目的：探讨CT能谱成像不同评估参数在肝细胞癌与肝转移瘤间的差异。方法回顾性分析行能谱CT 三期对比剂增强扫描的肝肿瘤患者31例（肝细胞癌15例，肝转移瘤16例），分别在三期能谱图像上对病灶边缘与腹主动脉、门静脉及下腔静脉的能谱...目的：探讨CT能谱成像不同评估参数在肝细胞癌与肝转移瘤间的差异。方法回顾性分析行能谱CT 三期对比剂增强扫描的肝肿瘤患者31例（肝细胞癌15例，肝转移瘤16例），分别在三期能谱图像上对病灶边缘与腹主动脉、门静脉及下腔静脉的能谱参数进行测量，并计算50～70keV下的标准化CT 值、标准化碘（水）浓度、铁（水）浓度、水（碘）浓度、有效原子序数、能谱曲线斜率及动静脉碘浓度差等。分析肝细胞癌与肝转移瘤之间、肝细胞癌转移灶与肝转移瘤之间各测量和统计参数的差异。结果肝细胞癌组在门脉期50、60、70keV 下 CT 值分别为142．500±29．106、112.010±20．864、93．727±15．331，碘浓度值为17．235±5．089（100ug／ml），有效原子序数为8．594±0．266，明显高于肝转移瘤组，并具有统计学差异（ P ＜0．05），且门脉期较动脉期差异更为明显。肝细胞癌转移灶组与肝转移瘤组相比较，50～70keV下的CT值、碘（水）浓度、铁（水）浓度、水（碘）浓度、有效原子序数及标化后CT值、标准化碘（水）浓度、铁（水）浓度、有效原子序数肝细胞癌转移灶组明显高于肝转移瘤组，也具有统计学差异（ P ＜0．05），且随着扫描时间延长，两组差异逐渐变小。结论肝细胞癌与肝转移瘤、肝细胞癌转移灶与肝转移瘤的C T 能谱成像具有不同的特征，低能量keV可以对两组病变进行定量鉴别。展开更多
The endothelial cells of the corneas of rabbits preserved by desiccation for vari-ous duration showed no hexagonal form of normal cells but broad bean-like nuclci afterdouble staining with alizarin red and trypan blue...The endothelial cells of the corneas of rabbits preserved by desiccation for vari-ous duration showed no hexagonal form of normal cells but broad bean-like nuclci afterdouble staining with alizarin red and trypan blue.Scanning electron microscopic examina-tion revealed interdigitation at the intercellular junction together with intercellularvacuoles and cellular edema.Transmission electron microscopic examination showedincomplete nuclear membrane,karyopyknosis,vacuoles and remnant organellae in thecytoplasm.Partial penetrating keratoplasties were done in 37 rabbits(37 eyes)with pre-served corneas.The grafts remained transparent for a minimum of 4 days to a maximumof over 1 year,and 7 grafts remained transparent for more than 30 days.Staining ofthe transparent grafts revealed normal hexagonal endothelial cells in mosaic arrange-ment.We assumed that after transplantation of the preserved cornea the endothelial cellsregained their activities owing to the nutrient effect of the aqueous humor.展开更多
The mean length of the stria vascularis (SV) and the basilar membrane of four normalguinea pigs measured by means of surface preparation was 21.11 mm and 19. 90 mm respectively,and the mean width of their apical turns...The mean length of the stria vascularis (SV) and the basilar membrane of four normalguinea pigs measured by means of surface preparation was 21.11 mm and 19. 90 mm respectively,and the mean width of their apical turns of SV and the turns of the cochlear basis was 0. 44 mmand 0. 86 mm respectively. The ultrastructure of SV, spiral ligament (SL) and spiral prominence(SP) of both ears of eight guinea pigs were observed by scanning electron microscopy(SEM) andtransmission electron microsoopy(TEM). There were a large number of coated vesicles in thesupranuclear region of SV, some opened to the endolymph. A great number of folding cytoplasmicprojections were filled with small vesicles The capillary network was extremely rich indicating thatthe endolymph could be secreted and absorbed by SV. The cellular conjunction in the SV. SL andSP formed an effective barrier. It has not been proved in this study that the melanin offers resistanceto acoustic stimulation.展开更多
文摘目的：探讨CT能谱成像不同评估参数在肝细胞癌与肝转移瘤间的差异。方法回顾性分析行能谱CT 三期对比剂增强扫描的肝肿瘤患者31例（肝细胞癌15例，肝转移瘤16例），分别在三期能谱图像上对病灶边缘与腹主动脉、门静脉及下腔静脉的能谱参数进行测量，并计算50～70keV下的标准化CT 值、标准化碘（水）浓度、铁（水）浓度、水（碘）浓度、有效原子序数、能谱曲线斜率及动静脉碘浓度差等。分析肝细胞癌与肝转移瘤之间、肝细胞癌转移灶与肝转移瘤之间各测量和统计参数的差异。结果肝细胞癌组在门脉期50、60、70keV 下 CT 值分别为142．500±29．106、112.010±20．864、93．727±15．331，碘浓度值为17．235±5．089（100ug／ml），有效原子序数为8．594±0．266，明显高于肝转移瘤组，并具有统计学差异（ P ＜0．05），且门脉期较动脉期差异更为明显。肝细胞癌转移灶组与肝转移瘤组相比较，50～70keV下的CT值、碘（水）浓度、铁（水）浓度、水（碘）浓度、有效原子序数及标化后CT值、标准化碘（水）浓度、铁（水）浓度、有效原子序数肝细胞癌转移灶组明显高于肝转移瘤组，也具有统计学差异（ P ＜0．05），且随着扫描时间延长，两组差异逐渐变小。结论肝细胞癌与肝转移瘤、肝细胞癌转移灶与肝转移瘤的C T 能谱成像具有不同的特征，低能量keV可以对两组病变进行定量鉴别。
文摘The endothelial cells of the corneas of rabbits preserved by desiccation for vari-ous duration showed no hexagonal form of normal cells but broad bean-like nuclci afterdouble staining with alizarin red and trypan blue.Scanning electron microscopic examina-tion revealed interdigitation at the intercellular junction together with intercellularvacuoles and cellular edema.Transmission electron microscopic examination showedincomplete nuclear membrane,karyopyknosis,vacuoles and remnant organellae in thecytoplasm.Partial penetrating keratoplasties were done in 37 rabbits(37 eyes)with pre-served corneas.The grafts remained transparent for a minimum of 4 days to a maximumof over 1 year,and 7 grafts remained transparent for more than 30 days.Staining ofthe transparent grafts revealed normal hexagonal endothelial cells in mosaic arrange-ment.We assumed that after transplantation of the preserved cornea the endothelial cellsregained their activities owing to the nutrient effect of the aqueous humor.
文摘The mean length of the stria vascularis (SV) and the basilar membrane of four normalguinea pigs measured by means of surface preparation was 21.11 mm and 19. 90 mm respectively,and the mean width of their apical turns of SV and the turns of the cochlear basis was 0. 44 mmand 0. 86 mm respectively. The ultrastructure of SV, spiral ligament (SL) and spiral prominence(SP) of both ears of eight guinea pigs were observed by scanning electron microscopy(SEM) andtransmission electron microsoopy(TEM). There were a large number of coated vesicles in thesupranuclear region of SV, some opened to the endolymph. A great number of folding cytoplasmicprojections were filled with small vesicles The capillary network was extremely rich indicating thatthe endolymph could be secreted and absorbed by SV. The cellular conjunction in the SV. SL andSP formed an effective barrier. It has not been proved in this study that the melanin offers resistanceto acoustic stimulation.
