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问题 单项选择题

滤波反投影法的运算流程为（）

A.预处理－卷积－反投影

B.预处理－反投影－卷积

C.预处理－迭代－反投影

D.预处理－傅立叶变换－重建

E.预处理－傅立叶变换－反投影

答案

参考答案：A

解析：滤波反投影法先对每个投影值进行滤波再进行反投影计算，降低了算法复杂度。

单项选择题 案例分析题

患儿男，4岁，以发现小腿弯曲畸形及短缩2年之主诉入院。查体：小腿中1/3处向前弯曲畸形或假关节外形，患肢短缩。患儿局部一般无肿胀、疼痛等不适感，全身皮肤常有浅棕色斑。

该患者可能的X线表现不包括（）

A.胫骨下1/3处向前外侧弯曲

B.凹侧骨皮质增厚

C.骨髓腔狭窄

D.腓骨可有或无相应改变

E.胫骨下1/3处向后外侧弯曲
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单项选择题

At a basic level, cloud computing is simply a means of delivering IT resources as （）. Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration （）. Cloud computing began as large-scale Internet service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, （） distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on （） "somewhere on the Intemet" and the application runs on both the "cloud servers" and the user's browser. Both clouds and grids are built to scale horizontally very efficiently. Both are built towithstand failures of （） elements or nodes. Both are charged on a per-use basis. But while grids typically process batch jobs, with a defined start and end point, cloud servics can be continuous. What's more, clouds expand the types of resources available——file storage, databases, and Web services——and extend the applicability to Web and enterprise applications.

An architecture emerged: massively scaled, （） distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources.

A．horlzontally

B．vertically

C．inclined

D．decreasingly
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