Martin Cizek

Head position monitoring system design

Presented paper is focused on description of a system design for monitoring patient head after special ophthalmological operation called Vitrectomy. For optimal recovery a correct position of the head during recovery time is important. The designed system consists of a telemetric monitoring unit and communication unit. The monitoring unit provides periodical tilt sensing using the digital MEMS accelerometer. The tilt angle and corresponding time are stored in built-in memory. The patient is also warned by sound alarm when posture of head is incorrect. The second part of this system is communication unit which provides communication with the monitoring unit via wireless interface. This communication supports single or continual mode, so the measured data can be available immediately or after treatment period. The developed computer software application provides communication and makes it possible to set up the device before treatment and download the data during or after treatment. It is also designed for measured data analyzing. The described system helps the patient to keep a correct head position. Thanks to data logging it is also a powerful diagnostic tool for clinical specialists.

Software for automatic head position monitoring

The automatic head position monitoring system is designed for monitoring patient head after special ophthalmological operation called Vitrectomy. In the final phase of this operation a small amount of vitreous is replaced with a bubble of expansive gas or oil to push on recovering parts of the retina. Correct position of the head during recovery time is therefore important.

Acoustic Wave Equation Simulation Using FDTD

Full wave simulations provide a vivid tool for studying both the spatial and temporal nature of acoustic field. The paper deals with description of an example implementation of finite-difference time-domain method (FDTD) for ultrasound field full wave simulation. Presented solution is intended to be apart of software for ultrasound field modeling, currently in the state of development. As a model for the propagation of ultrasound, the Westervelt equation was used. Therefore, both linear and nonlinear propagation effects can be taken into account. Modeling of nonlinear ultrasound propagation is valuable for example in predicting of biological tissue heating due to gradual energy accumulation in higher order harmonics of the distorted ultrasound signal. This is not possible with common linear propagation models.

Head position monitoring system

Presented paper is focused on description of a developing system for monitoring patient head position after special ophthalmo-logical operation called vitrectomy. For optimal recovery a correct position of patients head during postoperative time is important.

MEMS technology in head tilt monitoring after vitreoretinal surgery

Presented paper is focused on a new developing device intended for monitoring of patients head position during the post-operative period after vitreoretinal surgery. Keeping the head in an optimal position after this operation is crucial for optimal results of the recovery process. Head tilt monitoring is a complicated task during the normal life. Described device is based on a modern micro-electro-mechanical systems (MEMS) acceleration sensor. MEMS sensors are used for sensing gravitational acceleration. A microcontroller is used for data processing, logging and controlling user interface.

Patients Head Position Monitoring

Presented paper deals with description of a device intended for use in patients head position monitoring after vitreoretinal surgery. Keeping the head in an optimum position during the post-operation period is crucial for the whole recovery process to proceed well. A device helping the patient in maintaining proper head position was developed. The design utilizes modern MEMS accelerometers and a powerful RISC microcontroller. The main effort led to designing a compact battery-powered device design capable of warning the patient in case of improper head position. Application of high-level programming language made the whole firmware development process as effective as possible.

Automatic head position monitoring for optimal recovery after vitrectomy

The system of automatic head position monitoring is designed for patient monitoring after an ophthalmologic surgery procedure called vitrectomy. The expansive gas bubble (SF6 or C3F8) or oil bubble is injected into operated eye to push on recovering parts. Correct position of the head during post-operative period is therefore important. Patient must keep his or her head in a defined position for several days or even weeks. Using traditional methods of postoperative investigation it has not been possible to objectively distinguish between complications caused by clinical factors and those caused by long term improper head posture.

Long-Term Head Posture Monitoring Reduces Complications Following Vitrectomy

Keeping the head of a patient in a certain position during the postoperative period lasting several days or even weeks is often necessary for optimal results of the recovery process following complicated ophthalmological operations such as vitrectomy. Using common techniques of investigation it has not been virtually possible to objectively distinguish postoperative complications caused by clinical factors from those caused by improper head positioning by the patient during the home treatment. Adjusting and improving surgical methods according to patient examinations therefore has not been a straightforward task.

Electronic Monitoring of Head Position after Vitrectomy

A developing electronic monitoring system is intended to help patients with maintaining an optimum head position during the recovery process after an ophthalmologic surgery procedure called vitrectomy. In the final phase of this operation a bubble of expansive gas (SF6 or C3F8) is injected into the eye to push recovering parts of the retina together. Positioning the head correctly for a period of several days or even weeks is then crucial for achieving optimal treatment results.

Blood Flow Detector Output Signal Digitalization

The digital demodulation of an acoustic indication signal generated by a simple Doppler continuous wave (CW) ultrasound blood flow detector is the topic of the presented work. Digital signal processing and digital data output significantly enhance capabilities of the ultrasound instrument. The main effort led to application of digital signal processing algorithms such as fast Fourier transform (FFT) and digital filtering in a signal processor with high computation power. Thanks to combination of a modern processor and an integrated development environment, testing of sophisticated algorithms written in the C programming language was possible very effectively.