问题 问答题 简答题

心肌代谢显像的基本原理是什么?适应证有哪些?

答案

参考答案:

空腹时正常心肌以脂肪酸为主要代谢底物,而心肌缺血时则表现为局部葡萄糖代谢的相对增高与脂肪酸代谢的明显降低。基于上述现象,应用18F-标记的脱氧葡萄糖及C或I标记的脂肪酸,检测心肌葡萄糖与脂肪酸在正常或异常状态下的代谢变化,可客观地反映心肌缺血的程度及范围,并有效鉴别坏死与缺血。

适应证:①冠心病的早期诊断;②严重缺血心肌存活的评估;③急性心肌梗死和不稳定性心绞痛的鉴别诊断;④心肌病的诊断;⑤糖尿病性心脏病的诊断。F-标记的脱氧葡萄糖及C或I标记的脂肪酸,检测心肌葡萄糖与脂肪酸在正常或异常状态下的代谢变化,可客观地反映心肌缺血的程度及范围,并有效鉴别坏死与缺血。

适应证:①冠心病的早期诊断;②严重缺血心肌存活的评估;③急性心肌梗死和不稳定性心绞痛的鉴别诊断;④心肌病的诊断;⑤糖尿病性心脏病的诊断。

完形填空

Directions:  Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

As infants, we can recognize our mothers within hours of birth. In fact, we can recognize the   小题1: of our mother’s face well before we can recognize her body shape. It’s   小题2:  how the brain can carry out such a function at such a young age, especially since we don’t learn to walk and talk until we are over a year old. By the time we are adults, we have the ability to distinguish around 100,000 faces. How can we remember so many faces when many of us find it difficult to   小题3:  such a simple thing as a phone number? The exact process is not yet fully understood, but research around the world has begun to define the specific areas of the brain and processes   小题4:  for facial recognition.

Researchers at the Massachusetts Institute of Technology believe that they have succeeded in   小题5:  a specific area of the brain called the fusiform face area (FFA), which is used only for facial recognition. This means that recognition of familiar objects such as our clothes or cars, is from   小题6:  in the brain. Researchers also have found that the brain needs to see the whole face for recognition to take place. It had been   小题7:  thought that we only needed to see certain facial features. Meanwhile, research at University College London has found that facial recognition is not a single process, but   小题8:  involves three steps. The first step appears to be an analysis of the physical features of a person’s face, which is similar to how we scan the bar codes of our groceries. In the next step, the brain decides whether the face we are looking at is already known or unknown to us. And finally, the brain furnishes the information we have collected about the person whose face we are looking at. This complex   小题9:  is done in a split second so that we can behave quickly when reacting to certain situations.

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