In the AAPM Report 80, the imaging modality of 4D CT and respiration-correlated CT was declared a "promising solution for obtaining high-quality CT data in the presence of respiratory motion". To gather anatomically correct data over time, the existence of correlation between the internal organ movement and an external surrogate has to be assumed. For the in-house evaluation of such correlation...

Respiratory motion is a major obstacle in radiation therapy of thoracic and abdominal tumors. Techniques to cope with it such as gating and tracking techniques are based on the use of breathing signals that can be acquired easily and in real-time. These signals represent only surrogates of the motion of the inner organs and tumors. Consequently, methods are needed to estimate respiratory motion...

When modeling covariate measurement error in regression, it is typically assumed that the measurement error acts in an additive or multiplicative manner on the true covariate value. However, such assumptions do not hold for the measurement error of sleep-disordered breathing (SDB). The true covariate is the severity of SDB, and the observed surrogate covariate is the number of breathing pauses ...

One presents the results of a study concerning the use of microwave Doppler transducer for contact-less detection of cardiorespiratory activity. The main element of the installation is a microwave Doppler transducer. The Doppler signal resulting from the movement of the anatomical structures is a complex one. The experimental setup also includes an electrocardiograph, a photopletismograph and a...

This paper describes the implementation of a Kalman Filter to separate heart rate and respiratory activity out of a signal that has been acquired by three different sensors in parallel. The different techniques of sensor fusion, signal extraction and signal shaping are merged into one single state space model. It can be demonstrated, assuming sine shaped signals for heart and breathing activity...

Respiratory mechanics models can be used to optimise patient-specific mechanical ventilation (MV), but are limited to fully sedated MV patients who are not spontaneously breathing. This research presents a non-invasive model-based method to determine respiratory mechanics of spontaneously breathing MV patients. Patient-specific respiratory mechanics of 22 spontaneously breathing patients are de...

background: using the method “surrogacy” in which a woman accepts to bear and deliver a child for a married couple is considered as a subsidiary method in infertility therapy. this method is relatively new in iran. objective: the purpose of this study was to evaluate the experiences of the women involved in surrogacy and to reveal some issues related to this method. materials and methods: the m...

This study aimed to compare combined audio-visual coaching with audio coaching alone and assess their respective impact on the reproducibility of external breathing motion and, one step further, on the internal lung tumor motion itself, through successive sessions. Thirteen patients with NSCLC were enrolled in this study. The tumor motion was assessed by three to four successive 4D CT sessions,...