Browsing by Author "Hassen,Imad B"
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Item Controlling Collimator Motion in Cobalt-60 Radiotherapy Machine by Converted Breathing Electrical Signal(Journal of Multidisciplinary Engineering Science and Technology, 2014) Omer,Mohammed A. Ali; Gar-elnabi,Mohamed E. M; Hassen,Imad B; Husain,ELtaher MThe respiration (Inhalation and Expiration) as physiological mechanism causes the internal human organs displaced partially away from the field size boundary area during radiotherapy; as the collimator of radiotherapy machine is fixed, hence the aim of the following study was to convert the breathing physiological motion into electric signal and further to set the collimator in real dynamic synchronized with breathing mechanism. With usage of pressure sensor; the mechanical motion of abdomen due to breathing has been converted into analog electrical signal in a real time sinusoidal mode, then with usage of a microcontroller; the analog signal has been converted to digital discrete sequence signals form with (0-5) volts {1100,0110,0011,1001}and {1001, 0011, 0110, 1100}, then these signals connected to the stepper motor in sequence form; via the driver circuit (ULN2003A) which link and gives enough voltage (0-12) volts to turn the stepper motor in clock wise direction (CW), in respect to signal {1100,0110,0011,1001} or counter clock wise (CCW), in respect to signal {1001, 0011, 0110, 1100} which is corresponding to collimator motion of radiotherapy machine (Co-60) in synchronized pattern to abdominal motion induced by breathing mechanism.Item Conversion of Abdominal Physiological Motion into Electrical Signal Using Pressure Sensor(International Journal of Science and Research, 2012) omer,Mohammed A. Ali; Hassen,Imad B; Husain, ELtaher M; Gar-elnabi,Mohamed EThe organs motion has been as a matter of challenge for radiation therapy experts; hence the aim of this study was to sense the abdominal motion during breathing and converted into electric signal in order to be mimic and synchronize the organ motion during radiotherapy. The integrated silicon pressure sensor MPX4250 has been constructed and the human breathing pressure has been probed by the sensor and converted into voltage: the generated voltage during inhalation increases from zero (0) volt up to about 5 volts as maximum and the correlation between breathing pressure and the generated volts shows the following equations: y = 0.02x + 0.26 (for inhalation) and: y = - 0.02x + 0.26 for (exhalation). The general breathing mechanism gives a saw tooth curve voltage that could be used to express a synchronized abdominal organs motion during radiotherapy.