Fetal movement is an indicator of well-being. If the fetus does not move for a certain number, it may indicate a pregnancy risk. Acceleration measurement is a popular technique for detecting the vibration due to the movement. However, the comparison to use acceleration with other techniques e.g. fetal-movement sound has not been performed to date. In this study, acceleration sensors and MEMS microphones were used to detect three actions performed on the subject’s abdomen: flicking, tapping, and knocking with finger(s), and two activities without performing these actions: subject speaking and walking. These actions and activities were carried on a female healthy subject in order to simulate the actions due to fetal movement. The maximum accuracy of the use of acceleration sensors was 69.96 % for the tapping action; while that of MEMS microphones was 71.11% for the flicking action. The very poor accuracy was found for the knocking action with using MEMS microphones, i.e. 31.11%. Using the MEMS microphones was very robust to the interference from speaking and walking, while using the acceleration sensors was very susceptible to walking. Therefore, to develop a device for counting fetal movement, employing both sensors would be recommended in order to sense various types of movement.
[1]
Shigeko Horiuchi,et al.
A long-term monitoring of fetal movement at home using a newly developed sensor: an introduction of maternal micro-arousals evoked by fetal movement during maternal sleep.
,
2008,
Early human development.
[2]
Kyoko Nishihara,et al.
A new method for long-term home monitoring of fetal movement by pregnant women themselves.
,
2012,
Medical engineering & physics.
[3]
Wei Wu,et al.
A new method for fetal movement detection using an intelligent T-shirt embedded physiological sensors
,
2015,
2015 IEEE 16th International Conference on Communication Technology (ICCT).
[4]
H.P. van Geijn,et al.
A transducer for detection of fetal breathing movements
,
1989,
IEEE Transactions on Biomedical Engineering.