Development of non-contact, unconstrained, motion-free PET system using inexpensive measuring equipment

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K18376
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Biomedical engineering/Biomaterial science and engineering; Medical Physics and Radiological Technology
• Research Institution: National Institutes for Quantum and Radiological Science and Technology
• Principal Investigator: Iwao Yuma 国立研究開発法人量子科学技術研究開発機構, 放射線医学総合研究所 先進核医学基盤研究部, 研究員(任非) (40758330)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: PET / 体動補正 / モーショントラッキング / ICP

Outline of Final Research Achievements

In this research, we have developed a unconstrained motion-free PET system by a marker-less, non-contact motion measurement in a helmet-type PET device specialized for head examination, which we are developing. The development contents are shown below. 1. Development of non-contact markerless motion measurement system using Kinect (Microsoft). 2. Development of Kinect and PET coordinate matching method using surface shape of attenuation correction map. 3. Development of PET image reconstruction system with motion correction
Based on the above results, an experiment using a phantom was performed, and it was confirmed that the resolution of PET images was improved by the Wobbling effect as a result of correct body motion correction.

Free Research Field

画像処理

Academic Significance and Societal Importance of the Research Achievements

従来のPET検査では，体動は高解像度な画像を取得するために大きな弊害であった．そのため，被験者が意識的に，またはゴムバンド等を用いた拘束により体動を抑制する必要があり，10数分に及ぶ検査において被験者の負担増につながっていた．
本研究成果により，体動が生じている場合においても，適切な体動補正を行うことで解像度を落とすことなく，むしろ静止状態よりも高解像度な画像を取得できることが示された．これにより，被験者は撮像中ある程度自由に動くことが許容されるため，撮像時のストレスを大きく軽減することが可能である．