| Project/Area Number |
04404047
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Radiation science
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| Research Institution | Shinshu University |
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Principal Investigator |
SONE Shusuke Shinshu Univ., School of Med., Professor, 医学部, 教授 (80028480)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Jun Shinshu Univ. Hospital, Staff, 医学部・附属病院, 助手 (80212364)
IMAI Yutaka Shinshu Univ. Hospital, Staff, 医学部・附属病院, 助手 (30020902)
SAKAI Fumikazu Shinshu Univ., School of Med., Assist. Prof, 医学部, 講師 (30153852)
KASUGA Toshio Shinshu Univ., Hospital., Assist. Prof, 医学部・附属病院, 講師 (50020756)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥26,000,000 (Direct Cost: ¥26,000,000)
Fiscal Year 1993: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1992: ¥22,000,000 (Direct Cost: ¥22,000,000)
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| Keywords | multi-directional tomograph / digital tomosynthesis / image processing / spatial frequency filtration / dual energy subtraction / blurred mask layr subtraction / digital radiography / angiotomosynthesis / X線画像処理 / 空間フィルタリング法 / ボケ断層像差分法 |
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| Research Abstract |
We have developed a digital tomosynthesis system, which incorporates an x-ray fluororadiographic TV unit and has the capabilities to perform multi-directional tomography and to expose pulsed x-rays with rapid kV switching between low energy and high energy, a digital image processing unit and display unit, including a high-resolution CRT monitor and a lase printer. We have studied the methods of re-constructing digital tomographs of multilayrs, utilizing image data obtained from a single multi-directional tomographic movement, and of improving image quality of those reconstructed tomographs by means of several digital image processing techniques. The basic processing technique in our system was spatial frequency filtration, although dual energy and blurred mask layr-subtractions were the optional techniques and showed the distinct advancements shown in this study. Clinical applications of this modality has proved a number of advantages as listed below :
1) Longitudinal format of the reconstructed tomographs facilitated an easy interpretation of the tomographs and helped comparison against conventional radiographs
2) Digital reconstruction of multiple tomographs from a single set of tomographic image data shortened examination time and lowered patient radiation exposure. Moreover it helped three-dimensional recognition of the object when multiple tomographs were displayd on a CRT in cine mode
3) Image processing was effective to improve image quality of the tomograph and enhanced some specific image informations pertinent to the clinical problem at hand
4) Dual energy subtraction digital tomosynthesis was effective to clearly demonstrate bony structures or a small calcification in the lesion and permitted discrimination of calcifications from dense fibrotic lesions
5) Digital angiotomosynthesis permitted a detailed observation of vascular disorders and was promising for dynamic vascular study
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