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Background: During breast three fields radiotherapy, the problem is that the divergency of the field interferes with matching the edges. So the matching point of these supraclav and tangential field will suffer from over-dose and under-dose. To prevent these these divergency, a half- block is often applied at supracluv field. Also in some techniques like collimator and couch rotation, corner bl...
Established approaches to design and evaluate usable systems are challenged by systems for wearable, handheld, or mobile devices. There are extensive methods and guidelines that describe how the usability of stationary computer systems should be evaluated [4,6]. This is complemented with experimental evaluations of the relative strengths and weaknesses of different techniques [1,3]. However, in...
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