| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
An electromagnetic sensing system was developed to observe the position of multiple receiver coils attached to the surface of the articulatory organs. This system detects the receiver position by measuring signals induced from surrounding magnetic fields and by solving a set of simultaneous equations representing the predicted magnetic fields by using a dipole model of the transmitter coils. Previous studies report a noticeable increase in the position estimation error irrespective of small signal prediction error and the existence of non-uniqueness problem in the position estimation was hypothesized to be the cause of this problem. To resolve the problem, we optimized the alignment of the transmitter coils by maximizing the difference between the receiver signals for any pair of states in the measurement region and evaluated the alignment by performing computer simulations and actual measurement. As a result, measurement error was decreased from 1.58 mm to 0.40 mm.
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