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척추 전방전위증의 전산화 단층촬영 소견 : 협부형과 퇴행형의 비교
이종덕,변재영,Lee, Jong-Deok,Byun, Jae-Young 대한침구의학회 2000 대한침구의학회지 Vol.17 No.4
Objectives : To evaluate the findings useful for differential diagnosis and associated abnormaiities of isthmic spondylolisthesis and degenerative spondylolisthesis on CT. Materials and methods : We reviewed retrospectively the CT images of 65 patients who were diagnosed spondylolisthesis during 3 years period. Our technique was 5mm slices at 5mm intervals with gantry angle to parallel the interspaces. Also reformatted sagittal views were taken. 41 patients were isthmic spondylolisthesis and 24 patients were degenerative spondylolisthesis. Resuits : Isthmic spondylolisthesis. 1. Isthmic type was more common at L5-S1. 2. The degree of anterior displacement was grade I and II. 3. The plane of defect was more horizontal than the usual facet joint. 4. The defect had an irregular shape. 5. Medial aspect of bone just anterior to defect had a small round prominence. 6. Anteroposterior elongation of the spinal canal was common. 7. Pseudobulging disk was common. 8. The most common associated abnormality was a HNP at the upper level of the defect. Degenerative spondylolisthesis. 1. Degenerative type was more common at L4-5. 2. The degree of anterior disptacement was grade I and II. 3. The Plane of facet joint was oriented obliquely instead of horizontally. 4. The posterior facet(inferior facet of superior vertebra) was anteriorly displaced. 5. Bony spur of the posterior portion of anterior facet was seen. 6. The facet joints often contain gas(vaccum phenomenum). 7. The most common associated abnormality was a HNP at the level of the displacement. Conclusions : CT is a highly accurate and most sensitive technique for recognition, differential diagnosis of isthmic and degenerative types and the detection of associated abnormalities.
이종덕 ( Lee Jong Deok ),변재영 ( Byun Jae Young ),권영달 ( Kwon Young-Dal ) 대한한의학회 한방재활의학과학회 1998 한방재활의학과학회지 Vol.8 No.2
저자들은 신경방사선학적 검사로 척수공동증과 소뇌의 하방전위를 동반 한 Arnold-Chiari malformation 제1형을 침구치료, 물리치료 및 약물치 료하여 상지무력이 약 40% 회복되어 문헌고찰과 함께 이를 보고하는 바이다.
MnO2가 첨가된 PSN-PNN-PT 세라믹스의 유전 및 압전특성
이종덕 ( Jong Deok Lee ) 한국센서학회 2004 센서학회지 Vol.13 No.2
N/A The dielectric and piezoelectric properties of 0 36Pb(Sc_(1/2)Nb_(1/2))O₃- 0.25Pb(Ni_(1/3)Nb_(1/2))O3-0.39PbTiO₃(hereafter PSNNT) at the morphotropic phase boundary (MPB) composition were investigated with 0-2.5 mot% MnO₂ doping. Bulk density, dielectric loss and tetragonality of crystal structure were all improved with increasing MnO₂ additive content. With increasing MnO₂ additive content, the electromechanical coupling factor and quality factor were also increased: Electromechanical coupling k_(p) and quality factor Q_(m) at 2.0 mol% MnO₂ doping with were showed highest values of 55.6 % and 252, respectively.