1998 Fiscal Year Final Research Report Summary
X-ray spectra analysis from K-absorption edge to maximum energy for the improvement of IVR low-contrast
| Project/Area Number |
09670919
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | Kanazawa University |
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Principal Investigator |
KOSHIDA Kichiro Faculty of Medcine, Kanazawa University Associate professor, 医学部, 助教授 (90020023)
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| Project Period (FY) |
1997 – 1998
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| Keywords | IVR / K-absorption edge / improvement of low-contrast |
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| Research Abstract |
A examination of X-ray spectra analysis for the improvement of clinical technique and X-ray equipment was conducted.
(1)A comparison of X-ray spectrum of the water and acrylic resin showed that the X-ray transisslon ratio of acrylic resin was high for low energy resions, and low for high energy resions. This constitutes a sonsiderable problem when acrylic resin is used.
(2)When filters made of aluminum, copper, niobium and molybdenum were Inserted, It was found that the attenuation ratios could be obtained with these filters as If the attenuation ratio was ca1culated by using mass attenuation coefficients (which have been suggested by Hubbell) without stripping correction. The addition of the Nb and Mo filters reduced In the photons of lower X-ray energy, and transmitted the photons of high-energy X-rays. The addition of the Al filter tended to have the effect, but less evident, while the effect of the Cu filter was between that of Nb or Mo and of Al.
(3)The X-ray transmission, ratio of the screen was also measured. For the range from 40 keV to 70 keV, the orthochromatic screen should reduced the photons of X-ray, - but for anly other range the regular screen should reduced the photons.
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