Breathing-induced location uncertainties of internal structures are still a relevant issue in the radiation therapy of thoracic and abdominal tumours. Motion compensation approaches like gating or tumour tracking are usually driven by low-dimensional breathing signals, which are acquired in real-time during the treatment. These signals are only surrogates of the internal motion of target struct...

Real-time optical surface imaging systems offer a non-invasive way to monitor intra-fraction motion of a patient's thorax surface during radiotherapy treatments. Due to lack of point correspondence in dynamic surface acquisition, such systems cannot currently provide 3D motion tracking at specific surface landmarks, as available in optical technologies based on passive markers. We propose to ap...

24 The abdominal and rib cage contributions to tidal breathing differ between REM and NREM sleep. We 25 hypothesized that abdominal relative contribution during NREM and REM sleep would be altered in 26 different directions when comparing sleep on Earth with sleep in sustained microgravity (μG), due to 27 conformational changes and differences in coupling between the rib cage and the abdominal ...

24 The abdominal and rib cage contributions to tidal breathing differ between REM and NREM sleep. We 25 hypothesized that abdominal relative contribution during NREM and REM sleep would be altered in 26 different directions when comparing sleep on Earth with sleep in sustained microgravity (μG), due to 27 conformational changes and differences in coupling between the rib cage and the abdominal ...

Background Non-contrast MRA (NC-MRA) based on bSSFP and slab-selective inversion has become an attractive alternative for imaging renal arteries without the usage of potentially nephrotoxic contrast agent. It typically requires navigator gating or abdominal bellow triggering to alleviate breathing motion artifacts. However, navigator gating significantly complicates and lengthens exams due to i...

The aim of the present study was to clarify the effects of intervention by foot massage and abdominal breathing on insomnia and accessory symptoms. Eleven outpatients with insomnia and accessory symptoms, the subjects of the present study, were massaged on the foot for 15 minutes in the supine position on a bed. They were instructed to breathe abdominally for the first 5 minutes during the mass...

We studied the effect on breathing of a conventional and a newly designed abdominal binder in seven patients with complete tetraplegia. The indices of respiratory ability used were the transdiaphragmatic pressure on maximal sniff (sniff Pdi), the maximum static inspiratory mouth pressure (PImax), and the vital capacity (VC). These were measured in patients with and without binders, in the supin...

This study evaluated the breathing pattern of 30 obese patients [32 ± 9 years old; body mass index (BMI): 42.72 ± 4.10 kg/m(2)] before and after bariatric surgery and compared them with 30 control individuals (31 ± 8 years old, BMI: 21.99 ± 2.22 kg/m(2)). Measurements were performed using calibrated respiratory inductive plethysmography. Six months after bariatric surgery, obese patients exhibi...

We present a technique for registering information from preoperative CT or MR images to physical space using intraoperatively acquired 3-D ultrasound data and a surface-based statistical shape model. The model is subject-specific and captures the statistical modes of variation of the liver surface through the breathing cycle. The registration uses a Bayesian formulation, which enables informati...

Non-invasive surface registration methods have been developed to register and track breathing motions in a patient's abdomen and thorax. We evaluated several different registration methods, including marker tracking using a stereo camera, chessboard image projection, and abdominal point clouds. Our point cloud approach was based on a time-of-flight (ToF) sensor that tracked the abdominal surfac...