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Development of a cardiac evaluation method using a dynamic flat-panel detector (FPD) system: a feasibility study using a cardiac motion phantom

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Abstract

The purpose of this study is to investigate the feasibility of cardiac evaluation with a dynamic flat-panel detector (FPD), based on changes in pixel values during cardiac pumping. To investigate the feasibility of cardiac evaluation with a dynamic flat-panel detector (FPD), based on changes in pixel values during cardiac pumping. Sequential radiographs of a cardiac motion phantom and water-equivalent material step were obtained with an FPD system. Various combinations of cardiac output and heart rate were evaluated with and without contrast medium. The ventricular area and summation of pixel values in the ventricles were measured. The ejection fraction (EF) was calculated based on the rate of changes and then compared to EF obtained from computed tomography images. In addition, slight changes in pixel values were visualized by use of inter-frame subtraction and color-mapping. The result of a clinical case was examined according to cardiac physiology. There were strong correlations between EF and our results. There was no significant difference between the findings with and without contrast medium. When the heart rate was greater than 60 bpm, EF obtained with our method were underestimated. It is necessary for a patient to be examined at an imaging rate between 7.5 and 10 fps at least. In addition, a ±1.2% change in pixel value was equivalent to a ±10 mm change in the thickness of water. Color-mapping images were supported by cardiac physiology. Evaluating changes in pixel values on dynamic chest radiography with FPD has the potential to demonstrate cardiac function without contrast medium. Inter-frame subtraction and color-mapping are very useful for interpreting changes in pixel value as velocities of blood flow.

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Acknowledgments

This work was supported in part by the Nakashima Foundation, Japan Science and Technology Agency, and a Grant-in-Aid for Scientific Research from the Japanese Ministry of Education, Culture, Sports, Science, and Technology: Intelligent Assistance in Diagnosis of Multi-dimensional Medical Images. The authors thank Yoshinori Uebayashi, Takahiro Gotou, Toshinori Sekitani, and Kazushige Asano at the Department of Radiological Technology, School of Health Sciences, Fujita Health University, who assisted in the phantom study, and Kazuya Nakayama, PhD, Department of Radiological Technology, Kanazawa University, and Norio Hayashi and the technologists of the Department of Radiology, Kanazawa University Hospital, who assisted with data acquisition.

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Authors and Affiliations

  1. Department of Quantum Medical Technology, Graduate School of Medical Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, 920-0942, Japan

    Rie Tanaka & Shigeru Sanada

  2. Department of Radiological Technology, School of Health Sciences, Fujita Health University, 1-98 Dengakugakubo, Kutsukake, Toyoake, 470-1192, Japan

    Katsumi Tsujioka

  3. Department of Radiology, Kanazawa University Hospital, 13-1 Takaramachi, Kanazawa, 920-8641, Japan

    Takeshi Matsui & Tadanori Takata

  4. Department of Radiology, Graduate School of Medical Science, Kanazawa University, 13-1 Takaramachi, Kanazawa, 920-8641, Japan

    Osamu Matsui

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  1. Rie Tanaka
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  2. Shigeru Sanada
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  3. Katsumi Tsujioka
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  4. Takeshi Matsui
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  5. Tadanori Takata
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  6. Osamu Matsui
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Correspondence to Rie Tanaka.

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Tanaka, R., Sanada, S., Tsujioka, K. et al. Development of a cardiac evaluation method using a dynamic flat-panel detector (FPD) system: a feasibility study using a cardiac motion phantom . Radiol Phys Technol 1, 27–32 (2008). https://doi.org/10.1007/s12194-007-0003-0

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  • DOI: https://doi.org/10.1007/s12194-007-0003-0

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