听骨链螺旋CT三维重建技术及初步临床应用-实用放射学杂志.PDF

2001 10 17 10 737 CT 齐乃新, 师莉芳,白芝兰, 孙泓泓, 万佩明 ( CT/MR , 710004) : CT CT ( : 1. 0 mm) , Pitch: 1.5,(FOV= 9.0 cm) , ( 0. 5mm) 22, 10 , 12 , (SS )- 200- 500 HU 100300 HU 10 , L , 12,3 1 ,3 , 1 2 2 3 21 CT , :; ;,X ; :R764.04 :A : 1002- 1671(2001) 10- 0737- 03 Spiral CT Three- dimensional Reconstruction of the Auditory Ossicular Chain and Its Preliminary Clinical Application QI Nai- xin,SHILi-f ang, BAI Zhi- lan, SUN Hong- hong, WAN Pei- ming (Department of CT MR, the Second Hospital,Xi! anJiaotong University ,Xi! an 710004, China) ABSTRACT:Objective To assess the clinical application and limitation of 3- spiral CT of the auditory ossicular chain. Methods Spiral CT scan of the middle ear was performedwith 1.0 mm slice thickness at pitch 1.5, 9.0 cm filed of view,and 0.5 mm reconstruction interval in 10 nomal subjects and 12 patients with middle ear diseases.With the shaded surface display( SS ) 3- reconstruction of the auditory ossicular chain were done in all the patients, and the threshold values for normal and abnormal auditory ossicular chain were- 200500HU and 100300HU,respec tively. Results In 10 subjects with normal ossicular chain 3- reconstruction images could directly display shapes, sizes and correlation of malleus and incus,and the incusstapedial joint was like L structure,but it was difficult to exhibit the footplate, and anterior and posterior crura of stapes.Of 12 abnormal cases, in 3 cholestesteatomatic cases with chronic otitis media,3- reconstruction images demonstrated destructions of varying degrees that were in accord with those seen in operation. 1 casewith granulomas,2 cases with simple type otitis media and 2 cases of tem