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提高光纤成像系统传像质量的研究方法 被引量:1
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作者 吕恩奎 《电子设计工程》 2010年第10期157-159,共3页
针对提高超长异型光纤传像束系统的传像质量,提出一种研究方法,综合分析了光纤的排列、光纤填充系数、数值孔径以及后续图像合成算法。制造光纤时光纤束采用六角形的排列,使用折射率小的包层。在图像数据处理时,使用抽样定理、三次样条... 针对提高超长异型光纤传像束系统的传像质量,提出一种研究方法,综合分析了光纤的排列、光纤填充系数、数值孔径以及后续图像合成算法。制造光纤时光纤束采用六角形的排列,使用折射率小的包层。在图像数据处理时,使用抽样定理、三次样条图像信号重建和亚像元配准等图像处理算法,最终提高了光纤成像系统的传像质量。实验证明,通过信号的重建以及错位的校正等方法,能够有效地改善成像光纤束的传像质量。 展开更多
关键词 传像光纤束 数值孔径 三次样条 亚像元配准 传像质量
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Effect of erythromycin on image quality and transit time of capsule endoscopy: A two-center study 被引量:10
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作者 Eva Niv Ido Bogner +5 位作者 Olga Barkey Zamir Halpern Elisabeth Mahajna Roman Depsames Yael Kopelman Zvi Fireman 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第16期2561-2565,共5页
AIM: To compare the effect of oral erythromycin vs no preparation with prokinetics on the transit time and the image quality of capsule endoscopy (CE) in evaluating small bowel (SB) pathology. METHODS: We conducted a ... AIM: To compare the effect of oral erythromycin vs no preparation with prokinetics on the transit time and the image quality of capsule endoscopy (CE) in evaluating small bowel (SB) pathology. METHODS: We conducted a retrospective, blinded (to the type of preparation) review of 100 CE studies, 50 with no preparation with prokinetics from one medical center (Group A) and 50 from another center with administration of a single dose of 200 mg oral erythromycin 1 h prior to CE (Group B). Gastric, SB and total transit times were calculated, the presence of bile in the duodenum was scored, as was cleanliness within the proximal, middle and distal intestine. RESULTS: The erythromycin group had a slightly shorter gastric transit time (21 min vs 28 min, with no statistical significance). SB transit time was similar for both groups (all P > 0.05). Total transit time was almost identical in both groups. The rate of incomplete examination was 16% for Group A and 10% for Group B (P = 0.37). Bile and cleanliness scores in different parts of the intestine were similar for the two groups (P > 0.05). CONCLUSION: Preparation for capsule endoscopy with erythromycin does not affect SB or total transit time. It tends to reduce gastric transit time, but it does not increase the cecum-reaching rate. Erythromycin does not adversely affect image quality. We consider the routine use of oral erythromycin preparation as being unjustified, although it might be considered in patients with known prolonged gastric emptying time. 展开更多
关键词 Capsule endoscopy Gastric transit time Small bowel transit time ERYTHROMYCIN Image quality
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