单选题
射线束硬化伪影出现的原因是（）
发布日期：2020-12-11
射线束的吸收误差
杯状伪影的结果
CT机的线性误差
CT机的均匀性不良
尖峰伪影的结果
试题解析
线束硬化
线束硬化（beam hardening）是2020年公布的医学影像技术学名词。
- 中文名
- 线束硬化
- 所属学科
- 医学影像技术学
- 外文名
- beam hardening
- 公布时间
- 2020年
伪影
伪影(Artifacts)是指原本被扫描物体并不存在而在图像上却出现的各种形态的影像。伪影大致分为与患者有关和与机器有关的两类。
- 中文名
- 伪影
- 形成
- 设备或病人造成的
- 外文名
- Artifacts
- 分类有
- 运动伪影
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Passage 4Questions 34 - 45 ● Read the article below about stock exchange. ● In most of the lines 34 - 45 there is one extra word. It is either grammatically incorrect or does not fit in with the sense of the text. Some lines, however, are correct. ● If a line is correct, write CORRECT on your Answer Sheet. ● If there is an extra word in the line, write the extra word in CAPITAL LETTERS on your Answer Sheet. ● The exercise begins with two examples, (0) and (00) 0. The London Stock Exchange has always been famous as a place for men only, and women 00. used to be strictly forbidden to enter in. But the world is changing day by day, and even the 34. Stock Exchange, which seemed to be a man’s castle, is being gradually opening its doors to the 35. other sex. On 16th November 1971, a great decision was taken out. The Stock Exchange 36. Council (the body of men that administers the Stock Exchange) decided that women be 37. allowed to the new trading floor when it opened in 1973. But the “castle” had not been very 38. completely conquered. The first girls to work in “The House” were not brokers or jobbers. 39. They were neither allowed to be become partners in stocking firms, nor to be authorized dealers 40. in stocks and shares. They were simply junior clerks and telephone operators. Women all 41. have been trying to get into the Stock Exchange for many years. Several votes have been 42. taken in “The House” to see whether the members would be willing to allow many women 43. to become members, but the answer has always been “No”. There have been three refusals of 44. this kind since 1967. Now women are admitted, although they in a very junior capacity. 45. Actually, it is the only a matter of time, it will sure take place sooner or later.
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