| Project/Area Number |
13671964
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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 |
病態科学系歯学(含放射線系歯学)
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| Research Institution | Niigata University |
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Principal Investigator |
TANAKA Ray (2003-2004) Niigata University, Medical and Dental Hospital, Assistant, 医歯学総合病院, 助手 (30323992)
小林 富貴子 (2002) 新潟大学, 大学院・医歯学総合研究科, 助手 (00153635)
伊藤 寿介 (2001) 新潟大学, 大学院・医歯学総合研究科, 教授 (50018371)
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| Co-Investigator(Kenkyū-buntansha) |
KOYAMA Jun-ichi Niigata University, Medical and Dental Hospital, Assistant, 医歯学総合病院, 助手 (40283022)
TAIRA Shuhzou Niigata University, Graduated school of Medical and Dental Science, Assistant, 大学院・医歯学総合研究科, 助手 (70313525)
田中 礼 新潟大学, 歯学部附属病院, 助手 (30323992)
小林 富貴子 新潟大学, 大学院・医歯学総合研究科, 助手 (00153635)
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| Project Period (FY) |
2001 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2004: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2003: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | multidetector-row CT / helical CT / radiation exposure / volume data / three-dimensional image / diagnostic imaging system / data storage / helical pitch / 放射線被曝 / CTDIw / DLPw / 螺旋型CT装置 / 造影剤 / time density curve / 三次元立体画像 / 被爆量測定 |
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| Research Abstract |
This study was carried out mainly to make clear the optimal scanning conditions in clinical appliance of multidetector-row CT in the maxillo-facial region. Thinking of the appliance to evaluation of bone change of temporomandibular joint(TMJ) in the patients with jaw deformity or temporomandibular joint disorder, the region of TMJs of the phantom was scanned in several conditions. CT data obtained from every scanning was reconstructed in the different reconstruction interval of 4, then multi planar reconstruction(MPR) images were made with the reconstructed images. Coronal and sagittal images of MPR was used to estimate better imagse to evaluate bone in TMJ, the most suitable combination of the conditions i.s. tube current, helical pitch, reconstruction function, and reconstruction interval.
Optimal scanning protocol of the region of TMJs was considered as follows.
Scanning range : 50mm of the region of TMJ in the phantom (constant condition)
Tube potential : 120kV (constant condition)
CT beam collimation : 1.25mm (constant condition)
Tube current : 80mA (inconstant condition)
Helical pitch : 3 (inconstant condition)
Reconstruction interval : 0.25mm (inconstant condition)
In the combination of the conditions as above, scanning time, computed tomography dose index(CTDI), and dose-length product(DLP) were 14.8 seconds, 25.08mGy, and 139.15mGycm, respectively. Comparing images in the same condition of reconstruction interval, it might be suggested that tube current was not always effect on the ease of observation of images. It could be considered that reconstruction interval is more effective to make clear MPR images.
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