Audiovisual biofeedback improves image quality and reduces scan time for respiratory-gated 3D MRI

17th International Conference on the Use of Computers in Radiation Therapy

物理学;计算机科学

Lee, D.^1 ; Greer, P.B.^2,3 ; Arm, J.^4 ; Keall, P.^1 ; Kim, T.^1,5

Radiation Physics Laboratory, Sydney Medical School, University of Sydney, Camperdown, NSW, Australia^1

University of Newcastle, Newcastle, NSW, Australia^2

Calvary Mater Newcastle, Newcastle, NSW, Australia^3

Hunter New UK Health Service, NSW Australia, Newcastle, Australia^4

Radiological Physics, University of Virginia Health System, Charlottesville, United States^5

关键词: Anatomic information;    Free breathing;    Healthy humans;    Motion artifact;    Motion management;    Reproducibilities;    Respiratory motions;    Root Mean Square;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/489/1/012033/pdf
DOI  :  10.1088/1742-6596/489/1/012033

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The purpose of this study was to test the hypothesis that audiovisual (AV) biofeedback can improve image quality and reduce scan time for respiratory-gated 3D thoracic MRI. For five healthy human subjects respiratory motion guidance in MR scans was provided using an AV biofeedback system, utilizing real-time respiratory motion signals. To investigate the improvement of respiratory-gated 3D MR images between free breathing (FB) and AV biofeedback (AV), each subject underwent two imaging sessions. Respiratory-related motion artifacts and imaging time were qualitatively evaluated in addition to the reproducibility of external (abdominal) motion. In the results, 3D MR images in AV biofeedback showed more anatomic information such as a clear distinction of diaphragm, lung lobes and sharper organ boundaries. The scan time was reduced from 401±215 s in FB to 334±94 s in AV (p-value 0.36). The root mean square variation of the displacement and period of the abdominal motion was reduced from 0.4±0.22 cm and 2.8±2.5 s in FB to 0.1±0.15 cm and 0.9±1.3 s in AV (p-value of displacement