Couch-based motion compensation: modelling, simulation and real-time experiments

Abstract The paper presents a couch-based active motion compensation strategy evaluated in simulation and validated experimentally using both a research and a clinical Elekta Precise Table™. The control strategy combines a Kalman filter to predict the surrogate motion used as a reference by a linear model predictive controller with the control action calculation based on estimated position and velocity feedback provided by an observer as well as predicted couch position and velocity using a linearized state space model. An inversion technique is used to compensate for the dead-zone nonlinearity. New generic couch models are presented and applied to model the Elekta Precise Table™ dynamics and nonlinearities including dead zone. Couch deflection was measured for different manufacturers and found to be up to 25 mm. A feed-forward approach is proposed to compensate for such couch deflection. Simultaneous motion compensation for longitudinal, lateral and vertical motions was evaluated using arbitrary trajectories generated from sensors or loaded from files. Tracking errors were between 0.5 and 2 mm RMS. A dosimetric evaluation of the motion compensation was done using a sinusoidal waveform. No notable differences were observed between films obtained for a fixed- or motion-compensated target. Further dosimetric improvement could be made by combining gating, based on tracking error together with beam on/off time, and PSS compensation.</jats:p

Predictive tracking for respiratory induced motion compensation in adaptive radiotherapy

This paper considers a compensation strategy for respiratory-induced tumour motion for adaptive radiotherapy using a controlled patient support system (PSS). A model predictive control (MPC) scheme for the PSS to track the tumour motion is proposed together with two methods for predicting tumour motion, including a Kalman filter and neural networks. Simulation results using a clinical data set consisting of 27 traces of respiratory motion show the potential of the proposed control strategy. </jats:p

TREND LITERASI KESEHATAN MENTAL

Penelitian literasi kesehatan mental masih belum banyak dilakukan di Indonesia. Penelitian ini merupakan preliminary study yang bertujuan untuk mengetahui tingkat literasi kesehatan mental pada mahasiswa Indonesia. Penelitian ini menggunakan pendekatan kuantitatif dengan analisis deskriptif dan tidak menggeneralisasi suatu populasi wilayah tertentu. Sebanyak 501 mahasiswa dari berbagai provinsi terlibat dalam penelitian ini. Pengukuran mengadopsi alat ukur Mental Health Literacy dari Jung dkk. Hasil penelitian menunjukkan bahwa sebagian besar mahasiswa (54,1%) memiliki tingkat literasi kesehatan mental yang tinggi. Penelitian-penelitian sebelumnya menunjukkan bahwa tingkat literasi kesehatan mental dihubungkan dengan tingkat pendidikan dan usia. Lebih lanjut dalam penelitian ini, tidak terdapat perbedaan literasi kesehatan mental antara laki-laki dan perempuan. Penyebaran informasi terkait kesehatan mental sangat diperlukan melalui berbagai media untuk meningkatkan literasi kesehatan mental pada berbagai kalangan

TREND LITERASI KESEHATAN MENTAL

Penelitian literasi kesehatan mental masih belum banyak dilakukan di Indonesia. Penelitian ini merupakan preliminary study yang bertujuan untuk mengetahui tingkat literasi kesehatan mental pada mahasiswa Indonesia. Penelitian ini menggunakan pendekatan kuantitatif dengan analisis deskriptif dan tidak menggeneralisasi suatu populasi wilayah tertentu. Sebanyak 501 mahasiswa dari berbagai provinsi terlibat dalam penelitian ini. Pengukuran mengadopsi alat ukur Mental Health Literacy dari Jung dkk. Hasil penelitian menunjukkan bahwa sebagian besar mahasiswa (54,1%) memiliki tingkat literasi kesehatan mental yang tinggi. Penelitian-penelitian sebelumnya menunjukkan bahwa tingkat literasi kesehatan mental dihubungkan dengan tingkat pendidikan dan usia. Lebih lanjut dalam penelitian ini, tidak terdapat perbedaan literasi kesehatan mental antara laki-laki dan perempuan. Penyebaran informasi terkait kesehatan mental sangat diperlukan melalui berbagai media untuk meningkatkan literasi kesehatan mental pada berbagai kalangan

Evaluating the role of mosque as emergency shelter during natural disasters

Providing emergency shelter for the victims of natural disasters is part of disaster risk reduction (DRR) strategies. It is essential for the proper management of resources in the communities during emergency time. The approach toward providing emergency shelter to the victims varies in different contexts depending on the availability of suitable places. Organizations like IOM and FEMA have proposed a framework for appropriate planning and design of emergency shelters. These bodies also encourage local disaster management authorities in their guideline to utilize existing structures like schools, community centers, etc., as an emergency shelter for the victims. However, recent flood occurrence in India, UK, and Malaysia showed that the institution of the mosque is highly appropriate to be used as an emergency disaster shelter. This study analyzes the compatibility of mosque institution as a potential place for emergency shelter. The analysis follows the criteria set by IOM and FEMA to design properly functioning emergency shelter. Then, based on these criteria the design of common mosques is discussed considering different aspects such as location, capacity, and facilities. The institution of the mosque is also analyzed from the perspective of Islamic theology and how it is recommended for mosques to provide social and welfare services to the community. This paper recommends further study in this regard to proposing specific guidelines for the mosque so that it can be utilized as an existing structure for providing emergency shelter for disaster victims