X-ray Imaging Application

(X線画像応用)

X-ray tomosynthesis from images obtained in free imaging geometry

Kohei Sato(M2)

Tomosynthesis is attracting attention as a low dose tomography technology compared with the X-ray CT. However, conventional tomosynthesis imaging devices as well as X-ray CT devices are still large and stationary. Furthermore, there is a limitation in the working range of X-ray source during the image acquisition. In this study, we propose to use a portable X-ray device that is widely used for round and emergency medicine. Tomosynthesis using a portable X-ray device requires the calibration of the geometric relationship between the X-ray source and the detector at each image acquisition. Such tomosynthesis with a free imaging geometry also requires an iterative reconstruction. We present an image processing-based calibration method using an asymmetric and multi-layered calibration object attached to the X-ray source housing. We then utilize an iterative image reconstruction method.
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外部発表リスト:

学会発表

  1. 佐藤康平,大西峻,羽石秀昭:自由な撮影ジオメトリで得た画像群からのX線トモシンセシス, 第34回 日本医用画像工学会大会, PP-2, 金沢歌劇座(2015.7.30-8.1)

Respiratory synchronized roadmap by use of respiratory phase matching between angiography obtained after inserting catheter and intraoperative fluoroscopy

Yuya Takano (graduated)

Intervention with a catheter is conducted under X-ray fluoroscopy. In this intervention, angiography and digital subtraction angiography (DSA) are conducted to enhance blood vessels. However, displacement and transformation of vessels caused by respiration are not considered in DSA because an image for only one phase can be acquired during breath holding. In this study, we propose a new method for generating a vessel roadmap corresponding to all respiratory phases and synchronizing with fluoroscopy by using a pattern matching between angiography after inserting catheter under natural respiration and intraoperative fluoroscopy. .
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共同研究者:キヤノン

外部発表リスト:

学会発表

  1. 高野裕也,菅沼昭平,大西峻,加藤英幸,大岡美彦,羽石秀昭:呼吸位相の合った造影・非造影透視像の組み合わせによる自然呼吸下血管カテーテル誘導,P2-11,情報フォトニクス研究会,電気通信大学(2014.3.4)
  2. 高野裕也,菅沼昭平,大西峻,加藤英幸,大岡美彦,羽石秀昭:術直前の血管造影を用いた呼吸性同期ロードマップの生成,O-14,日本医工学治療学会第30回学術大会,ウインクあいち(2014.3.22)
  3. Y. Takano, S. Suganuma, T. Ohnishi, H. Kato, Y. Ooka, H. Haneishi:Catheter Roadmap display under natural respiration by use of diaphragm region, S-50, CARS(Computer Assisted Radiology and Surgery)2014 28th International Congress and Exhibition, Vol.9, Supplement No.1, Fukuoka Convention Center, Fukuoka, Japan, June 25-28, 2014

Three-dimensional respiratory deformation processing for CT vessel image using angiographic images during a respiratory cycle

Shohei Suganuma (graduated)

In interventional radiology, physician inserts a catheter into blood vessels and forwards it to a target region under fluoroscopy monitoring to perform the diagnosis and treatment. However, since the vessels are deformed due to respiratory motion, the guidance of catheter is often difficult especially for novice physicians. On the other hand, CT image is also used for understanding the three-dimensional structure of blood vessels in addition to fluoroscopy. However, such a CT image does not have the respiratory motion. In this study, we propose to generate CT images with respiratory deformation from the 2D/3D registration between a preoperative CT image and continuous angiographic images acquired intraoperatively under natural respiration.
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共同研究者:キヤノン

外部発表リスト:

学会発表

English