Browsing by Author "Sobhani, Mohammad Rahim"

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Portable low cost ultrasound imaging system
(IEEE, 2016) Sobhani, Mohammad Rahim; Ozum, H. E.; Yaralıoğlu, Göksen Göksenin; Ergun, A. S.; Bozkurt, A.; Electrical & Electronics Engineering; YARALIOĞLU, Göksen Göksenin; Sobhani, Mohammad Rahim
The applications of ultrasound in medicine have been increasing in the last decade either in diagnostics or in treatments. Ultrasound is routinely used in clinical examinations, such as pregnancy exams. On the other hand, a typical ultrasound system costs somewhere between 100k$ to 250k$ because of its (1) expensive ultrasound transducers, (2) large driving electronics, (3) processing and visualization units. High cost and large volume of the ultrasound systems prevent even wider usage of these systems. It is possible to extent the use of ultrasound in clinic environment like a stethoscope, if the size and cost had been reduced orders of magnitude. The aim of this work is to develop an ultraportable and very low cost diagnostic ultrasound imaging probe; by combining inertial sensors with the probes. The manual motion of the probe by the operator's hand movement enables scanning. The position of the probe is tracked using inertial sensors. Finally, the acoustic reflections are registered together by the help of position information of the probe to form an image.
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Portable low cost ultrasound imaging system
(2015-08) Sobhani, Mohammad Rahim; Yaralıoğlu, Göksenin; Yaralıoğlu, Göksenin; Uğurdağ, Hasan Fatih; Bozkurt, A.; Department of Electrical and Electronics Engineering; Sobhani, Mohammad Rahim
The use of ultrasound in medicine has increased in the last decade either in diagnostics or in treatments. Ultrasound is safe and easy to use compared to other imaging methods, such as X-ray imaging. Various probes are used to image di erent body parts and internal organs. Probes usually employ a transducer array. Typically these transducer arrays have 64, 96 or 128 elements. While in use, each element of the transducer is driven by a dedicated beam former electronics in transmit an receive. A typical ultrasound system costs somewhere between $100K to $250K. Recently, low cost laptop computer based ultrasound systems have been developed to facilitate the common use of ultrasound devices. The cost reduction is achieved by reducing the channel count. However, even these systems are quite expensive, on the orders of $20K (except a few systems). This high cost limited the wide use of these systems. This thesis aims the design of a mechanically scanned hand-probe for ultrasound imaging with a signicantly reduced channel count (2-4 array elements). The operator will scan the organ to be imaged by the motion of his/her hand. The probe will consist of the transducer, inertial sensors and the driver electronics. While the probe is swung on the body of the patient, the movement of the probe in the 3D space will be monitored by inertial sensors. Acceleration and rotation data from the inertial sensor will be converted to location data by the use of a positioning algorithm (Quaternion estimator), and this data will then be used for the construction of the ultrasound image. This approach will signicantly simplify the transducer electronics and, hence, will reduce the system cost.