A Fundamental Study on the Effect of Applying Intelligent Grid to Medical Images

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  • Kudo Kohsei
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences
  • Osanai Minoru
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences
  • Tsushima Megumi
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences
  • Hirota Junichi
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences
  • Murakami Sho
    Department of Radiology, Hirosaki University School of Medicine and Hospital
  • Naraki Satoshi
    Department of Radiology, Hirosaki University School of Medicine and Hospital
  • Suzaki Katsumasa
    Department of Radiology, Hirosaki University School of Medicine and Hospital
  • Aoki Masahiko
    Department of Radiology, Hirosaki University School of Medicine and Hospital Department of Radiation Oncology, Hirosaki University Graduate School of Medicine
  • Hosokawa Yoichiro
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences

Bibliographic Information

Other Title
  • 医用画像に寄与する Intelligent-Grid（ インテリジェントグリッド） 適用効果に関する基礎的検討
  • イヨウ ガゾウ ニ キヨ スル Intelligent-Grid(インテリジェントグリッド)テキヨウ コウカ ニ カンスル キソテキ ケントウ

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Description

Intelligent Grid （IG） is a technique to virtually reproduce the real grid （RG） in medical imaging to improve both contrast and graininess. Application of IG eliminates the unevenness in density often seen in images of RGs due to X-ray inclination. Although IG is expected in bedside radiography, the effect for grid ratios of IG is not clear. Therefore, we measured the scattered radiation content（ SRC）, contrast, and contrast-to-noise ratio（ CNR） in a phantom experiment. Results of the experiment confirmed a decrease in the SRC with application of IG. The contrast was confirmed to be improved compared to without the grid （WG） at all grid ratios （IG3:1, IG6:1, IG8:1） at 70 kV assuming the abdomen and at IG3:1 at 90 kV assuming the chest. However, the contrast of IG6:1 and IG8:1 at 90 kV was lower than that of WG. Furthermore, the CNR was found to be improved compared to WG at all grid ratios at a phantom thickness of 30 cm, at the same level at 20 cm, and at the same level or lower at 10 cm. These results demonstrate the need to apply IG according to the tube voltage and body thickness.

Journal

  • Hirosaki Medical Journal

    Hirosaki Medical Journal 69 (1-4), 35-43, 2019-03-15

    Hirosaki University Graduate School of Medicine,Hirosaki Medical Society

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