为解决这个问题，提出了一类可以抑制探测器响应不一致性，从而能消除环状伪影的扫描采样方式；
In order to mitigate this situation, a class of scan sampling patterns was proposed, which could suppress the non_uniform response and consequently decrease the ring artifacts.
目的总结探讨颅内环状强化转移瘤在超低场强MRI增强扫描的特点。
Objective To summarize and discuss the characters of intracranial ring-enhanced metastatic tumors enhancedly scanned by MRI with ultra-low field.
详细地分析了扫描图像产生环状伪影的原因，叙述了查找及排除故障的过程。
Article analyses the cause of producing ring artifact of ct image in detail. Expanation of the procedure of check and elimination the artifact is written in the article.
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