Status (6)

Country Link
US (2) US5128864A (fr)
EP (1) EP0486591A1 (fr)
JP (1) JPH04507210A (fr)
AU (1) AU649409B2 (fr)
CA (1) CA2060181C (fr)
WO (1) WO1991002320A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
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CN112294344A (zh) * 2019-07-30 2021-02-02 通用电气精准医疗有限责任公司 用于校正x射线成像中的x射线检测器倾斜的方法和系统
CN117471516A (zh) * 2023-08-21 2024-01-30 湖南华创医疗科技有限公司 束斑测试方法及装置
CN118533094A (zh) * 2024-05-16 2024-08-23 天津大学 一种透明薄壁器件三维轮廓及壁厚的测量方法
CN120668522A (zh) * 2025-08-22 2025-09-19 广东开放大学（广东理工职业学院） 一种密度检测模块的测试系统及测试方法

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CN112294344A (zh) * 2019-07-30 2021-02-02 通用电气精准医疗有限责任公司 用于校正x射线成像中的x射线检测器倾斜的方法和系统
CN117471516A (zh) * 2023-08-21 2024-01-30 湖南华创医疗科技有限公司 束斑测试方法及装置
CN118533094A (zh) * 2024-05-16 2024-08-23 天津大学 一种透明薄壁器件三维轮廓及壁厚的测量方法
CN118533094B (zh) * 2024-05-16 2024-11-26 天津大学 一种透明薄壁器件三维轮廓及壁厚的测量方法
CN120668522A (zh) * 2025-08-22 2025-09-19 广东开放大学（广东理工职业学院） 一种密度检测模块的测试系统及测试方法
CN120668522B (zh) * 2025-08-22 2025-10-28 广东开放大学（广东理工职业学院） 一种密度检测模块的测试系统及测试方法

Also Published As

Publication number Publication date
WO1991002320A1 (fr) 1991-02-21
US5128864A (en) 1992-07-07
US5307264A (en) 1994-04-26
CA2060181C (fr) 2000-01-18
JPH04507210A (ja) 1992-12-17
AU649409B2 (en) 1994-05-26
AU6288690A (en) 1991-03-11
EP0486591A1 (fr) 1992-05-27

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